• thecary Biotin 5,000µg 90 vegan tablets, front of bottle, UK biotin supplement for hair and skin
  • thecary Biotin 5,000µg 90 vegan tablets, side of bottle showing supplement facts
  • thecary Biotin 5,000µg 90 vegan tablets, side of bottle
  • thecary Biotin 5,000µg 90 vegan tablets, back of bottle with directions
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thecary

Biotin 5,000μg — 90 Vegan Tablets

Biotin 5,000μg — 90 Vegan Tablets

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£15.99 GBP
£15.99 GBP
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Ingredients

Biotin, Bulking Agents (Microcrystalline Cellulose, Di-Calcium Phosphate), Anti-caking Agent (Magnesium Stearate).

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Microcrystalline Cellulose

Category

Fibre

Di Calcium Phosphate

Category

Mineral

Magnesium Stearate

Category

Natural Compound

Biotin

Category

Vitamin

Microcrystalline Cellulose

Acts as a fiber (though typically in small amounts in supplements), provides structure to tablets, generally recognized as safe.

Key Function

Bulking agent, binder, disintegrant.

What it's used for

Pharmaceutical and food additive, mainly as an excipient in tablets and capsules.

Key Benefits

Acts as a fiber (though typically in small amounts in supplements), provides structure to tablets, generally recognized as safe.

Science Behind It

Microcrystalline cellulose (MCC) is a purified, partially depolymerized cellulose. It's an inert, insoluble dietary fiber that is not digested or absorbed by the body. In supplement formulations, its primary role is as a binder to hold ingredients together, a filler or bulking agent to increase tablet size, and a disintegrant to help tablets break down in the digestive tract.

Di Calcium Phosphate

A source of calcium and phosphorus, which are needed for the maintenance of normal bones and teeth.

Key Function

Bone structure, mineral source, bulking agent.

What it's used for

Calcium and phosphorus supplementation, used as a dietary supplement and excipient in tablets.

Key Benefits

A source of calcium and phosphorus, which are needed for the maintenance of normal bones and teeth.

Science Behind It

Di Calcium Phosphate contains both calcium and phosphorus, two essential minerals. Calcium is needed for the maintenance of normal bones and teeth; phosphorus contributes to normal energy-yielding metabolism and the maintenance of normal bones and teeth. In supplements it also acts as a mineral source and a binder.

Magnesium Stearate

Improves manufacturing efficiency, ensures consistent tablet/capsule fill, generally recognized as safe.

Key Function

Lubricant, anti-adherent.

What it's used for

Pharmaceutical and supplement manufacturing aid to prevent ingredients from sticking

Key Benefits

Improves manufacturing efficiency, ensures consistent tablet/capsule fill, generally recognized as safe.

Science Behind It

Magnesium stearate is a salt formed from magnesium and stearic acid, a saturated fatty acid.

Biotin

Contributes to the maintenance of normal hair and skin, normal macronutrient metabolism, and normal function of the nervous system.

Key Function

Coenzyme for carboxylase enzymes, macronutrient metabolism.

What it's used for

Hair, skin, and nail health, energy metabolism.

Key Benefits

Contributes to the maintenance of normal hair and skin, normal macronutrient metabolism, and normal function of the nervous system.

Science Behind It

Biotin is a coenzyme for several carboxylase enzymes that play roles in metabolism, including fatty acid synthesis and the breakdown of certain amino acids. It contributes to the maintenance of normal hair, skin, and mucous membranes, normal macronutrient metabolism, and the normal function of the nervous system.

Biotin 5,000μg by thecary

thecary's Biotin delivers 5,000μg (5mg) per tablet — 10,000% of the EU Nutrient Reference Value, supplied in a clinically meaningful daily dose. Biotin contributes to the maintenance of normal hair and normal skin, as well as normal energy-yielding metabolism and normal functioning of the nervous system.

Also known as Vitamin B7, biotin is a water-soluble B-vitamin essential for the metabolism of fats, proteins and carbohydrates. While outright biotin deficiency is rare in the general population, suboptimal biotin intake is more common among vegans, those on restrictive diets, pregnant and breastfeeding women, and people taking certain medications.

Vegan, GMO-free, no artificial fillers, and made in the UK in an FSSC 22000 certified facility. 90 tablets — a three-month supply taken once daily.

What is biotin?

Biotin (also known as Vitamin B7 or Vitamin H) is a water-soluble B-vitamin essential for human metabolism. It acts as a coenzyme for several enzymes involved in the breakdown of carbohydrates, proteins, and fats — converting the food we eat into the energy our cells use. Biotin occurs naturally in eggs, almonds, salmon, sweet potatoes, and seeds, but the typical Western diet does not consistently provide optimal levels — particularly for those eating fewer animal products.

What thecary's Biotin supports

Hair maintenance. Biotin contributes to the maintenance of normal hair.

Skin health. Biotin contributes to the maintenance of normal skin.

Energy metabolism. Biotin contributes to normal energy-yielding metabolism — playing a central role in converting food into usable energy at the cellular level.

Nervous system function. Biotin contributes to the normal functioning of the nervous system.

Macronutrient metabolism. Biotin contributes to normal macronutrient metabolism, supporting how the body breaks down carbohydrates, proteins, and fats.

Psychological function. Biotin contributes to normal psychological function.

Mucous membranes. Biotin contributes to the maintenance of normal mucous membranes — the soft tissues lining the digestive tract, eyes, mouth and other internal surfaces.

Why 5,000μg?

The EU Nutrient Reference Value (NRV) for biotin is just 50μg — the level required to prevent overt deficiency in the general population. Most popular UK biotin supplements provide 5,000μg to 10,000μg per serving, the doses most commonly used in research and clinical practice for hair and skin support.

Our 5,000μg formula delivers a clinically meaningful dose — well above the basic deficiency-prevention level, while staying below the megadose territory of 10,000μg products. Because biotin is water-soluble, the body excretes any excess via urine, so there is no benefit to going higher than necessary.

Who tends to benefit most from biotin supplementation?

People focused on hair and skin. The most common reason people take biotin. Biotin's role in the maintenance of normal hair and skin is well-established and EFSA-recognised.

Vegans and vegetarians. The richest dietary sources of biotin are eggs and animal-derived foods. Plant-based eaters often have lower biotin intake and may benefit from daily supplementation.

Pregnant and breastfeeding women. Research suggests biotin status often declines during pregnancy and breastfeeding. Always consult your GP or midwife before starting supplements during this period.

People on certain medications. Long-term use of anti-seizure medications and some antibiotics can lower biotin levels.

Anyone on restrictive diets. Low-calorie, low-carbohydrate or otherwise restrictive eating patterns may not provide consistent biotin intake.



How to take Biotin

Take one tablet daily with food and water. Biotin is water-soluble, so it can be taken at any time of day — though most people take it with breakfast as part of a morning routine.

For best results — particularly for hair and skin — take consistently for at least three to six months. Hair and skin cells turn over slowly, so visible changes typically take months rather than weeks to appear.

Food supplements are not a substitute for a balanced diet and healthy lifestyle. Do not exceed the recommended dose.

Critical: Biotin can affect blood test results

High-dose biotin (above 5,000μg daily) can interfere with certain laboratory blood tests, including:

Thyroid function tests (TSH, T3, T4)
Troponin (used to diagnose heart attacks)
Some hormone tests (including pregnancy hormones and reproductive panels)

If you have any blood test scheduled, stop taking biotin at least 72 hours (3 days) beforehand and inform your healthcare provider that you have been taking it. This is a globally recognised safety consideration with high-dose biotin and is not unique to our product — the FDA issued a public alert about this in 2017, and the NHS confirms it on its biotin guidance.

If you are pregnant, breastfeeding, taking medication or under medical supervision, consult your GP before use.

  • Made In UK

  • FSSC 22000

  • Vegan

  • GMO Free

  • Science Backed

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FAQ

thecary icon on a background of green leaves with water droplets

What does biotin do?

Biotin (Vitamin B7) is a water-soluble vitamin the body uses to break down carbohydrates, proteins and fats. EFSA-recognised contributions include the maintenance of normal hair and skin, normal energy-yielding metabolism, normal functioning of the nervous system, normal macronutrient metabolism, and normal psychological function.

Does biotin help hair growth?

Biotin contributes to the maintenance of normal hair, which is its EFSA-recognised role. Research on whether supplementation increases hair growth in non-deficient individuals is mixed, but biotin remains one of the most popular hair-focused supplements globally because its role in supporting healthy hair is well-established. People with diagnosed biotin deficiency typically see the most dramatic effects.

Does biotin help nails?

Biotin is widely associated with nail strength, but EFSA has not approved a specific health claim for biotin and nails. Some smaller studies have suggested biotin may improve brittle nails, but the evidence is less robust than for hair and skin. Take it with realistic expectations on nails specifically.

Is biotin safe to take every day?

Yes. Biotin is water-soluble and the body excretes excess through urine. There is no established upper tolerable intake level, and supplemental doses up to 10,000μg are widely available and considered safe at recommended levels. The main caveat is the blood test interference outlined in the "How to take" section.

How long does it take for biotin to work?

Effects on hair and skin typically take three to six months to become visible because hair and skin cells turn over slowly. Consistency matters more than dose — taking your biotin daily for six months will outperform taking a higher dose intermittently.

Does biotin cause acne?

This is a common concern but the evidence is limited. Biotin and pantothenic acid (Vitamin B5) share an absorption pathway, and very high doses of biotin may temporarily reduce B5 absorption — which some accounts have theoretically linked to acne. Most users experience no acne effect. If you do, discontinue and consult a dermatologist.

Will biotin affect my blood test results?

Yes — this is the single most important thing to know about high-dose biotin. Biotin can interfere with thyroid tests, troponin (heart attack markers), and certain hormone tests. Always stop taking biotin at least 72 hours before any blood test and tell your healthcare provider you have been taking it. The FDA issued a public alert about this in 2017 and the NHS confirms it on official guidance.

Should men take biotin?

Yes. Biotin is essential for both men and women. While biotin is most often marketed for women, men benefit equally from biotin's role in hair, skin, energy metabolism, and nervous system function. Biotin is also commonly used by men experiencing hair thinning.

Is 5,000μg of biotin too much?

No. Biotin has an excellent safety profile and the body excretes excess through urine. 5,000μg is the dose most commonly used in clinical research on biotin for hair and skin, and is widely regarded as the optimal balance between effectiveness and value. The main consideration at this dose is blood test interference, not toxicity.

Is thecary's biotin vegan?

Yes. Our Biotin is fully vegan, GMO-free, and made in the UK in an FSSC 22000 certified facility. The tablet contains no animal-derived ingredients.

Can I take biotin with other supplements?

Yes. Biotin pairs particularly well with our Marine Collagen + Vitamin C (the complete beauty stack), Vitamin B Complex (broader B-vitamin support — though check you are not doubling up on biotin between products), and NMN 500mg (cellular vitality).

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