Endometriosis: The Evidence-Based Supplement Protocol

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Endometriosis is driven by ectopic endometrial tissue, chronic inflammation, and (in many cases) estrogen-dependent growth. Hormonal therapy (combined OCPs, progestin IUDs, GnRH analogues) and surgical excision remain the strongest interventions. Supplements have a defined role as adjuncts targeting the inflammatory and oxidative-stress components.

Curcumin (Bioavailable Form), 500–1,000 mg Daily

Curcumin reduces ectopic endometrial-cell proliferation in vitro and modulates the inflammatory cascade implicated in endometriosis pain. A 2018 RCT in 60 women with endometriosis showed bioavailable curcumin reduced pain VAS and serum hsCRP versus placebo. Use a bioavailable form (Meriva, Theracurmin, or with piperine). See curcumin absorption piece.

N-Acetylcysteine (NAC), 1,200–1,800 mg Daily

A 2013 Italian RCT in 92 women with endometriotic cysts compared NAC 1,800 mg three days per week versus placebo over 3 months. The NAC arm showed cyst size reductions and was associated with fewer planned surgical interventions. The signal is intriguing and biologically plausible (glutathione precursor reduces oxidative stress in pelvic tissues) but the trial design has been criticized. Replication trials ongoing. See our NAC overview.

EPA-Dominant Omega-3, 2 g EPA Daily

Omega-3 supplementation has modest evidence in dysmenorrhea (which overlaps strongly with endometriosis) and reduces inflammatory cytokine production. A 2013 Italian RCT showed reduced pelvic pain and inflammatory markers at 2 g EPA + DHA daily over 6 months. See our omega-3 form piece.

Vitamin D — Repletion to 30–50 ng/mL

Vitamin D deficiency is more common in endometriosis cohorts than controls in cross-sectional data, and repletion is associated with reduced pain scores in observational follow-up. Replete to target serum level; ongoing 2,000–4,000 IU daily for most patients. See vitamin D piece.

Resveratrol, 500 mg Daily — Emerging

A 2013 Italian RCT showed resveratrol added to ethinyl estradiol/drospirenone reduced pelvic pain in women with endometriosis. The trial was small and resveratrol's bioavailability is poor at oral dose, so the result is not yet clinically actionable. See our resveratrol limitations piece.

What NOT to Take

Avoid soy isoflavones at high dose — phytoestrogens may worsen estrogen-dependent endometriosis (though dietary soy is fine). Skip "estrogen detox" formulas — pharmacologically incoherent. Avoid DHEA — converts to androgens that may aromatize. Don't replace hormonal management or surgical care with supplements alone. Avoid stacking NAC with nitroglycerin (vasodilator interaction).

How to Run the Protocol

Hormonal management (combined OCP or progestin) plus excision surgery where indicated remain primary. Layer curcumin 500 mg + omega-3 2 g + vitamin D to repletion daily. Add NAC 1,800 mg three days per week as an experimental adjunct in women with ovarian endometriotic cysts. Re-evaluate pain VAS and quality-of-life at 12 weeks. See condition page and the related PCOS stack.