Biotin

Name: Biotin
Brand: Thorne
SKU: product-0315
Price: 15.00 GBP
Availability: InStock
Rating: 4.9 (43 reviews)

£15.00

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.

Supports keratin production for hair, skin, and nails
May help address brittle nails linked to low biotin status
Relevant for those with diet-related B-vitamin gaps
Supports fatty acid synthesis and glucose metabolism
High-potency, single-ingredient formula from a clinically trusted brand

4.9 (43 reflections)

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About This Product.

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.

Frequently Asked.

Who is most likely to benefit from a biotin supplement?

People 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.

Can high-dose biotin interfere with blood tests?

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.

How long before I notice a difference in hair or nails?

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.

Is it safe to take alongside other B-vitamins or a multivitamin?

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.

Is biotin suitable during pregnancy?

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.

Customer Reflections

Overall Sentiment

4.943 reflections

1 – 6 of 43 reflections

Part of my morning routine now

4 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.

Solid, clean supplement

4 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.

First impressions: pleasantly straightforward

5 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.

Good product, wish the bottle was bigger

5 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.

5 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.

Does exactly what it says

5 months ago

Biotin

About This Product.

How to Take It

Frequently Asked.

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