Biotin Capsules

What Are Biotin Capsules and How Can They Help You?

If you've been noticing more hair in the shower drain or your nails keep splitting, you might be wondering whether a nutritional gap is to blame. Biotin capsules — also known as vitamin B7 or vitamin H — are one of the most widely used supplements for supporting hair, skin, and nail health in the UK. Biotin is a water-soluble B vitamin that your body needs to convert food into energy and to maintain the structural proteins that keep your hair and nails strong. You can browse our full range of vitamins and supplements if you're looking to support your overall wellbeing alongside biotin.

Most people get some biotin through their diet — eggs, nuts, seeds, and salmon are all decent sources — but intake can fall short, particularly in those following restrictive diets or experiencing increased nutritional demands. A deficiency, though uncommon in the UK, can lead to thinning hair, brittle nails, and skin changes. Supplementing with biotin capsules is a straightforward way to help bridge that gap.

How Do Biotin Capsules Work in the Body?

Biotin functions as a coenzyme — essentially a helper molecule — for several carboxylase enzymes involved in key metabolic pathways. Here's what that means in practice:

• It supports fatty acid synthesis, which helps maintain the lipid barrier of your skin.
• It plays a role in amino acid metabolism, particularly of leucine, which contributes to protein production.
• It assists gluconeogenesis — the process of producing glucose from non-carbohydrate sources — helping sustain energy levels.
• Crucially, it supports the production of keratin, the structural protein that forms the basis of hair shafts and nail plates.

Without adequate biotin, keratin synthesis can be impaired, which may manifest as hair thinning or brittle nails. Supplementing helps restore the coenzyme activity needed to keep these processes running efficiently.

Who Should Consider Using Biotin Capsules?

Biotin capsules are suitable for a broad range of adults, but they're particularly relevant for certain groups. If you're experiencing hair thinning, you may also want to explore our female hair loss collection for additional targeted options.

• Adults experiencing hair thinning or increased hair shedding not caused by an underlying medical condition.
• People with brittle nails that break or peel easily.
• Those following vegan or vegetarian diets, where dietary biotin sources may be limited.
• Individuals taking long-term anticonvulsant medication, which can deplete biotin levels over time.

It's worth noting that biotin supplementation is unlikely to produce dramatic results if your hair loss has a hormonal or medical cause. Always speak to your GP if hair loss is sudden, patchy, or accompanied by other symptoms.

How Do Biotin Capsules Compare to Other Hair and Nail Supplements?

Is It Safe to Store and Use Biotin Capsules Long Term?

Biotin is water-soluble, meaning excess amounts are generally excreted in urine rather than accumulating in body tissues — which makes toxicity at typical supplement doses unlikely. That said, high-dose biotin supplementation has been shown to interfere with certain laboratory blood tests, including thyroid function tests and troponin assays used in cardiac investigations. Always inform your doctor or pharmacist that you are taking biotin capsules before any blood tests are arranged.

Store your biotin capsules below 25°C in a cool, dry place away from direct sunlight. Keep them out of reach of children. Do not use after the expiry date printed on the packaging. If you're also managing skin concerns alongside hair health, our skin care collection may offer complementary support.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

What Are Biotin Capsules and What Are They Used For?

Biotin capsules contain vitamin B7, a water-soluble B-group vitamin that plays an essential role in energy metabolism and the maintenance of normal hair, skin, and nail function. In the UK, biotin supplements are sold as food supplements rather than licensed medicines, meaning they are available without a prescription. They are commonly used by adults who want to support hair growth, reduce nail brittleness, or address a dietary shortfall in this nutrient. Biotin is not stored in significant quantities by the body, so regular daily intake — whether through food or supplementation — is important.

What Do You Need to Know Before Using Biotin Capsules?

Before starting any new supplement, it's sensible to consider whether it's appropriate for your individual circumstances. Biotin is generally well tolerated, but there are some important points to be aware of.

Do not use biotin capsules if you:

• Have a known allergy or hypersensitivity to biotin or any of the capsule excipients.
• Are under 18 years of age, unless advised by a healthcare professional.

Use with caution and seek advice if you:

• Are pregnant or breastfeeding — while biotin is considered safe at normal dietary levels, high-dose supplementation during pregnancy should only be taken on medical advice.
• Are due to have blood tests — high-dose biotin can interfere with immunoassay-based laboratory tests, including thyroid function, troponin, and vitamin D assays.
• Have a kidney condition, as altered excretion may affect how the body handles water-soluble vitamins.

Known drug interactions:

• Anticonvulsant medicines (e.g. carbamazepine, phenytoin, primidone) can reduce biotin absorption and increase its breakdown — people on long-term anticonvulsants may have lower biotin levels as a result.
• Raw egg white consumed in large quantities contains avidin, a protein that binds biotin and prevents its absorption — this is a dietary rather than drug interaction, but worth knowing.
• Alpha-lipoic acid may compete with biotin for intestinal absorption if taken simultaneously.

How Should You Use Biotin Capsules?

Using biotin capsules correctly gives you the best chance of seeing results. Consistency matters more than anything else here — hair and nail growth cycles are slow, so patience is key.

1. Read the product label carefully before starting.
2. Take one capsule daily, or as directed on the packaging.
3. Swallow the capsule whole with a full glass of water.
4. Take with food to minimise any chance of mild stomach discomfort.
5. Take at the same time each day to build a consistent routine.
6. Do not exceed the stated daily dose.

What Are the Possible Side Effects of Biotin Capsules?

Biotin is considered safe at the doses found in most over-the-counter supplements. Serious adverse effects are rare. That said, some people do report mild reactions, particularly when starting supplementation.

Common side effects:

• Mild nausea, particularly if taken on an empty stomach.
• Digestive discomfort or bloating.

Less common side effects:

• Skin rash or mild acne-like breakouts — some users report this, though the evidence linking biotin directly to acne is limited.
• Headache.
• Interference with laboratory blood test results (not a symptom, but a clinically important effect to be aware of).

If you experience any allergic reaction — such as swelling of the face, lips, or throat, difficulty breathing, or a widespread rash — stop taking the capsules immediately and seek urgent medical attention. You can also explore our hair care collection for topical products that may complement your supplement routine.

How Should You Store Biotin Capsules?

• Store below 25°C in a cool, dry place.
• Keep away from direct sunlight and sources of heat.
• Keep the container tightly closed when not in use.
• Store out of sight and reach of children.
• Do not use after the expiry date printed on the packaging.
• Do not transfer capsules to a different container unless advised to do so.
• Do not dispose of medicines via wastewater or household waste — return unused capsules to your pharmacy for safe disposal.