endo-protocols

Case Study 001 — Core Restore liver cleanse with infrared sauna (no hormonal contraception)

📝 Status: Draft. Data is in, narrative populated, biomarker confirmation added, cycle-phase analysis complete, research cited. Ready for final voice-pass and publication.

💰 Affiliate disclosure: This post contains affiliate links to Core Restore (via Fullscript), WHOOP, Parsley Health, and SweatHouse. See disclosures.md for the full relationship breakdown.

⚠️ Not medical advice. n=1 personal tracking. If you have endometriosis or any chronic condition, decisions about diet, supplements, detoxification protocols, or hormonal medication should be made with qualified practitioners who know your history.

🔬 Part of the EndEndo.io ecosystem — root-cause case studies for people living with endometriosis.

🚺 No hormonal contraception or hormonal endometriosis suppression was used during the case-study window. This is critical context. See Methodology — concurrent medications and research/birth-control-context.md.

🛠️ Want to try this yourself? This case study is the foundation for the 30-Day Estrogen Clearance Protocol in this repo. The protocol generalizes what worked here. Three audience-specific entry points:

TL;DR

This is a within-subject case study of two cycles of the same Designs for Health Core Restore protocol at different durations: a 7-day cycle in June 2025 and a 14-day cycle in April 2026. Both cycles included infrared sauna sessions throughout as a complementary detoxification practice.

The 14-day cycle (Apr 2026), captured by WHOOP:

Marker Direction Magnitude
HRV ⬆⬆ Significant — the largest single signal
Recovery score ⬆⬆ Significant
Resting heart rate ⬇ Moderate
Sleep performance ⬆ Moderate
Sleep duration ⬆ Moderate
Respiratory rate → Stable

The 7-day cycle (June 2025), captured by Garmin VO₂ Max (no WHOOP at the time):

Marker Direction Magnitude
VO₂ Max ⬆⬆ The largest sustained 60-day rebound in my 3-year Garmin history, beginning at the cycle window
Durability of gains ⬆ Held in an elevated band for ~9 months

For someone with endometriosis — a disease driven by estrogen excess and systemic inflammation, both of which depend on liver clearance capacity — these aren’t vanity metrics. HRV is a validated non-invasive marker of systemic inflammation and vagal tone.1 VO₂ Max integrates cardiorespiratory fitness over weeks. A meaningful HRV improvement during the 14-day cycle plus a sustained VO₂ Max rebound during the 7-day cycle is the kind of multi-axis signal you’d expect if a protocol was reducing inflammatory load and improving recovery capacity.

The directions are real. What they prove is narrower than what they look like. This post covers what I did, what peer-reviewed research says about the mechanisms, what my data shows across both cycles, and the confounders I cannot rule out.

Why this matters for endometriosis — the science

This section is the research case for why a liver-focused protocol is a rational intervention for someone with endometriosis. Every claim links to a peer-reviewed source. If you want to go deeper, the full bibliography is at research.md.

1. Endometriosis is an estrogen-driven inflammatory disease

Endometriosis affects approximately 10% of women and people of reproductive age globally and is defined by ectopic endometrial tissue that is sustained by continuous estrogen exposure and drives chronic pelvic pain, infertility, and systemic inflammation (Zondervan et al., NEJM 2020).2 Ectopic lesions express local aromatase, producing their own estrogen in a positive feedback loop, which is why suppressing systemic estrogen remains a cornerstone of pharmacologic management (Bulun, NEJM 2009).3

2. The liver regulates how estrogen behaves in the body

Circulating estrogens are cleared almost entirely through hepatic metabolism, in two steps:

In people with endometriosis, altered expression of the sulfotransferase / sulfatase system has been documented specifically in endometriotic tissue (Piccinato et al., J Steroid Biochem Mol Biol 2016)5 — suggesting the liver-estrogen axis isn’t only systemic, it’s locally disrupted at the lesion level.

3. Environmental toxins matter because they share the same clearance machinery

Endometriosis has documented associations with elevated tissue levels of dioxins, PCBs, bisphenols, and phthalates — all lipid-soluble compounds that require the same Phase 1/Phase 2 pathways that clear estrogens (Porpora et al., Environ Health Perspect 2009;6 Smarr et al., Fertil Steril 20167). When the liver is simultaneously metabolizing environmental estrogen mimics AND endogenous estrogens, capacity gets exceeded and both accumulate. This is the mechanistic rationale for periodic “detox” protocols that reduce inbound toxicant load while upregulating Phase 2 capacity with targeted nutrients.

4. Reducing inflammatory load improves subjective and objective energy

Chronic inflammation — the kind that persists in endometriosis whether or not pain is active — impairs mitochondrial ATP production through oxidative and nitrosative stress pathways (Morris & Maes, Metab Brain Dis 2014).8 This is the mechanistic bridge between “my inflammation is lower” and “I feel more energetic.” It’s not placebo — it’s mitochondria getting a cleaner operating environment.

Heart rate variability (HRV) — the autonomic metric tracked by WHOOP — is a validated non-invasive proxy for both vagal tone and systemic inflammation (Thayer & Sternberg, Ann N Y Acad Sci 2006).1 When HRV rises during a protocol, it’s a direct signal that inflammatory load on the autonomic nervous system is dropping.

Women with endometriosis have been shown to have reduced baseline HRV compared to controls, independent of pain status (Kulshrestha et al., Indian J Physiol Pharmacol 2022).9 This is the missing piece that makes wearable-tracked endometriosis case studies scientifically coherent: there’s a real, documented baseline deficit; any intervention that measurably improves it is producing a signal worth examining.

5. What Core Restore targets, specifically

Core Restore is a 14-day functional medicine kit from Designs for Health. Its active ingredients map directly onto the pathways above:

Combined with an elimination diet (no gluten, dairy, soy, corn, eggs, sugar, alcohol, caffeine) that removes the most common inflammatory food triggers and — importantly — reduces glucoronidase-producing gut bacteria that can reactivate conjugated estrogens back into their free, bioactive form in the gut.

Read more in the comprehensive clinical review by Hodges & Minich (J Nutr Metab 2015).11

What I tried and why

I live with endometriosis. Anyone who’s done the reading knows that endometriosis is, among other things, an estrogen-driven inflammatory condition — and that the liver is where estrogen gets metabolized and cleared. When liver detoxification pathways get bottlenecked, circulating estrogen climbs, and so does the inflammation. That’s not fringe — it’s in the mainstream endo literature.

So when my functional medicine practitioner suggested Core Restore, I didn’t see it as a “cleanse” in the Instagram sense. I saw it as 14 days of deliberately reducing inbound load on my liver while supplementing the nutrients it actually needs to do Phase 2 conjugation — the chemistry that makes reactive metabolites water-soluble enough to excrete. Two very different framings, same protocol. Language matters.

I also wanted to know if it would actually do anything. I’ve been wearing a WHOOP since June 2025 (approx). If this protocol worked, my heart rate variability should move. HRV is the most sensitive non-invasive proxy for systemic inflammation and autonomic nervous system load that a consumer wearable can measure. If Core Restore was going to do something measurable, HRV would register it before I consciously noticed.

The 14-day structure appealed to me because I’m a neurodivergent person building a business. “Eat cleaner” is ambiguous — which my brain will not engage with. A structured protocol with a start date, an end date, and a clear rule set gives my nervous system a container to hold. I treated it as a 14-day experiment with a defined endpoint, not a lifestyle change.

The protocol in one paragraph

Core Restore is a 14-day functional-medicine detox kit from Designs for Health: a daily protein-and-fiber shake (morning + evening) plus a supplement stack (sulforaphane / glutathione precursors / milk thistle / curcumin / DIM) alongside a strict elimination diet — no gluten, dairy, soy, corn, eggs, sugar, alcohol, caffeine. I also incorporated infrared sauna sessions (SweatHouse) throughout the cycle as a complementary clearance practice — supporting elimination of lipid-soluble toxicants via sweat in parallel with the liver’s Phase 2 work. The goal is to reduce inbound load on the liver’s detoxification machinery while upregulating Phase 2 enzyme capacity with targeted nutrients and providing a secondary excretion pathway through skin. It’s dispensed through functional-medicine practitioners.

Why the liver

The liver is the body’s primary metabolic clearing house. Every hormone, drug, environmental toxin, and metabolic byproduct gets routed through two enzymatic phases — Phase 1 (cytochrome P450, which makes compounds more reactive) and Phase 2 (conjugation, which makes them water-soluble so you can excrete them). When Phase 1 is running hot but Phase 2 is bottlenecked, reactive intermediates accumulate and drive oxidative stress and systemic inflammation.

For people with endometriosis specifically, the liver is also responsible for estrogen metabolism. Impaired Phase 2 glucuronidation or sulfation → elevated circulating estrogens and reactive estrogen metabolites → well-documented worsening of endometriosis symptoms. This isn’t fringe — it’s in the mainstream endo literature. Protocols like Core Restore target Phase 2 support (glutathione precursors, sulforaphane, curcumin, milk thistle, DIM) alongside an elimination diet.

What a cleanse isn’t: it’s not squeezing toxins out of your organs. That framing is wrong, and it’s what makes mainstream medicine roll its eyes at the word. What it actually is: reducing inbound load (elimination diet) + upregulating Phase 2 enzyme capacity (supplements) + supporting binding and elimination (fiber + bile flow + sweat) for long enough that the system catches up.

The data — directional signal

Raw daily values live in data/daily-summary.csv for anyone who wants to audit the source data. The summary below preserves the direction and magnitude of each biomarker shift without exposing personal numeric ranges.

Phase comparison — Core Restore (14d) vs. pre-detox baseline

Marker Direction during Core Restore Magnitude Interpretation
Recovery score ⬆⬆ Significant Sustained autonomic improvement
HRV ⬆⬆ Significant — largest single signal Direct proxy for reduced inflammation + improved vagal tone
Resting HR ⬇ Moderate Consistent with reduced inflammatory burden
Sleep performance ⬆ Moderate Likely partly alcohol/caffeine elimination + HRV improvement
Sleep duration ⬆ Moderate Earlier bedtime as part of the protocol
Respiratory rate → Stable No meaningful change
REM sleep → Stable No meaningful change
Deep sleep → Stable No meaningful change

What the daily series looks like (qualitative summary)

A few patterns worth naming, observable in the raw daily-summary.csv:

To regenerate a phase comparison directly from the source CSV:

node scripts/analyze-phases.mjs \
  --data /tmp/whoop-raw.json \
  --config case-studies/001-core-restore-no-bc/phases.json \
  --detail 14

🧬 The integrative framework — liver-side AND microbiome-side estrogen clearance (hypothesis-generating)

This case study is built around a hypothesis-generating integrative thesis: that estrogen clearance in endometriosis depends on both liver Phase 2 capacity AND microbiome-mediated handling of cleared estrogens. The published research supports each leg separately. The case study does not directly measure whether the two interact in this particular author’s physiology.

What the published research establishes (well-supported):

What is biologically plausible but NOT directly measured in this case study:

The author’s vaginal microbiome data (Study 001 pilot data, May 2024 + November 2024 retest) shows approximately half of the community composition has β-glucuronidase or sulfatase enzymatic potential. A current Evvy retest during or after the April 2026 Core Restore is not part of this case study’s data, so whether the microbiome state shifted during the protocol is unknown.

The integrative thesis is therefore hypothesis-generating, not hypothesis-confirming, in this case study. It is grounded in published mechanism for each component. It motivates the broader citizen-science Study 001 cohort design (which IS structured to test the framework prospectively). For the full mechanistic walkthrough, the research-gap framing, and what future research would need to measure to confirm or falsify the integrative thesis, see microbiome-estrogen-axis.md.

Confirmatory blood work — directional summary

Two Quest Diagnostics blood panels bookend the case-study window: one in January 2026 (~2.5 months before the 14-day cycle, ~7 months after the 7-day cycle) and one April 23, 2026 (5 days after the 14-day cycle ended). The full directional breakdown is in biomarker-results.md.

The headline finding: the methylation cycle was visibly restored. Multiple markers in that pathway moved in the favorable direction during the window, and the single most mechanistically aligned marker — homocysteine — moved from above-reference into the normal range.

Marker Direction Mechanistic relevance to estrogen clearance
Homocysteine ⬇⬇ above range → within range The single most aligned biomarker for the protocol’s thesis. Homocysteine drop reflects restored methylation, which directly feeds COMT (the enzyme that methylates dangerous 4-OH estrogens to safer 2-MeO estrogens) and glutathione synthesis (Phase 2 conjugation).
Vitamin B12 ⬆ low-normal → mid-normal B12 is the cofactor for methionine synthase — bottleneck enzyme in the methylation cycle. B12 ⬆ + homocysteine ⬇ together = methylation cycle is functioning again.
Vitamin D ⬆⬆ low-optimal → solid optimal Modulates immune function, inflammatory cytokines, and aromatase expression. Documented therapeutic effect on endo pelvic pain in RCT data.12
hs-CRP (baseline only) Within optimal range — useful as a starting reference for future panels
TSH ⬇ slightly worse Slight elevation post-cycle. Likely cycle-phase confounded (TSH rises in late luteal phase) plus possible caffeine-elimination effect. Worth re-testing in follicular phase.

What this confirms biochemically: the protocol’s thesis is that supporting the methylation cycle improves liver Phase 2 capacity, which improves estrogen clearance, which reduces inflammation-driven endo symptoms. The homocysteine drop is direct evidence the methylation cycle responded. This is the kind of biomarker change that’s hard to handwave away.

Confounders I can’t rule out

This is the section most “cleanse” content skips. I can’t.

  1. Elimination diet is probably doing most of the work. Core Restore is multiple things at once: elimination diet + supplement stack + shake-based macro structure + concurrent infrared sauna. The diet alone (no gluten / dairy / soy / corn / eggs / sugar / alcohol / caffeine for 14 days) would probably produce a meaningful portion of the HRV gain by itself. The supplements may be additive. The sauna may be additive. The ratio of who’s doing what is not separable from this data.
  2. Alcohol abstention alone has a documented HRV effect. Even moderate drinkers often see meaningful HRV improvement within a week of abstention. I usually have a few drinks per week. That’s some of the signal, for sure.
  3. Caffeine elimination changes sleep. I’d normally have morning coffee. Removing it lengthens deep sleep and raises sleep performance, independent of the diet.
  4. Placebo is real and it doesn’t need apology. I knew I was on a protocol. Belief that something will help nudges autonomic metrics. That’s not fake — it’s also not a demerit. But it means I can’t attribute 100% of the HRV gain to enzyme support.
  5. Increased mindfulness. Just paying attention to food for 14 days changes things other than food — stress around meals, timing, satiety cues, sleep timing.
  6. Training load drifted. My strain averages varied across the 45-day window. I didn’t hold training constant as a control.

What I’d need to actually separate these: a longer n=1 with crossover (protocol → washout → elimination-only diet → washout → supplements-only), ideally 6+ months. That’s out of scope for a free case study but worth flagging as the real experimental design.

Menstrual cycle phase analysis — and why it strengthens the case

A key methodological note that needs to live in the case study itself, not buried in confounders:

Cycle phases during this window were confirmed two ways:

  1. Hormone testing: A January 2026 fasted-morning progesterone draw fell within the upper luteal-phase reference range, placing that draw firmly in mid-luteal phase (peak progesterone window).
  2. WHOOP physiological signature: Sharp drop in HRV + recovery, paired with elevated resting HR and skin temperature peak, signals approaching menses. This pattern appeared on January 24, 2026 and again on April 22–23, 2026 — placing both pre-menses transitions at the expected ~28-day interval.

Mapping the cycle calendar against the protocol window:

Phase Date range Estimated cycle days Cycle phase
Pre-detox baseline Mar 9 → Apr 4 Full cycle cross-section Mixed (cycle 2 end + cycle 3 start)
Core Restore (14 days) Apr 5 → Apr 18 ~cycle day 14 → 27 Ovulation + full luteal phase
Post-detox / lab day Apr 19 → Apr 23 ~cycle day 28 → menses Late luteal / menses transition

Why this strengthens the case — counterintuitively:

The 14-day Core Restore window happened almost entirely during the late follicular and luteal phase of the cycle. In a typical menstrual cycle, HRV is naturally suppressed during the luteal phase compared to the follicular phase — progesterone elevates resting heart rate, raises skin temperature, and reduces vagal tone.

So the protocol’s HRV improvement during the detox isn’t just a fitness effect happening on top of a static baseline. It happened during the cycle phase where HRV would naturally be lower. The protocol moved HRV upward against the downward pressure of luteal-phase physiology. If anything, the case study understates the protocol’s effect because it doesn’t normalize for cycle phase.

The post-detox HRV crash (Apr 22–23) is also explained: that’s late luteal / menses transition, where HRV naturally bottoms out. It’s not protocol withdrawal — it’s the cycle’s normal nadir.

Longitudinal extension — a within-subject dose-response observation

This April 2026 Core Restore is my second cycle of the same protocol. In June 2025 I ran Core Restore for 7 days — half the standard duration. The April 2026 cycle was the full 14 days. Same supplement stack, same elimination diet, same practitioner-supervised protocol, and infrared sauna incorporated throughout the 14 day cycle only — just twice the duration.

That makes this an unintentional but legitimate within-subject dose-response observation:

Did doubling the protocol duration produce a roughly proportional shift in autonomic markers, a diminishing-returns plateau, or a substantially different effect altogether?

The 2025 cycle predates my WHOOP ownership, so HRV-quality data isn’t available for that window. But Garmin tracks resting heart rate, body battery, sleep duration, and VO₂ Max continuously, and those metrics overlap with WHOOP’s. Merging the two sources gives a multi-year view of the same body across two doses of the same intervention.

Pipeline (reproducible)

# 1. Request Garmin export from Garmin Connect web → Account → Export Your Data
# 2. Parse the export to a daily CSV
node scripts/parse-garmin-export.mjs --export-dir <export-dir> --out /tmp/garmin-daily.csv
# 3. Merge with the WHOOP daily summary
node scripts/merge-longitudinal.mjs \
  --whoop case-studies/001-core-restore/data/daily-summary.csv \
  --garmin /tmp/garmin-daily.csv \
  --out case-studies/001-core-restore/data/longitudinal-summary.csv

The merged CSV preserves both sources with whoop_ and garmin_ prefixes — so when both wearables report the same metric (resting HR being the cleanest cross-source signal), the data can cross-validate, and when only one source covers a date range, the other’s columns are simply blank.

What three patterns might emerge

When the full Garmin data is in, the analysis will tell one of three stories:

  1. Linear dose-response. The 7-day cycle moved resting HR / body battery / sleep duration by some amount, and the 14-day cycle roughly doubled the shift. → Suggests duration matters, the protocol is on a productive curve, and longer cycles (or annual cadence) are likely worth the cost.
  2. Plateau effect. The 7-day cycle moved metrics nearly as much as the 14-day cycle. → Suggests the second week mostly maintains rather than extends gains. This would be a clinically valuable finding because most functional-medicine cleanse protocols default to 14 days; if 7 is enough for someone like me, that halves the cost and improves accessibility.
  3. No coherent signal in 2025. The 7-day cycle didn’t move Garmin metrics meaningfully. → Suggests either (a) duration matters in a non-linear way and 7 days is below threshold, (b) life confounders in summer 2025 swamped the effect, or (c) my Garmin metrics aren’t sensitive enough to detect a real change of that magnitude.

Early signal — Garmin VO₂ Max, May 2023 → April 2026

I pulled my monthly VO₂ Max series from Garmin Connect’s Reports export (3 years, 31 data points) ahead of the full daily-data export. The directional signal is strong enough to flag here even before the full daily data is in. Raw values in data/garmin-vo2max-monthly.csv for anyone who wants to audit.

Window VO₂ Max trend Notes
May–Sep 2023 Peak window 3-year peak — the band I want to return to
Oct 2023 → May 2025 ⬇ Steady decline 19-month decline
June 2025 ⬇⬇ Nadir The 7-day Core Restore happened in this window
July 2025 ⬆ First rebound First post-cycle reading
August 2025 ⬆⬆ Continued rebound Biggest 60-day rebound in the entire 3-year dataset
Sep 2025 → Mar 2026 → Plateau Gains held for ~9 months in a band I hadn’t touched since early-to-mid 2024
April 2026 → (lagging metric) During/just after the 14-day cycle. VO₂ Max updates lag — the full effect of the 14-day cycle won’t appear until May–July 2026 readings

What this preliminarily suggests: the 7-day cycle in June 2025 caught a 2-year decline at its nadir and was followed by the largest sustained VO₂ Max rebound of the entire 3-year window — and most of those gains held through to the next cycle. That’s a striking directional pattern, but it requires the named caveats below.

Confounders I cannot rule out from monthly VO₂ Max data alone:

Those caveats matter. They don’t erase the largest sustained 60-day rebound that hasn’t occurred at any other point in the 3-year series — but they constrain how strong a claim is appropriate.

What this means for the dose-response question: if the daily Garmin data shows a similar resting-HR / body-battery / sleep-duration pattern around the June 2025 cycle, the dose-response question shifts from “did 7 days do anything” to “did 7 days do most of what 14 days will do” — which is the plateau scenario above, the most clinically useful finding.

What durability would also look like

The ~9 months between the two cycles is its own observation window. If June 2025’s resting HR shift persisted into the 2026 baseline (i.e., my pre-detox baseline in 2026 is meaningfully better than my pre-2025-detox baseline), that’s evidence the 7-day cycle produced durable effects on top of any acute shift. If the 2026 baseline drifted back to the 2025 pre-detox level, the effect was transient.

The phase config at phases.json includes the 2025 long-baseline, the 7-day Core Restore window, the 10-month between-detoxes period, and the 14-day Apr 2026 cycle as separate phases for the comparison. Date ranges for the 2025 cycle are flagged ⚠️ pending confirmation of the exact start date.

What I’m choosing to do next

I’m keeping a handful of habits from the 14 days permanently. The morning protein-and-fiber shake (fiber binds bile and supports elimination — this was the piece of Core Restore with the cleanest mechanism). No alcohol during the workweek. A consistent earlier bedtime. Cruciferous vegetables every day for sulforaphane.

I’m continuing the infrared sauna (SweatHouse) cadence year-round — not just during detox cycles. Heat therapy has independent evidence for autonomic improvement, pelvic pain reduction in endometriosis, and lipid-soluble toxicant clearance via sweat. After incorporating it throughout the 14-day cycle and noticing how clean the post-sauna recovery scores looked, keeping the cadence going felt obvious.

I’m not keeping the supplement stack past the 14 days as a daily habit. Not because it didn’t help — the data suggests something did — but because I can’t attribute the effect to any single supplement without running them separately, and long-term daily use of some of these (DIM, sulforaphane extracts) isn’t well-studied. I may cycle them seasonally on my practitioner’s recommendation.

Next Core Restore cycle? My working plan is once every 6 months, timed to the start of a meaningful work cycle. The 14-day container is useful as a reset, not as a cure-all.

What this does NOT prove

If you’re curious about this kind of protocol, talk to a functional medicine practitioner who knows your history. Don’t just buy Core Restore and try it cold. Parsley Health is mine; there are others.

Resources

If you want to try Core Restore

You need a practitioner to dispense Designs for Health products through Fullscript or direct order. I wouldn’t recommend trying to source it yourself from a random retailer — the protocol assumes practitioner supervision, and the shakes and supplements are designed to work together.

If you want to track your own response with WHOOP

If you want a lower-barrier start

You don’t need a 14-day protocol to improve liver function. These are lower-risk, evidence-backed starting points:

Sauna therapy as a complement — what the research shows

This section is research-heavy on purpose. Sauna is one of the most-studied, highest-evidence non-pharmaceutical interventions in the chronic-disease literature, and it’s directly relevant to the same liver-inflammation axis this case study intervenes on. I incorporated infrared sauna sessions throughout the 14 day Core Restore cycle only because the research supports it as a parallel clearance route — and the personal experience of post-sauna recovery scores reinforced the choice.

1. Sweat is a real clearance route for lipid-soluble toxicants

The BUS (Blood, Urine, and Sweat) Study (Genuis et al., Arch Environ Contam Toxicol 2011) measured toxicant concentrations in matched samples from the same subjects and found that sweat is a clinically meaningful excretion route for a range of heavy metals and organic pollutants — in some cases at concentrations exceeding urine excretion.13

A follow-up systematic review specific to the four highest-concern heavy metals (arsenic, cadmium, lead, mercury) confirmed that sweat is a viable secondary elimination pathway, particularly in individuals with impaired renal clearance or high body burden (Sears et al., J Environ Public Health 2012).14

Why this matters for Core Restore: the protocol supports the liver’s Phase 2 conjugation pathways. Sauna adds a parallel clearance route via skin — particularly relevant for lipid-soluble compounds like bisphenols, phthalates, and PCBs that are elevated in women with endometriosis. The two interventions are genuinely complementary, which is why I ran them together.

2. Regular sauna use has documented cardiovascular and autonomic benefits

The landmark Finnish cohort study (n=2,315 men, 20-year follow-up) found a dose-response relationship between sauna frequency and both cardiovascular and all-cause mortality: 4–7 sessions/week was associated with roughly 50% lower cardiovascular mortality vs. 1 session/week (Laukkanen et al., JAMA Intern Med 2015).15 A comprehensive follow-up review covered the autonomic, metabolic, and cognitive mechanisms (Laukkanen et al., Mayo Clin Proc 2018).16

A systematic review of dry and infrared sauna across RCT and observational evidence found consistent benefits for chronic pain, fatigue, cardiovascular markers, and autonomic function (Hussain & Cohen, Evid Based Complement Alternat Med 2018).17

The mechanism most relevant to this case study: repeated heat exposure produces a sustained increase in vagal tone and HRV during the post-sauna recovery window. For someone with endometriosis — who starts from a reduced HRV baseline (Kulshrestha 2022)9 — this is exactly the direction you want to move.

3. Heat therapy has direct evidence for pelvic pain

An often-cited RCT found that continuous low-level topical heat was as effective as ibuprofen for dysmenorrhea (Akin et al., Obstet Gynecol 2001).18 While not all dysmenorrhea is endometriosis-related, the mechanism — pelvic floor muscle relaxation, local vasodilation, reduced sympathetic tone — is directly applicable.

A broader clinical review frames sauna as a valid adjunctive tool for autoimmune and chronic-inflammatory conditions, a category that overlaps substantially with endometriosis pathophysiology (Crinnion, Altern Med Rev 2011).19

4. Infrared vs. traditional (Finnish) sauna

The cited Finnish studies used traditional sauna (70–90°C dry heat). Infrared saunas operate at lower ambient temperatures (45–65°C) while still producing core temperature elevation and meaningful sweat volume. The toxicant-clearance evidence (Genuis 2011, Sears 2012) was collected partly in infrared sauna protocols. Both modalities appear to produce similar autonomic and clearance benefits at equivalent core-temp exposure.

My practice during this case study

I used the membership at SweatHouse in Denver — an infrared sauna studio — for three to four 30–45 minute sessions per week throughout the 14-day Core Restore cycle (and continue at the same cadence year-round). Sessions were typically after training. The post-sauna recovery scores were a consistent bright spot in the daily WHOOP data, which is part of why I’m continuing the cadence indefinitely.

For someone doing a structured detox protocol, a membership-based sauna is worth considering over one-off sessions. Cadence is what makes the biochemical and autonomic effects accrue — and memberships make cadence sustainable in a way that per-session pricing does not.

References

Full bibliography including additional references and PubMed search strings: research.md (case-study-specific) and ../../research/ (repo-wide consolidated literature).

Published: TK · Last updated: 2026-05-25 · Data window: 2026-03-09 → 2026-04-23 (45 days, plus Garmin VO₂ Max May 2023 → April 2026)

  1. Thayer JF, Sternberg E. “Beyond heart rate variability: vagal regulation of allostatic systems.” Ann N Y Acad Sci. 2006;1088:361-372. PMID: 17192580 ↩ ↩2

  2. Zondervan KT, Becker CM, Missmer SA. “Endometriosis.” N Engl J Med. 2020;382(13):1244-1256. PMID: 32212520 ↩

  3. Bulun SE. “Endometriosis.” N Engl J Med. 2009;360(3):268-279. PMID: 19144942 ↩

  4. Cavalieri EL, Rogan EG. “Depurinating estrogen-DNA adducts, generators of cancer initiation: their minimization leads to cancer prevention.” Clin Transl Med. 2016;5(1):12. PMID: 27060235 ↩

  5. Piccinato CA, Neme RM, Torres N, et al. “Effects of steroid hormone on estrogen sulfotransferase and on steroid sulfatase expression in endometriosis tissue and stromal cells.” J Steroid Biochem Mol Biol. 2016;158:117-126. PMID: 26773670 ↩

  6. Porpora MG, Medda E, Abballe A, et al. “Endometriosis and organochlorinated environmental pollutants: a case-control study on Italian women of reproductive age.” Environ Health Perspect. 2009;117(7):1070-1075. PMID: 19654914 ↩

  7. Smarr MM, Kannan K, Buck Louis GM. “Endocrine disrupting chemicals and endometriosis.” Fertil Steril. 2016;106(4):959-966. PMID: 27423382 ↩

  8. Morris G, Maes M. “Mitochondrial dysfunctions in myalgic encephalomyelitis / chronic fatigue syndrome explained by activated immuno-inflammatory, oxidative and nitrosative stress pathways.” Metab Brain Dis. 2014;29(1):19-36. PMID: 24557875 ↩

  9. Kulshrestha R, Pandey A, Jain A, et al. “Heart rate variability as a non-invasive marker of autonomic dysfunction in women with endometriosis.” Indian J Physiol Pharmacol. 2022;66(4):263-270. (Verify PMID against PubMed before publication.) ↩ ↩2

  10. Fahey JW, Zhang Y, Talalay P. “Broccoli sprouts: an exceptionally rich source of inducers of enzymes that protect against chemical carcinogens.” Proc Natl Acad Sci USA. 1997;94(19):10367-10372. PMID: 9294217 ↩

  11. Hodges RE, Minich DM. “Modulation of Metabolic Detoxification Pathways Using Foods and Food-Derived Components: A Scientific Review with Clinical Application.” J Nutr Metab. 2015;2015:760689. PMID: 26167297 ↩

  12. Mehdizadehkashi A, Rokhgireh S, Tahermanesh K, Eslahi N, Minaeian S, Samimi M. “The effect of vitamin D supplementation on chronic pelvic pain of patients with endometriosis: a randomized, double-blind, placebo-controlled trial.” Gynecol Endocrinol. 2021;37(7):640-645. (Verify PMID against PubMed before publication.) ↩

  13. Genuis SJ, Birkholz D, Rodushkin I, Beesoon S. “Blood, Urine, and Sweat (BUS) Study: Monitoring and Elimination of Bioaccumulated Toxicants Through Perspiration.” Arch Environ Contam Toxicol. 2011;61(2):344-357. PMID: 21057782 ↩

  14. Sears ME, Kerr KJ, Bray RI. “Arsenic, Cadmium, Lead, and Mercury in Sweat: A Systematic Review.” J Environ Public Health. 2012;2012:184745. PMID: 22505948 ↩

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