Nutrafol vs Viviscal for PCOS Hair Loss: Ingredients and Evidence Compared

Is Nutrafol or Viviscal Better for PCOS Hair Loss?

Neither capsule has been tested in anyone diagnosed with PCOS — now renamed polyendocrine metabolic ovarian syndrome (PMOS) after a 2026 global consensus published in The Lancet involving more than 50 organisations. Same condition, same mechanism, only the label changed; here is exactly what that rename did and did not change. This article uses PCOS because that is still what people search.

Both companies have run their own randomised trials, in general populations of adult women with self-perceived thinning hair, and both beat placebo on hair-count measures. Whether either product does anything for the androgen-driven thinning specific to PCOS is a separate question, never tested by either trial, and the gap between the two questions is where this comparison actually lives. If your hair loss follows the diffuse, crown-and-part-line pattern of androgen-driven thinning, read PCOS hair loss: the pattern, the cause, and what regrows it first — this page compares two cosmetic hair-thickening products against each other, not against a medical treatment.

What Is Actually in Each Capsule?

Four capsules of Nutrafol’s core women’s formula supply a proprietary “Synergen Complex” built around saw palmetto extract, ashwagandha, hydrolyzed marine collagen and turmeric extract, alongside standard biotin, vitamin D3, zinc and selenium. Two tablets of Viviscal Extra Strength — one in the morning, one in the evening — supply “AminoMar,” a marine-protein complex sourced from shark cartilage and oyster extract powder, plus vitamin C, niacin, biotin, iron and zinc. Exact per-ingredient milligram amounts are printed on each product’s current label and are worth reading yourself, since formulas are updated over time.

Nutrafol is the one brand in this comparison with a genuinely independent quality mark: it holds NSF Certified for Sport and NSF Contents Certified status, the same banned-substance and label-accuracy screening used by Major League Baseball. How that kind of certification actually works, and what it does not prove, is worth reading before you assume a certified label means a proven effect — it verifies what is in the bottle, not whether the bottle does anything. Viviscal’s current packaging and manufacturer materials do not show an equivalent mark; check the box in your hand, since certifications and formulas both change.

What the Clinical Trials Actually Found

Nutrafol’s own six-month trial enrolled 26 women on active treatment against 14 on placebo and found a significant increase in terminal and vellus hair counts at day 90 and day 180 (Ablon & Kogan, 2018, p < 0.009), plus investigator-rated improvements in hair growth (p = 0.016) and hair quality (p = 0.005). Viviscal’s three-month trial enrolled 30 women per arm and found a significant increase in terminal hair count (p < 0.0001) and a reduction in hair shedding (p = 0.002) against placebo (Ablon, 2015).

Neither trial recruited anyone with a PCOS diagnosis. Viviscal’s enrolment criteria named “poor diet, stress, hormonal influences, or abnormal menstrual cycles” as causes among its participants — a category PCOS can sit inside, but the trial did not test for it or report it separately. Both trials were run by, or in direct collaboration with, the company selling the product, which is standard practice in this product category and does not invalidate the numbers — but it is a reason to weigh the independent reviews below more heavily than either company’s own press materials do.

Does Either Product Address What Actually Drives Hair Loss in PCOS?

Not directly. PCOS-related hair thinning is driven by elevated free androgens acting on genetically susceptible follicles — the same underlying mechanism as ordinary female pattern hair loss, with a hormonal accelerant layered on top. Saw palmetto, Nutrafol’s headline “DHT-inhibiting” ingredient, works as a mild 5-alpha-reductase inhibitor at food-supplement doses. Viviscal contains no androgen-related ingredient at all.

For a sense of how weak that mechanism is in practice, a Cochrane review of 47 trials and 5,290 women with female pattern hair loss found that finasteride 1 mg — an oral anti-androgen with a far stronger 5-alpha-reductase-inhibiting effect than saw palmetto — was no more effective than placebo (risk ratio 0.95). Topical minoxidil was the one intervention with solid trial evidence, increasing total hair count by 13.18 hairs per cm² against placebo across eight trials and 1,242 women. Neither Nutrafol nor Viviscal was among the interventions this review found strong evidence for.

If bloodwork confirms elevated free androgens, that finding is worth discussing with a clinician directly, including whether an anti-androgen such as spironolactone fits your wider PCOS management — but be realistic there too. The trial evidence for spironolactone’s effect on hair regrowth specifically, as opposed to acne and excess facial hair, is thinner than most people assume, and the same Cochrane review calls for exactly those trials to be run.

What Independent Reviews Found

Two systematic reviews not funded by either company have pooled this whole product category, and their verdict lands somewhere more measured than either manufacturer’s own trial suggests.

A 2023 JAMA Dermatology review of 30 studies found “potential benefit” for Viviscal, Nutrafol and several other named nutraceuticals on hair-related outcomes, but rated the underlying evidence low to moderate quality and called for larger trials with active comparators. A 2026 meta-analysis of 14 trials and 967 people, covering both products by name, found statistically significant improvements in anagen hair density, telogen hair density and pull-test results — but no significant difference in total hair count (p = 0.06). Patient-reported satisfaction was consistently higher with active treatment across every trial pooled.

Hair Growth Supplements for PCOS: The Wider Category

Nutrafol and Viviscal are the two best-studied brands sold as hair growth supplements for PCOS, but they are not the only ingredients marketed this way. Biotin is added to nearly every hair supplement on the shelf, and a 2017 review of the biotin-hair evidence found the case for it rests almost entirely on case reports in people with a diagnosed biotin deficiency or an inherited biotin-processing disorder — a small group. If bloodwork has not flagged a deficiency, extra biotin has no demonstrated hair-growth benefit, and high doses can interfere with certain thyroid and cardiac lab assays, which is worth mentioning before you get blood drawn.

Saw palmetto sold on its own, outside a proprietary blend, has even less trial data behind it in women specifically than it does inside Nutrafol’s formula. Treat any “PCOS hair loss supplement” that is not one of the two brands above as carrying less evidence than either, not more, however the label reads.

Who This Will Not Work For

If you want proof either product treats PCOS, that trial has not been run — not by the manufacturers, and not independently. If you need a fast result, both flagship trials measured their earliest effect at 90 days by design, because a hair follicle’s growth cycle does not move faster than that no matter what you take. If bloodwork has already confirmed high free androgens and that is the problem you are trying to solve, a monthly proprietary blend is not positioned to move that number the way a conversation about anti-androgen treatment with your clinician is. And if cost is the deciding factor, Nutrafol’s subscription price runs well above Viviscal’s typical per-bottle price for a similarly sized body of company-sponsored evidence — the independent reviews above rated the two similarly, so price, and whether you would rather take four capsules or two tablets a day, are reasonable tie-breakers.

Price and Where to Check

At the time of writing, Nutrafol’s Women’s core formula is sold on subscription at roughly $70 a month at the discounted recurring rate on the company’s own site, before tax or shipping. Viviscal Extra Strength is sold per bottle rather than by subscription, at a price that has consistently run below Nutrafol’s monthly cost at major US retailers. Prices move, differ across the US, UK, Australia and Canada, and shift with promotions — check the retailer directly rather than trusting a number printed anywhere, including this page.

Disclosure: PCOSguides earns affiliate commission on some product links elsewhere on this site. There are none in this article — every figure above is a description, not a link, because neither product’s evidence cleared the bar this site sets before recommending a purchase. Full affiliate disclosure.

Your next step

Neither capsule is a PCOS treatment, and neither is worthless — they are two similarly evidenced cosmetic products for general thinning hair, one with independent testing behind it and one without. If elevated androgens are confirmed on a lab panel, spend the conversation with your clinician on that number before spending the subscription fee. More comparisons like this one live in the full evidence-ranked guide to PCOS products.