Nutrafol vs Viviscal has no proven winner. Choose Nutrafol Women if you want a vegan, iron-free formula and can take four capsules daily. Choose Viviscal if you prefer two tablets and can take marine-derived collagen, oyster extract and 20 mg of iron. Both have positive studies. No trial compared them directly, so separate results can’t rank them.
This is a desk comparison, not a product test. It covers the standard women’s products on their U.S. maker pages and labels, checked on November 8, 2026. Men’s, postpartum and menopause formulas differ.
Nutrafol vs Viviscal at a glance
| Decision point | Nutrafol Women | Viviscal Hair Growth Supplement |
|---|---|---|
| Daily label formula | Vitamin A 1,500 mcg RAE; vitamin C 40 mg; vitamin D3 62.5 mcg; vitamin E 3.5 mg; vitamin K2 50 mcg; vitamin B12 120 mcg; iodine 225 mcg; zinc 25 mg; selenium 200 mcg; Synergen Plant Complex 1,110 mg (ashwagandha, saw palmetto, Moldavian dragonhead, turmeric, palm extract, hyaluronic acid); Nutrafol Bio-Blend 490 mg (chlorella, pea sprout, L-cysteine, L-lysine, beet, B. subtilis DE111 at 1 billion CFU, bamboo, cayenne) | Vitamin C 118 mg; niacin 24 mg NE; biotin 240 mcg; calcium 120 mg; iron 20 mg; zinc 22 mg; AminoMar Marine Complex 1,072 mg with type II collagen and oyster extract; horsetail 73 mg; millet seed extract 15 mg |
| Routine | Four capsules once daily with a meal | One tablet twice daily with food and water |
| Dietary fit | Vegan, biotin-free and iron-free; contains several plant extracts | Not vegetarian or vegan; contains marine and oyster-derived ingredients plus iron |
| Maker’s published claim | Faster-growing, thicker, fuller and stronger hair, with visible results in 3–6 months | Visible improvement in growth and thickness in as little as three months; the maker gives a 3–6 month course |
| Closest evidence | Positive current-generation studies, but no placebo-controlled trial found for the exact posted 2026 formula | A positive 90-day placebo-controlled trial of Viviscal Extra Strength with a similar core formula; exact identity with today’s label is unverified |
| Main checks before use | Pregnancy, medicines, thyroid history and total intake of zinc, selenium and iodine | Pregnancy, medicines, fish or shellfish allergy, iron status and total intake of iron and zinc |
The formula row gives the maker’s daily amounts. It doesn’t prove that each ingredient grows hair. Blend totals hide each plant’s dose.
Has any trial compared Nutrafol with Viviscal?
No. Zhou, Zhu and Chen’s 2026 network review included 19 trials and 1,658 people with pattern hair loss. Most evidence compared a supplement with placebo, not another supplement. The authors rated several results as low certainty because studies were small, varied and indirect.
The studies used different formulas, groups, timelines and scalp measures. A higher rank from indirect data is not a head-to-head win. Drake and colleagues reached a similar conclusion in their 2023 JAMA Dermatology review. Both products showed possible benefit, but larger trials against another treatment are needed.
What the Nutrafol studies show
Dang and colleagues tested the newer Nutrafol Women Advanced Formula in 2026. This is the formula now sold as Nutrafol Women. Forty-five women received it within a four-group study. At 180 days, measured hair growth rose by 0.04 mm per 24 hours, or 22.4%, from baseline. Terminal hair counts and scalp coverage also rose.
The study was open-label, had no placebo group and was funded by Nutrafol’s maker. Normal changes and expectations could explain part of the result. A 2024 study of the same formula had 95 completers and found gains from baseline, but it had no placebo either.
An older 2018 trial by Ablon and Kogan provides a better control. It randomized 40 women with self-perceived thinning to the original Nutrafol formula or placebo for six months. The 26 women taking Nutrafol had greater terminal and vellus hair counts at days 90 and 180. Yet that original formula contained marine collagen and other ingredients replaced in today’s vegan version. It supports the former formula, not a guaranteed result from the current one.
What the Viviscal study shows
Ablon’s 2015 trial assigned 60 women with self-reported temporary thinning at random. Thirty took Viviscal Extra Strength twice daily and 30 took placebo for 90 days. The Viviscal group gained more terminal hairs in a marked 4 cm² scalp area. They also shed fewer hairs in a set wash test. The trial reported no adverse events.
The design is stronger than an uncontrolled study, but it remains small and short. Lifes2good, Viviscal’s maker at the time, funded it. The tested product used the same core ingredient family: AminoMar, horsetail, acerola, biotin and zinc. The paper does not establish that every amount matches the current U.S. label.
So Viviscal has cleaner placebo-controlled evidence for a close formula. That still doesn’t prove it works better than current Nutrafol.
How long should results take?
Three months is the earliest fair checkpoint for either product. Viviscal’s controlled trial measured a difference at day 90. Nutrafol studies measured changes at days 90 and 180. Both makers publish a 3–6 month window.
Ignore promises of a change in days or two weeks. Hair grows slowly, and bathroom shedding can vary from wash to wash. Use the same part, lighting, distance and dry-hair state for baseline photos. If the front hairline is your concern, the hairline photo check can set a consistent visual baseline. A photo cannot diagnose the cause or prove that a supplement worked.
Safety matters more than the brand name
“Drug-free” doesn’t mean risk-free. Both products contain several nutrients at once. Guo and Katta’s 2017 review found weak support for single nutrients when tests show no deficiency. It also explains that excess iron, zinc or selenium can cause harm. Too much selenium can itself cause hair loss.
Don’t stack either product with another hair gummy or multivitamin without totaling the labels. Nutrafol already supplies 25 mg of zinc and 200 mcg of selenium daily. Viviscal supplies 20 mg of iron and 22 mg of zinc. Its iron makes it a poor default when tests don’t show low iron. If low stores are plausible, use a blood test and the evidence on low ferritin and hair loss instead of guessing.
Current Nutrafol Women is biotin-free. Viviscal contains 240 mcg of biotin daily, which can distort some blood-test results. Tell your doctor and the lab what you take before testing. Both makers say these formulas aren’t intended during pregnancy or nursing. Viviscal’s oyster extract rules it out for vegans and calls for care with shellfish allergy.
Nutrafol’s 2026 four-formula study recorded 29 possibly or probably related events among 180 women. Most were mild; stomach upset and acne were the most common. Six events occurred in the 45-person Advanced Formula group. One moderate thyroid event was judged possibly related. That signal needs context, but it shouldn’t be hidden.
Which one should you choose?
- Name the problem first. A supplement for thinning won’t repair snapped shafts. Use the shedding versus breakage guide if you aren’t sure what you’re seeing.
- Remove the obvious mismatch. Choose neither without medical advice during pregnancy, with relevant medicines, or when a label ingredient conflicts with an allergy or condition.
- Pick by formula, not marketing. Nutrafol fits a vegan, iron-free preference. Viviscal fits someone comfortable with marine ingredients, iron and twice-daily tablets. Don’t choose Viviscal as treatment for suspected iron deficiency.
- Set a six-month decision point. Record the same scalp view at baseline and monthly. Stop judging by one shower or one photo. Review side effects and visible change with your doctor.
A supplement shouldn’t delay a diagnosis. See a GP or dermatologist first for sudden loss, smooth bald patches, scalp pain, marked redness, scale, scarring or eyebrow loss. The same applies to heavy shedding after illness, weight change or a new medicine. Persistent part widening or recession also deserves a diagnosis. For pattern hair loss, the evidence comparison between Nutrafol and minoxidil shows why a supplement and a studied treatment are different decisions.
If those warning signs are absent, the choice is practical. Nutrafol suits the vegan, iron-free reader who accepts four capsules and weaker exact-formula evidence. Viviscal suits the reader who accepts marine ingredients and iron, and values a small placebo-controlled trial of a close formula. A doctor should make the call when the cause is unclear, nutrients may be low, medicines may interact, or hair loss is progressing.
Oscar Nascimento
Editorial writer, GlowUp Face
Oscar writes about evidence-based skin care, healthcare, looksmaxxing, and the social and economic research surrounding appearance.
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