The Big Picture
Overall, the scientific evidence for supplements in endometriosis is limited. Most studies have been small, and a major 2025 analysis that pooled results from the highest-quality clinical trials found no clear benefit of supplements over placebo (a "sugar pill") for endometriosis pain. That said, a few specific supplements have shown some promise and are worth knowing about.
Vitamins C and E (Together)
This combination has the most encouraging, though still limited, evidence. Five clinical trials found that women taking vitamins C and E together reported less pelvic pain, period pain, and pain during intercourse compared to those taking a placebo. The antioxidant properties of these vitamins may help reduce inflammation linked to endometriosis. These vitamins are generally safe and inexpensive, but the studies were small, so more research is needed.
Vitamin D
Clinical trials have not shown that vitamin D supplements significantly reduce endometriosis pain compared to placebo. In one well-designed study of young women, vitamin D improved pain scores, but the placebo group improved by nearly the same amount. Vitamin D is still important for bone health and overall wellness, but it should not be relied upon specifically for endometriosis pain relief.
Omega-3 Fatty Acids (Fish Oil)
Fish oil supplements are popular for their anti-inflammatory effects, but the best clinical trial in endometriosis found that fish oil produced only modest pain improvement, comparable to what was seen in the placebo group. At this time, there is no strong evidence that fish oil helps endometriosis pain specifically.
N-Acetylcysteine (NAC)
NAC is an antioxidant supplement that showed promising results in one study. Women reported less pain and had smaller ovarian cysts after three months of use. However, this study did not include a placebo comparison group, which makes it hard to know whether the improvements were truly due to NAC. More rigorous research is needed before NAC can be recommended.
Curcumin (Turmeric Extract)
One recent clinical trial tested a specialized form of curcumin (nanocurcumin) added to a standard hormonal medication (dienogest). Women who took both had significantly less pain than those on the hormonal medication alone. This is encouraging, but curcumin has not been tested on its own against a placebo, and the specialized formulation used in the study may differ from over-the-counter turmeric supplements.
PEA (Palmitoylethanolamide)
PEA is a naturally occurring fatty substance that has shown some pain-reducing effects in small studies of women with endometriosis-related pelvic pain. However, the quality of these studies has been questioned, and larger, more rigorous trials are needed.
Important Things to Keep in Mind
- Supplements are not a substitute for proven treatments. Hormonal therapies, pain medications, and surgery remain the most evidence-based options for managing endometriosis.
- "Natural" does not always mean safe or effective. Supplements are not regulated as strictly as prescription medications, so quality and dosing can vary between brands.
- The placebo effect is real. In many of the above studies, women taking a placebo also experienced meaningful pain improvement. This does not mean the pain is "in your head". It reflects the complex nature of pain and the power of expectation.
- Every person is different. What works for one person may not work for another. If you are interested in trying a supplement, discuss it with your healthcare provider so it can be integrated safely into your overall care plan.
The Bottom Line
While some supplements, particularly vitamins C and E, show early promise for endometriosis management, the overall evidence is not yet strong enough for any supplement to be recommended as a standard treatment. The best approach is to work closely with your healthcare team to find a treatment plan that is right for you, and to discuss any supplements you are considering.