Biotin is one of the most popular supplements for hair — but does it actually work? Here’s the honest answer: biotin genuinely contributes to the maintenance of normal hair, skin and mucous membranes, and a deficiency can cause hair thinning. For people who are low in biotin, topping up can make a real difference; for those who already get enough, the evidence for dramatic hair growth is weaker.
This guide explains what biotin does, what the science shows, why we pair it with zinc and selenium, and how to take it.
Quick answer: Biotin supports normal hair and skin and is most impactful if you’re running low. Pairing it with zinc and selenium — which also support hair and nails — gives broader support than biotin alone.
What is biotin?
Biotin (vitamin B7) is a water-soluble B vitamin. As well as hair and skin, biotin contributes to normal macronutrient metabolism (turning food into energy), to the normal functioning of the nervous system, and to normal psychological function.
Biotin for hair, skin & nails: what the evidence says
Biotin contributes to the maintenance of normal hair and normal skin — these are authorised health claims. The nuance is around growth: the clearest benefits are seen in people with a biotin shortfall, where supplementing can restore normal hair and nail health. If you already have adequate biotin, the case for extra biotin dramatically boosting growth is less certain. We think it’s fair to be upfront about that rather than over-promise.
Why we add zinc & selenium
Hair, skin and nail health depends on more than one nutrient, which is why our formula isn’t biotin alone. Zinc contributes to the maintenance of normal hair, skin and nails. Selenium contributes to the maintenance of normal hair and normal nails. Combining all three gives more complete support than a single-ingredient biotin tablet.
| Nutrient | Contributes to |
|---|---|
| Biotin | Normal hair, normal skin, energy metabolism, nervous-system function |
| Zinc | Maintenance of normal hair, skin and nails |
| Selenium | Maintenance of normal hair and nails |
How much biotin should you take?
Biotin is water-soluble and well tolerated. High-strength supplements provide large amounts (such as 10,000 µg) because biotin has a wide safety margin, though more isn’t automatically better. Take it consistently — hair and nail changes are gradual and typically take months to show.
Important: High-dose biotin can interfere with some laboratory blood tests (including thyroid and heart tests). If you’re having blood work done, tell your doctor you take biotin.
Biotin 10,000µg with Zinc & Selenium — 120 Capsules
High-strength biotin plus zinc and selenium for hair, skin and nails. Zero fillers, UK-made.
View Biotin →Frequently asked questions
Does biotin actually work for hair growth?
Biotin contributes to the maintenance of normal hair, and correcting a biotin shortfall can improve hair and nail health. If you already get enough biotin, the evidence for extra biotin dramatically boosting growth is weaker.
How much biotin should I take a day?
Biotin has a wide safety margin, and high-strength supplements provide large amounts such as 10,000 µg. More is not automatically better; take it consistently rather than in excess.
Why combine biotin with zinc and selenium?
Zinc supports normal hair, skin and nails, and selenium supports normal hair and nails. Combining them with biotin gives more complete support than biotin alone.
Are there any side effects of biotin?
Biotin is generally well tolerated. However, high-dose biotin can interfere with some laboratory blood tests, so tell your doctor you take it before any blood work.
How long does biotin take to work?
Hair and nail changes are gradual. Give a supplement several months of consistent use before judging results.
This article is for general information only and is not medical advice. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle. Do not exceed the recommended daily dose. If you are pregnant, breastfeeding, taking medication or under medical care, consult your doctor or pharmacist before use. Sources: NHS (Vitamins and minerals); EFSA authorised health claims.