Review · Nails and skin

SupraNail review: what is actually in the capsule, and what the nail research says

SupraNail is a capsule you swallow, sold online as support for healthy nails and feet. We pieced the label together, searched PubMed for nail research on each ingredient and read the refund policy line by line. The gap between the marketing and the evidence is wide.

By Grant Whitaker, Editor · Updated October 23, 2026 · 13 studies checked on PubMed

What SupraNail is

SupraNail is an oral dietary supplement in capsule form. The bottle images on the official site show 60 capsules per bottle and the front label reads "Promotes healthy nails and feet." It is sold only through the official website, with checkout handled by Digistore24, as a one-time purchase with no subscription. The site does not name the company behind it.

We are noting the format because other nail products we have reviewed, such as Kerassentials, NanoDefense Pro and TerraCalm, are liquids or creams applied to the nail or skin. SupraNail is swallowed, and its label shares no ingredients with any of them. The questions it raises are different: what does a blend of fiber and laxative herbs have to do with nails, and is it safe to take every day?

The label: what we could and could not read

The sales page does not show a Supplement Facts panel. The only view of the label is the edge of it on the bottle renders, where most of each line is cut off. From those images we could make out a "Proprietary" blend whose ingredient lines begin with oat bran, a domestica species (prune), a purshiana species (cascara sagrada), a line ending in "cathartica", senna, a fruit powder, rhubarb, Euterpe (acai) and fennel, followed by "Other ingredients" starting with magnesium. The serving size line is not legible, and no individual amounts are visible.

The sales page tells a somewhat different story. It describes "13 in 1" support, then "a group of 11" ingredients, and names Senna auriculata, oat bran, acai, licorice root, pumpkin seed, cayenne, fennel, prune juice extract, green tea, hops, vitamins C and E and cascara sagrada. Rhubarb appears on the visible label but not on the sales page. Licorice, cayenne, green tea, hops and the vitamins appear on the sales page but we could not confirm them on the label. We also could not tell which senna is used: Senna auriculata, named on the sales page, is a different plant from the senna sold as a laxative.

When the product page and the label disagree, and neither shows doses, a reader cannot know what a daily serving contains. That is the main reason for the low transparency score.

The formula next to the research

For each ingredient we looked for human trials on nail strength, growth or appearance. Here is what we found.

We did not find a single human study of any of these ingredients on nails. That is unusual even by the standards of this category, because there are nail supplements with some trial data. They just are not in SupraNail.

What the nail supplement research actually covers

Nails are made of keratin and grow slowly. A review in Clinics in Dermatology notes that a fingernail grows about 2 to 3 mm a month and takes 6 to 9 months to replace itself completely, and that nearly any nutritional deficiency can show up in the nails ^[1]. So nail changes can be a sign of something worth checking with a doctor.

For brittle nails, a 2020 expert review found that the main supplements with reported benefit are biotin, some trace elements and amino acids such as cysteine ^[3]. A review focused on biotin found that small trials reported firmer, harder and thicker brittle nails, but called for larger controlled trials ^[4]. In an open-label study, 25 adults with brittle nails took 2.5 g of specific collagen peptides daily for 24 weeks; nail growth rose 12% and broken nails fell 42%, with no placebo group for comparison ^[5]. A 2025 review of nail supplements listed biotin, collagen peptides, keratin, MSM and stabilized silicic acid as the ingredients with clinical data, and pointed out that makers are not required to test efficacy before selling ^[2].

None of those ingredients is on the SupraNail label or sales page. The formula is built mostly from fiber and plants traditionally used to move the bowels, which have no known pathway to the nail.

What the marketing claims vs. what we could verify

The main sales page promises "incredible results in record time." The video pages and affiliate materials go much further, with a headline about a "7 second" ritual that clears nails "3X faster" and copy about removing fungus from inside the body. The promotional emails supplied to affiliates claim nail fungus can spread to the bloodstream within 30 days and cite unnamed Harvard, MIT and Cambridge researchers.

We could not trace any of these claims to a published study. The site's own reference page lists links on aloe vera, horsetail, flaxseed, psyllium, acidophilus and lemon, none of which appears among the SupraNail ingredients we could identify, and several links go to blogs rather than research. The "Nutrafix" add-on is described as working "against internal fungus buildup" by raising nitric oxide; we found no study supporting that either. For the record, no supplement is a substitute for diagnosis, and Stark Verve does not suggest that SupraNail or any ingredient in it treats a nail infection.

The sales page also says this is "the very last time" the product will be available, while the video page runs a 30-minute countdown timer. We treat both as sales pressure, not information.

How this compares with what a doctor can offer

For confirmed toenail fungal infections there is solid research on prescription options. A Cochrane review of 48 trials with 10,200 participants found high-quality evidence that oral terbinafine and azole antifungals clear the infection far more often than placebo ^[6]. Prescription topical lacquers and solutions (amorolfine, ciclopirox, tavaborole and efinaconazole) also produced results in mild to moderate cases when applied daily for 24 to 48 weeks ^[7]. These are medicines with side effects and interactions, which is why a clinician chooses among them, but they have the evidence that SupraNail lacks.

For men with diabetes, a 2025 review notes that nail fungal infections are more common and more severe, and can raise the risk of bacterial infection and ulcers, so early diagnosis matters ^[8]. Not every thick or discolored nail is fungal, either; injury, psoriasis and other conditions can look similar. A short visit can save months of guessing.

Price, packages and refund policy

Prices on the official site when we checked:

• 4 bottles of SupraNail plus 2 bottles of SupraNail NutraFix: $294 total ($59 per SupraNail bottle and $29 per NutraFix bottle), free US shipping, two ebooks.
• 2 bottles plus 1 NutraFix: $177 total ($69 and $39), free US shipping, two ebooks.
• 1 bottle: $79, plus a small shipping fee.

The site does not state how many capsules to take a day. The supply lengths in the box below assume two capsules a day from a 60-capsule bottle, which is common but which we could not confirm.

The refund terms need a careful read. The sales page FAQ promises a 60-day money-back guarantee "if you are not happy." The separate refund policy page says full refunds apply to "unopened items" returned within 60 days of delivery, minus shipping fees, that all items must be sent back, and that return postage is on you. The FAQ and the refund page also give two different Florida return addresses. Given that a fingernail takes six months or more to grow out ^[1], 60 days is too short to judge any nail product, and an unopened-only policy may not help someone who tried it. Confirm the terms in writing with the seller before ordering.

Safety

Because the doses are hidden, we cannot say how strong any of these ingredients is in a serving. That uncertainty is itself a safety issue for a product meant to be taken every day.

• Stimulant laxative herbs. Senna and cascara work by making the bowel contract. A 2024 review of 43 publications found no convincing evidence that stimulant laxatives damage the gut at normal doses ^[9], but they are meant to treat constipation, not to be taken for nails. Cramping and loose stools are expected effects, and ongoing diarrhea can lower potassium, which matters if you take diuretics or heart medicines such as digoxin. A published case report linked cascara sagrada to serious cholestatic liver injury ^[10].
• Licorice. If the licorice listed on the sales page contains glycyrrhizin, it can raise blood pressure. A meta-analysis of 8 randomized trials (541 people) found glycyrrhizin-based products raised systolic pressure by about 3.5 mmHg ^[12]. In healthy volunteers given graded doses for four weeks, the higher doses caused hypertension, low potassium and swelling in some people ^[11]. Men with high blood pressure, heart or kidney disease should be cautious.
• Green tea. A US Pharmacopeia review linked concentrated green tea extracts to rare liver injury, with case reports at EGCG intakes from about 140 mg a day, and advises taking them with food ^[13]. We do not know how much SupraNail contains.

Talk to your doctor before starting SupraNail, especially if you take any prescription medication, have liver, kidney, heart or bowel problems, or have diabetes. Stop and seek care if you notice abdominal pain, dark urine, yellowing of the skin or eyes, or persistent diarrhea. Results vary, and new or worsening nail or foot symptoms deserve medical attention.

What we liked and what gave us pause

Frequently asked questions

Is SupraNail a pill or something I apply?

It is an oral capsule. The bottle shows 60 capsules and is labeled as a dietary supplement.

Will SupraNail get rid of nail fungus?

We found no evidence that it will, and it is sold as a dietary supplement, which cannot legally claim to treat a disease. If you think you have a nail infection, see a doctor or podiatrist; prescription treatments have strong trial evidence.

Will it upset my stomach?

It may. Several ingredients are traditional laxatives. Because the amounts are not disclosed, we cannot predict how strong the effect will be.

Where can I buy SupraNail?

Only on the official website, according to the seller. It is not sold in stores or on Amazon.

How long before I would notice anything?

Results vary. Nails grow slowly, so any change in the nail plate takes months to show, well beyond the 60-day refund window.

How we reviewed SupraNail

We read the official sales page, the video page, the refund policy, the site's reference list and the affiliate terms. The full Supplement Facts panel is not published, so we read what was legible on the bottle images and compared it with the sales page. We then searched PubMed for human nail research on each ingredient and for safety data on the ones that raised concerns. We did not test the product on people, and nobody at Stark Verve is a medical professional. Read our editorial policy to learn how we choose and update reviews. Stark Verve earns a commission if you buy through our links; that never changes what we write about the evidence.