Vitamins for Skin, Hair, and Nails: What Can a Supplement Claim?

By BLUVITAL · Content last reviewed on October 10, 2026

You're looking at a supplement for skin, hair, and nails. Collagen appears on the front of the package, alongside something about vitamin C, zinc, or biotin. It reads like one story, but the wording may refer to different ingredients. Which nutrient does each claim apply to? And what does that tell you as a buyer?

This guide helps you tell those statements apart, with a claims table, an explanation of the percentages on the label, and five steps you can use with any brand. BLUVITAL sells The Gold Reserve. This information comes from a brand with a commercial interest. We use our own formula as an example you can check.

Do the claims apply to collagen or to the added nutrients?

An authorized health claim applies to a specific nutrient and has conditions of use. In a collagen supplement containing vitamin C, zinc, or biotin, it must remain clear which ingredient the claim refers to. A claim for that vitamin or mineral is not an authorized health claim for the added collagen.

An amount on a label and a statement about health tell you different things. The number of milligrams describes the product's composition. A health claim describes a relationship between a nutrient and health. European rules govern these claims. A brand must respect both the authorized meaning and the conditions attached to it.

The Netherlands Food and Consumer Product Safety Authority (NVWA) explains that there are no authorized health claims for collagen (in Dutch). If collagen appears on a package, read on to find the nutrient named in the claim. For more on its source and the distinction between collagen as a protein and a supplement, see our guide to marine collagen.

What can you say about vitamin C?

The authorized skin claim for vitamin C reads: Vitamin C contributes to normal collagen formation for the normal function of skin. This statement concerns the role of vitamin C. The words collagen formation do not make it a claim for the collagen added to a supplement.

The distinction may look small on paper, but it matters. The words normal function do not promise a visible change, shallower wrinkles, or results within a set number of weeks. The claim also does not mean that you have a deficiency or need a supplement.

Check that vitamin C is clearly the nutrient the sentence refers to. An image, headline, or standalone slogan must not turn that explanation into a promise about the entire formula. The claim may only be used if the product meets the conditions for being a source of vitamin C.

Which claims apply to zinc and biotin?

Zinc and biotin are often mentioned together in connection with skin, hair, and nails. Their authorized claims are not the same. Zinc has separate claims for the maintenance of normal skin, normal hair, and normal nails. Of these three areas, biotin has claims for skin and hair, not nails.

Zinc: skin, hair, and nails

Zinc is a mineral. Its authorized claims concern the maintenance of normal skin, normal hair, and normal nails. They do not promise that taking extra zinc will resolve hair loss or repair brittle nails. The word normal is part of the claim's meaning; leaving it out can change what a reader expects.

Biotin: skin and hair

Biotin is a vitamin, also known as vitamin B8 in the Netherlands. When it is combined with zinc, zinc's claims do not automatically apply to biotin. Look for the nutrient named in each sentence. This helps you spot when a broad phrase such as “skin, hair, and nails” suggests more than the individual claims allow.

On a small screen, scroll the tables sideways to read all the columns.

The amounts were read from the packaging; the claim wording appears in Regulation (EU) No 432/2012. For every row, the claim is only permitted if the product is at least a source of that nutrient. The amount, daily serving, and overall presentation must also be accurate. This table does not rank ingredients or recommend taking more.

What does Reference Intake mean on the label?

Reference Intake, abbreviated RI, is a standardized value used for labeling. The percentage shows how the amount of a vitamin or mineral compares with that value. It is not a personal assessment of your needs or a score for a supplement's quality or effectiveness.

For example, the European RI for biotin is 50 micrograms. A serving containing 450 micrograms therefore provides 900% RI: 450 divided by 50, multiplied by 100. That does not mean nine times the benefit. And 100% RI is not a safety limit. Limits for safe intake are a separate matter.

Check the unit, too. One milligram equals one thousand micrograms, so comparing numbers without their units tells you little. Then check whether the table gives amounts per tablet, per shot, or per recommended daily serving. If you take several supplements, compare their labels side by side to see where ingredients overlap.

The Netherlands Nutrition Centre explains how to read RI values (in Dutch). For most people, a varied diet provides enough nutrients. Some groups have specific recommendations for supplementation; a general beauty claim does not tell you whether a recommendation applies to you.

How should you read the other vitamins and minerals on the label?

Read the entries that receive less attention on the front of the package, too. Note the name, amount, and unit. Keep a description of an ingredient separate from a statement about its effects. The presence of several nutrients does not, by itself, establish an additional effect from combining them.

Vitamin A: don't assume the form

The name vitamin A does not automatically tell you which form a product contains. For that, you need to read the ingredient list or product specification. Nor does the name justify a comparison with a retinol cream: a food supplement and a skin care product have different uses. For this overview, the listed vitamin and its amount are enough. The warnings on the label remain just as important as the numbers.

D3 and K2

D3 and K2 identify forms of vitamin D and vitamin K, respectively. Check that these forms are actually listed, along with the amounts per daily serving. Having two vitamins in one formula does not prove that you need extra amounts of both. It does not give the product a claim about hormones, menopause, or skin rejuvenation, either. If you take medication, follow the product warnings.

B5 and selenium

Vitamin B5 and selenium are different nutrients: B5 is a vitamin, while selenium is a mineral. Again, start with the amount and unit. Selenium has its own authorized claims, but these cannot be applied to B5 or to the entire formula. This additional overview is limited to what the product contains, without attaching a new promise of results.

How can you check a claim in practice?

You do not need to memorize every authorized sentence. Take the label and work through these five steps. You can apply the same check to BLUVITAL and any other brand.

1. Write down the claim. Is it about what the product contains, a health function, or a promised result? Look at the headline and nearby image, too. They can leave a different impression from the fine print.
2. Find the nutrient it applies to. Does the skin claim name vitamin C, zinc, or biotin? Is that name still clear in the sentence? An ingredient featured prominently on the front is not necessarily the nutrient behind the claim.
3. Check the official claim and its conditions. Look up the nutrient in the European list. Compare the meaning and read the conditions of use. A reference to research or a positive review alone does not authorize a health claim.
4. Use the recommended daily serving. Check the amount, unit, and RI percentage. Add together multiple tablets if that is what the serving requires. Do not compare the numbers as though a higher percentage automatically means a better product.
5. Read the directions and warnings before you choose. Check allergens, who should not use the product, and any overlap with other supplements. An authorized claim does not make a product suitable for everyone. If you are unsure about combining it with medication, speak with your doctor or pharmacist.

If you then want to compare the full composition, our label guide also covers source, product format, and price per serving. Keep the central question specific: which nutrient does this statement apply to, in what amount, and under which conditions?

Sources and transparency. This article draws on the European list of authorized health claims, the European framework for nutrition and health claims, the NVWA and RI guidance linked above, and the Netherlands Nutrition Centre's information on food supplements (in Dutch). Product amounts were checked against photographs of the physical packaging. Every health claim in this article remains tied to its specific nutrient.