Beauty supplements have a headline nutrient, and it's biotin. It's on the front of every jar, it's what people search for, and it gets the credit for anything good that happens to your hair.

Meanwhile, two minerals sit further down the label doing an enormous amount of quiet work. Zinc and selenium aren't glamorous. They're also two of the most useful things in a beauty-from-within formulation, and they're worth understanding properly.

What zinc actually contributes

Zinc is involved in hundreds of enzyme reactions in the body, and several of them matter directly here. Under UK and EU rules, zinc can be described as contributing to the maintenance of normal hair, normal skin and normal nails — all three, which is unusual for a single nutrient.

It also contributes to normal DNA synthesis and normal protein synthesis. That's the dry way of describing cell turnover, which is the process your skin relies on constantly and your hair follicles depend on to keep producing.

Those are authorised claims, not marketing language. Which is precisely why zinc turns up in almost every serious beauty formulation — there's a solid regulatory basis for including it.

And selenium

Selenium is a trace mineral, meaning you need very little of it, but the little you need is non-negotiable. It contributes to the maintenance of normal hair and normal nails, and to the protection of cells from oxidative stress.

UK soil is relatively low in selenium compared with parts of the world like North America, which means British-grown crops tend to carry less of it than the same crops grown elsewhere. Brazil nuts are the famous exception — genuinely one of the richest sources going.

A word of caution that's worth stating clearly: selenium has a comparatively narrow window between not enough and too much. Stick to stated doses, and don't stack multiple selenium-containing products on the assumption that more is better. It isn't.

Why they work better together

Nutrients rarely act alone. Hair, skin and nails are all built largely from keratin, a protein, and building protein requires a set of cofactors rather than a single hero ingredient.

Zinc supports the synthesis side. Selenium supports antioxidant defence. Biotin contributes to the maintenance of normal hair and normal skin. Vitamin C contributes to normal collagen formation. Each covers a different part of the same picture, which is why a formulation with eight sensibly-dosed nutrients tends to be more useful than a single mega-dose of one.

Our Hair, Skin & Nails Gummies are built on that logic — biotin, zinc and selenium alongside vitamins A, C, D and E, rather than a huge biotin number and not much else.

Getting them from food first

Supplements complement a diet, they don't replace it, so it's worth knowing where these show up on a plate.

• Zinc — pumpkin seeds, chickpeas, lentils, cashews, oats, wholegrains. Shellfish is the richest source if you eat it.
• Selenium — Brazil nuts (two or three is plenty), wholegrains, eggs, fish, sunflower seeds.

Worth knowing if you're plant-based: phytates in grains and pulses reduce zinc absorption somewhat. Soaking, sprouting and fermenting all help, which is a nice argument for sourdough over standard bread if you needed one.

The timeline nobody mentions

Here's the part that gets skipped in the marketing. Hair grows roughly a centimetre a month, and nails more slowly still. Anything you take today affects the section currently being formed at the root — not the length already sitting on your head.

So the honest expectation is months, not weeks. Nails tend to show change first, around the two to three month mark. Hair takes longer, often three to six months before there's anything visible. Skin, being faster to turn over, can shift sooner.

Consistency over that window matters far more than the dose. This is the single most common reason people conclude a beauty supplement "didn't work" — they judged it at week three.

FAQ

Can I take zinc and selenium together?

Yes — they're routinely formulated together and complement each other well. What's worth avoiding is doubling up by taking a multivitamin plus a separate beauty supplement plus a standalone mineral, which can quietly push you well past sensible amounts.

Are Brazil nuts enough on their own for selenium?

They can be, though selenium content varies enormously depending on where they were grown, so it's hard to be precise. Two or three a day is the usual guidance. More is genuinely not better with this one.

Do I need these if I already take a multivitamin?

Often not. A good multivitamin usually includes both at sensible levels. A dedicated beauty formulation makes more sense if hair, skin and nails are your specific focus and you want those nutrients at levels tuned for it — but taking both isn't automatically better.

The unglamorous conclusion

Beauty from within is mostly just adequate nutrition, applied consistently, over a longer period than anyone would like.

If you'd rather not assemble that from individual minerals, our Hair, Skin & Nails Gummies bring the set together in one zero sugar, Vegan+ gummy, and the Multivitamin Gummies cover the wider basics if you want a foundation instead. Both live in the vitamins collection.

Give it three months. Then judge it.

Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle.