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Pure Vitamins UK Biotin, Zinc and Selenium tablets supporting normal nails and hair health

Splitting Nails: What Actually Supports Normal Nails?

by Dr. Miron in News

Reviewed and updated: 24 July 2026

Splitting nails are usually about everyday wear and tear rather than a vitamin deficiency, so protecting them comes first, and where diet has a genuine role it is zinc and selenium that contribute to the maintenance of normal nails. This is an honest look at what really supports normal nails, what the science actually shows about biotin, how much to take, and when a nail change is worth a doctor rather than a supplement.

Pure Vitamins UK Biotin, Zinc and Selenium tablets for hair, skin and nails

TL;DR: what supports normal nails

  • Most splits are external: water, detergents, polish remover and repeated wetting and drying.
  • The nail nutrients: zinc and selenium both contribute to the maintenance of normal nails.
  • Biotin and nails: biotin is a friend to normal hair and skin; its nail evidence is limited to deficiency.
  • Realistic: a supplement supports normal maintenance where diet is short, it does not repair external damage.
  • See a GP for sudden colour, shape or separation changes, and respect the zinc and selenium upper limits.

The most common causes of splitting nails are everyday ones

Before you reach for a supplement, it helps to know that the most frequent reasons nails split are external: frequent hand-washing, detergents and cleaning products, nail polish remover, and simple repeated wetting and drying that weakens the nail plate. Honestly, gloves for washing-up, a gentler nail-care routine and moisturising the nail and cuticle often do more than anything in a bottle. Get those basics right first.

The nutrients that genuinely support normal nails

Two minerals have a real, recognised role in keeping nails normal:

  • Zinc contributes to the maintenance of normal nails, and also to normal skin and normal hair.
  • Selenium contributes to the maintenance of normal hair and normal nails.

Both sit in our Biotin, Zinc & Selenium tablet, alongside biotin for its hair and skin roles. So if your diet may run low in these minerals, a supplement is a sensible way to support the nails you already have, rather than a fix for damage.

What about biotin and nails?

Biotin gets marketed hard for hair and nails, so let me be straight with you. A systematic review found that in the reported cases where biotin helped hair or nail changes, the people involved had an underlying deficiency or a specific condition, and it concluded there is a lack of good evidence for biotin in otherwise healthy people (Patel et al., 2017, DOI). Biotin genuinely supports normal hair and skin, which is why it earns its place in the formula, but for nails specifically the honest pointer is zinc and selenium. That is not a knock on biotin, it is just matching the nutrient to the job.

Pure Vitamins Biotin, Zinc and Selenium tablets bottle for hair, skin and nail health

What a supplement can and cannot do

Here is the honest framing. If splitting nails are partly down to gaps in your diet, supporting normal nail maintenance with zinc and selenium is reasonable. But if the cause is external, which is the common case, or a health issue, a supplement will not fix it and is never a substitute for addressing the real cause. Think of it as supporting normal maintenance, not repairing a problem. Nails also grow slowly, so any nutritional support shows over months, not days.

How much, and the upper limits

More is not better with these minerals, and both have upper limits worth respecting:

  • Zinc: EFSA sets a tolerable upper intake level of about 25 mg per day from all sources; sustained high zinc can interfere with copper status, which is why a sensible dose matters. We explain it in what zinc does for skin and nails.
  • Selenium: the upper level is around 300 micrograms per day; selenium has a relatively narrow window, so a modest amount is the goal.
  • Biotin: no upper limit is set, as it is water-soluble, which we cover in is biotin water-soluble.

Biotin and blood tests: a practical caution

One genuinely useful thing to know: high-dose biotin can interfere with some laboratory blood tests that use a streptavidin-biotin system, including certain hormone and thyroid assays, and the effect depends on the dose and the time since your last capsule (Ostrowska et al., 2019, DOI). If you take a high-strength biotin supplement, tell the clinic before a blood test so they can read your results correctly.

When to see a professional

Some nail changes deserve a doctor's eye rather than a supplement: sudden changes in colour or shape, pitting, separation from the nail bed, or splitting that appears alongside other symptoms. These can occasionally signal something worth checking, so please do not self-manage them with supplements, see your GP.

Food sources and signs of running low

Zinc is found in meat, shellfish (oysters especially), seeds, nuts and wholegrains; selenium is rich in Brazil nuts, fish, eggs and wholegrains. Low zinc can show as poor wound healing, skin changes or hair shedding, though these overlap with many things and are a prompt to look at your diet rather than a diagnosis. A varied diet supplies most people, with a supplement quietly filling any gaps.

Pure Vitamins Biotin, Zinc and Selenium supplement for hair, skin and nails

A sensible approach to nail strength

  • Protect them: gloves for wet work, gentler nail-care, moisturise the nail and cuticle.
  • Cover the nutrient bases: zinc and selenium for the maintenance of normal nails, if your diet may be short.
  • Be patient: nails grow slowly, so any nutritional support shows over months.
  • Check persistent changes: with a GP, not a supplement label.

How our Biotin, Zinc & Selenium is formulated

Our Biotin, Zinc & Selenium tablet brings together zinc and selenium for normal nails with biotin for normal hair and skin, in one daily tablet. It is formulated in the UK and tested for purity and heavy metals at our GMP-certified facility. For the wider picture see our hair, skin and nails guide and how much biotin you need, or browse the full range on the Pure Vitamins UK home page.

Frequently asked questions

What actually supports normal nails?

Zinc and selenium both contribute to the maintenance of normal nails. For everyday splitting, protecting nails from water and detergents usually matters more than any single nutrient.

Does biotin help splitting nails?

Biotin supports normal hair and skin, and the evidence for nails is limited to cases of deficiency. In healthy people there is insufficient evidence that biotin improves nails, so for nails the honest pointers are zinc and selenium.

How much zinc and selenium is safe?

EFSA upper levels are about 25 mg a day for zinc and around 300 micrograms a day for selenium from all sources. Stay within sensible amounts, as both can cause problems in excess.

Should I tell my doctor I take biotin before a blood test?

Yes. High-dose biotin can interfere with some laboratory blood tests, so let the clinic know so they can interpret your results correctly.

Sources retrieved from PubMed; see linked DOIs above. This article is for general information, not medical advice. Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle. Persistent or sudden nail changes should be assessed by your GP. If you are pregnant, breastfeeding, taking medication or managing a medical condition, speak to your GP or pharmacist before starting a new supplement. Signed, Dr. Miron, Founder of Pure Vitamins UK.

Tags: Biotin Hair Skin Nails Nail Care Tips Nail Health Nails Nutritional Support Selenium Splitting Nails Zinc Zinc and Selenium
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Which is better, B12 or biotin?

Reviewed and updated: 28 July 2026 If you are asking which is better, B12 or biotin, the honest answer is that neither one wins, because they are not really competing for the same job. Vitamin B12 and biotin are both B vitamins, but they look after different parts of your body, so the right question is not which is stronger, it is which one fits what you are trying to support, and whether you might actually benefit from both. B12 or biotin: the short version I am Dr. Miron, Founder of Pure Vitamins UK, and this is the comparison I get asked about more than almost any other. People see biotin marketed for hair and B12 marketed for energy, assume they overlap, and try to pick a winner. They do not overlap much at all. Biotin is best known for its role in maintaining normal hair and skin, while B12 is the one your body leans on for normal red blood cell formation, a normal nervous system, and reducing tiredness and fatigue. Choose based on your goal, not on which sounds more powerful. The quick answer, at a glance What they are: both are water-soluble B vitamins your body cannot store in large amounts, so a steady daily intake matters. Reach for biotin if: your focus is hair and skin, or you want support for normal energy-yielding metabolism and macronutrient metabolism. Reach for B12 if: your focus is everyday energy, the nervous system and red blood cells, especially if you eat little or no animal food. Can you take both? Yes. They are complementary B vitamins with no reason to compete, and many people sensibly take both. The one catch: very high-strength biotin can interfere with some blood tests, so mention it to whoever takes your bloods. What biotin actually does Biotin, sometimes called vitamin B7, is a coenzyme your body uses to help turn the food you eat into usable energy. In the language of the GB nutrition and health claims register, biotin contributes to normal macronutrient metabolism, normal energy-yielding metabolism, the normal functioning of the nervous system, normal psychological function, and the maintenance of normal hair and normal skin. That hair and skin role is exactly why biotin ended up on every beauty shelf. Here is the part the marketing tends to skip. The research on biotin for hair is genuinely useful, but it is honest about its limits. A systematic review of biotin for hair loss found that improvement was seen in people who had an underlying biotin deficiency or a specific condition, and concluded there is a lack of good evidence that supplementing helps people who are not deficient (Patel, Swink and Castelo-Soccio, 2017, https://doi.org/10.1159/000462981). 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A few honest scenarios help: You want to support your hair and skin routine: biotin is the natural fit, ideally alongside a varied diet. See our honest take on biotin versus collagen for beauty if you are weighing those two as well. You feel persistently tired and eat little animal food: B12 is the more logical starting point, and worth a conversation with your GP. You are covering general nutrition: both appear together in most B-complex and multivitamin formulas for good reason, and you can read how we think about that in our best vitamins for hair, skin and nails guide and the wider supplement guides hub. Can you take B12 and biotin together? Yes, and there is no clash. They are both B vitamins, they act on different pathways, and neither blocks the other. Plenty of people take a dedicated biotin for hair and skin and a separate B12 for energy and dietary cover, or simply take a B-complex that includes both. If you prefer to keep things targeted, you can pair our high-strength biotin tablets with a vitamin B12 supplement and take them at whatever time suits your routine, since consistency matters far more than timing. How much of each do you need? For labelling in the UK, the nutrient reference value, or NRV, is 50 micrograms for biotin and 2.5 micrograms for B12. Those NRVs are the baseline a normal diet aims to cover, not a ceiling. Everyday adequate intakes are modest: EFSA sets an adequate intake for biotin around 40 micrograms a day, and the UK reference nutrient intake for B12 is roughly 1.5 micrograms a day for adults. Supplements often sit well above those figures, which is normal for water-soluble B vitamins. A 10,000 microgram biotin tablet, for example, provides a very high multiple of the NRV, and a B12 supplement is frequently dosed high to account for the fact that only a fraction is absorbed at once. Neither biotin nor B12 has a formal tolerable upper intake level set, largely because they are water-soluble and surplus amounts are mostly excreted rather than stored. That does not mean more is automatically better, and for biotin in particular there is a specific reason to be thoughtful about very high doses, which I will come to next. If you want the detail on strengths, our guide to how much biotin you actually need lays it out. The one thing to know before a blood test This is the part most hair-and-energy articles leave out, and it genuinely matters. High-strength biotin can interfere with some laboratory blood tests. Many common tests use biotin-based technology, and when there is a lot of biotin in your bloodstream it can push certain results falsely high or falsely low. A review of this problem lists thyroid tests, troponin (a heart marker), and hormone and vitamin tests among those that can be affected, and notes the interference tends to appear at higher intakes (Moerman and Delanghe, 2020, https://doi.org/10.1080/17843286.2020.1780770). The practical takeaway is simple and reassuring. If you take a high-strength biotin, tell whoever is arranging your blood tests, and it is commonly suggested to pause biotin for a couple of days beforehand so your results are read accurately. This is also a neat reason the two vitamins connect: biotin can distort some of the very markers used around B12 and thyroid testing, so honesty with your clinician keeps the picture clean. Signs your levels might be low Frank biotin deficiency is uncommon in people eating a normal varied diet, because biotin is widespread in food and also made by gut bacteria. When it does occur it can show up as thinning hair, skin changes and brittleness. B12 shortfall is more common, especially with a plant-based diet or with age, and can show as unusual tiredness, a pale or washed-out look, pins and needles, or low mood. None of this is something to self-assess from a blog, so if symptoms are persistent, a GP and a blood test are the sensible route. Where to get them from food Food first is always my starting point. Biotin is found in eggs (especially the yolk), nuts, seeds, oily fish, sweet potatoes and wholegrains. B12 is almost entirely found in animal foods such as meat, fish, eggs and dairy, plus fortified foods like some plant milks and breakfast cereals. That single difference explains a lot: it is much easier to fall short on B12 on a vegan diet than on biotin, which is one of the clearest cases where a supplement earns its place. How to choose and take them well When you are comparing products, look past the front of the label. 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If your levels are already fine, topping up further is unlikely to transform anything, and that is true for both biotin and B12. Supplements support a good diet and lifestyle, they do not replace them, and the most honest promise any brand can make is a clean, well-labelled product that helps you cover your bases. A few cautions worth knowing If you are pregnant, breastfeeding, or managing a health condition, check with a healthcare professional before starting a new high-strength supplement. Tell whoever arranges your blood tests that you take biotin, as high-strength biotin can affect some results. Persistent tiredness, tingling or hair changes deserve a proper look from your GP rather than guesswork. Stick to the stated dose on the label unless a professional advises otherwise. Frequently asked questions Is B12 or biotin better for energy? 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High-strength biotin can interfere with some laboratory immunoassays and shift certain results, so it is best to tell your clinician you take it and, where advised, pause it for a day or two before testing. Which should I choose if I am vegan? B12 is usually the priority for anyone on a vegan or largely plant-based diet, because it is found almost entirely in animal foods. Biotin is more widely available from plant foods, so shortfalls are less common. Shop High-Strength Biotin Tablets Warmly,Dr. Miron, Founder of Pure Vitamins UK This article is for general information and education. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle, and this is not medical advice. If you have symptoms or a health condition, speak to your GP or a qualified healthcare professional.

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