What do PCOS supplements actually do? What the research shows

The evidence doesn't support any single supplement as a treatment for PCOS, and most of the individual ingredients marketed for it have only low- or very-low-certainty evidence behind them. A handful of nutrients — inositol, omega-3, vitamin D, chromium and N-acetylcysteine (NAC) — have shown effects on specific metabolic or hormonal markers in randomized trials, mostly with moderate certainty at best, and berberine's human data is small and inconsistent.

What the evidence doesn't support

It doesn't support treating PCOS with a supplement instead of medical care — PCOS is a diagnosed hormonal condition, and no supplement reviewed here is established as a treatment for it. It doesn't support the idea that one "PCOS stack" addresses every symptom; the research below is organized by ingredient because each has been tested for different, narrower outcomes — some for insulin measures, some for cycle regularity, some for cholesterol — not for PCOS as a whole. And it doesn't support most of these ingredients at high confidence: a 2023 umbrella review of 28 meta-analyses covering PCOS nutrition research found no high-certainty evidence that any dietary or supplement intervention improved health or reproductive outcomes in PCOS, and most individual findings were rated low or very low certainty.

What the trials found

That 2023 umbrella review is the most complete map available of where the PCOS supplement evidence actually stands. It found moderate-to-high certainty evidence that probiotics or synbiotics reduced fasting glucose, fasting insulin and insulin resistance (HOMA-IR), and moderate certainty that they reduced total testosterone. It found moderate certainty evidence that fish oil (omega-3) reduced fasting insulin and HOMA-IR and raised adiponectin (a hormone linked to insulin sensitivity), and that omega-3 separately lowered triglycerides. It found moderate certainty for vitamin D and for inositol improving fasting insulin, and moderate certainty that inositol increased ovulation rates in subfertile women with PCOS. Curcumin showed moderate-certainty reductions in fasting glucose, fasting insulin and HOMA-IR. Across the 40 outcomes assessed, though, the reviewers found no high-certainty evidence for any nutritional intervention on PCOS.

A separate 2025 network meta-analysis of 79 randomized trials (n=5,501) compared several supplements against each other and against placebo. It found chromium associated with the largest gains in follicle-stimulating hormone and total antioxidant capacity, plus the largest drop in VLDL cholesterol; soy isoflavones with the largest gain in glutathione and drop in a marker of oxidative stress (malondialdehyde); inositol with the largest drop in total cholesterol and triglycerides; curcumin with the largest change in LDL and HDL cholesterol; and omega-3 with the largest drop in a measure of insulin resistance (HOMA-IR). The same analysis found no significant differences between any supplement and placebo for total testosterone, sex-hormone-binding globulin, DHEA, a marker of inflammation (hs-CRP), or nitric oxide — several commonly marketed "hormone-balancing" outcomes among them.

NAC has two meta-analyses with different emphases. A 2025 meta-analysis of 22 studies (n=2,515) found NAC increased progesterone and endometrial thickness compared with placebo, with no significant change in estradiol, SHBG or FSH. A 2023 meta-analysis of 11 randomized trials (n=869) found NAC lowered fasting blood glucose and total cholesterol compared with placebo, with no significant change in BMI, body weight, fasting insulin or triglycerides. Berberine's human PCOS data is smaller and more mixed than these: see our dedicated review of berberine and PCOS research for the specifics, including a meta-analysis that found insufficient data to draw a conclusion about berberine's effect on insulin resistance in PCOS.

Ingredient	Outcomes with evidence	Certainty
Probiotics/synbiotics	Reduced fasting glucose, fasting insulin, HOMA-IR, total testosterone	Moderate to high
Omega-3 (fish oil)	Reduced fasting insulin, HOMA-IR, triglycerides; higher adiponectin	Moderate to high
Vitamin D	Reduced fasting insulin	Moderate
Inositol	Reduced fasting insulin; higher ovulation rate (subfertile women); reduced total cholesterol/triglycerides (network meta-analysis)	Moderate
Curcumin	Reduced fasting glucose, fasting insulin, HOMA-IR; LDL/HDL changes	Moderate
Chromium	Higher FSH, higher total antioxidant capacity, reduced VLDL	Reported as most effective option in a network meta-analysis; not separately graded for certainty
NAC	Higher progesterone, endometrial thickness (one review); reduced fasting glucose, total cholesterol (another review)	Not separately graded; reviews conflict on which outcomes moved
Berberine	Mixed and limited — see dedicated review	Low; one meta-analysis called the data insufficient

Questions people ask

What supplements help PCOS?

None are established treatments for PCOS itself, but several have randomized-trial evidence for specific markers: probiotics and omega-3 for insulin-related measures, vitamin D and inositol for fasting insulin, curcumin for glucose and insulin measures, and NAC for a smaller, more mixed set of hormone and metabolic outcomes. The certainty behind most of these findings is moderate at best, and a 2023 umbrella review found no high-certainty evidence for any of them.

Do PCOS supplements help with weight?

Weight itself isn't the most consistent signal in this research — most of the higher-certainty findings above are about insulin, glucose, lipid or hormone markers, not body weight directly. Where weight or BMI was measured, results were generally smaller and less consistent than the metabolic-marker findings.

What supplements help with PCOS hair loss or acne?

None of the reviews summarized here measured hair loss or acne as an outcome. The hormone changes some supplements produced — lower testosterone with probiotics, for instance — are markers connected to those symptoms in PCOS generally, but that's different from a trial that measured hair or skin directly.

Are PCOS supplements safe to combine?

The trials behind these findings mostly tested one ingredient at a time, not combinations, so combining several doesn't carry the same evidence as any one ingredient alone. Some of these ingredients, including NAC and high-dose fish oil, can interact with medications or affect bleeding risk — talk to a doctor before combining supplements, especially alongside any prescription medication.

Can I take PCOS supplements while trying to conceive?

Some of the trials reviewed here, particularly on inositol and ovulation, were conducted in women with PCOS and infertility, so that population is represented in the research. That's different from a blanket safety judgment for pregnancy itself — if you are pregnant or actively trying to conceive, talk to a doctor before starting any new supplement.

When to talk to a doctor

PCOS is a diagnosed hormonal condition, and none of the supplements reviewed here are established treatments for it — they're nutrients and compounds studied for effects on specific markers, with certainty that ranges from moderate to very low. Diagnosis, monitoring for related conditions like insulin resistance, and any treatment plan belong with a doctor. If you are pregnant, trying to conceive, or taking a prescription medication, talk to a doctor before starting any of the supplements discussed here.

Related reading: does myo-inositol help with PCOS? what the research does and doesn't show and does berberine help with PCOS? what the research does and doesn't show.