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Thorne Biotin is a single-ingredient supplement providing biotin, a B-vitamin (B7) that plays a central role in keratin production - the structural protein that makes up hair, skin, and nails.
£25
Thorne Biotin is a single-ingredient supplement providing biotin, a B-vitamin (B7) that plays a central role in keratin production - the structural protein that makes up hair, skin, and nails.
Thorne Biotin is a single-ingredient supplement providing biotin, a B-vitamin (B7) that plays a central role in keratin production - the structural protein that makes up hair, skin, and nails.
Take 1 capsule daily, as directed on the packaging. Biotin is water-soluble and can generally be taken with or without food. Consistency over several weeks is typically needed before changes to hair or nail quality become noticeable.
Thorne Biotin is a single-ingredient supplement providing biotin, a B-vitamin (B7) that plays a central role in keratin production - the structural protein that makes up hair, skin, and nails. It also supports fatty acid synthesis and glucose metabolism, which means it earns its place beyond cosmetic concerns alone.
Biotin deficiency, though not common in those eating a varied diet, does occur - and when it does, the signs often show up first in brittle nails, thinning hair, and dry or flaky skin. This supplement is well suited to people with confirmed or suspected low biotin status, those following restrictive diets, pregnant women (whose requirements increase), or individuals taking medications that may interfere with B-vitamin absorption over time.
At 8,000 mcg per capsule, this is a high-potency dose. Biotin is water-soluble, so the body does not store excess, and toxicity is not a documented concern at supplemental levels - but at high doses it is worth noting that biotin can interfere with certain thyroid and troponin blood tests, producing false results. If you have bloodwork scheduled, flag biotin use to your clinician.
Thorne is a brand with a long-standing reputation for formulation rigour and clean manufacturing standards. Their supplements are regularly used in clinical and research settings, which is part of why they appear across our doctor-curated range.
Standard UK delivery included on every order, 1 to 3 working days after dispatch.
Next working day for £25 when you order by 12pm. Orders placed before 12pm on a working day leave the same day. Later orders leave the next working day.
You can return unopened and unused items within 30 days of delivery. This does not affect your statutory rights. Read the delivery and returns terms
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Sign inPeople with confirmed low biotin levels, those on restrictive diets, pregnant women, or anyone taking medications that may deplete B-vitamins over time are most likely to see a meaningful benefit. For those with adequate dietary intake, the evidence for cosmetic improvements is more limited.
Yes — this is clinically important. High-dose biotin supplementation can interfere with certain immunoassay-based blood tests, including some thyroid function panels and cardiac troponin tests, potentially producing misleading results. Inform your GP or clinician that you are taking biotin before any bloodwork.
Hair and nail growth cycles are slow. Most people would not expect to notice a change in texture or strength for at least 8–12 weeks of consistent daily use. If you see no improvement after three months, it is worth revisiting whether biotin deficiency is the underlying cause.
Generally yes, but check the biotin content of any multivitamin you are already taking to avoid unintentionally stacking very high doses. If in doubt, check the combined total with your prescribing clinician.
Biotin requirements do increase during pregnancy, and deficiency is more common in this group. That said, always discuss any new supplement with your midwife or obstetrician before starting, particularly at high-potency doses.
Overall
6 months ago
Take one with breakfast every day and I've genuinely noticed a difference in my nails over the past couple of months. They used to peel and snap constantly. Still not perfect but way sturdier than before.
6 months ago
I'm fairly particular about what goes in my body and Thorne ticks the right boxes. No fillers I'm worried about, capsule's easy to swallow. Does what I wanted.
6 months ago
Picked this up after my GP mentioned my levels might be on the low side. Capsule is small and easy to swallow, no weird smell or aftertaste which I half expected. Only been on it three weeks so it's early days, but my nails already feel less brittle — could be coincidence but I'll take it. Clean label, no fillers I had to look up. Good start.
6 months ago
Works well and I've been happy with the results on my hair — less breakage after about six weeks. My only gripe is that the bottle only has 60 capsules, so at a daily dose it runs out faster than I'd like. A 90-cap option would be ideal.
6 months ago
Started taking this after my GP mentioned my diet might be low in B vitamins. Three months in and my skin looks noticeably less dull. Happy with it.
7 months ago
Hair consultation, £150LondonA doctor finds what is behind thinning.At our clinic in Marylebone, London, doctors also offer PRP hair treatment and private blood tests.
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