Vitamins for Skin, Hair, and Nails: The Evidence-Based Approach

The vitamins that matter most for skin, hair and nails are vitamin C, vitamins A and E, the B vitamins, vitamin D, and the minerals iron, zinc and selenium. They supply the building blocks and cofactors your body uses to make collagen, elastin and keratin, the proteins that give these tissues their structure.

High-dose biotin gets most of the attention, but it only helps much if you're actually deficient, which is rare. For most people, correcting common shortfalls such as low iron or vitamin D, and getting a balanced mix of nutrients, does more. Expect to wait: hair and nails take 3 to 6 months to show a change.

How nutrition shows up in your skin, hair and nails

Hair and nails are made mostly of keratin, a tough protein produced by cells called keratinocytes. These cells need a steady supply of energy and specific nutrients to divide and mature properly.

Skin depends on a scaffold of collagen and elastin fibers in the dermis, made by cells called fibroblasts. The enzymes that build collagen (prolyl hydroxylase and lysyl hydroxylase) need vitamin C to work. Without enough of it, skin gradually loses elasticity.

Hair follicles are among the fastest-dividing cells in the body, which makes them sensitive to shortfalls. When nutrients are scarce, your body sends them to vital organs first and away from hair and nails. That's why thinning hair or brittle nails are often the first visible signs of common nutrient deficiencies in women.

Does biotin work for hair?

Biotin (vitamin B7) helps your body process fatty acids and amino acids, the building blocks of protein. A true biotin deficiency causes hair loss and scaly rashes, but it's rare in the general population. For people who aren't deficient, large doses don't appear to speed up hair growth.

Nails may be a different story. In people with brittle nail syndrome, small trials have found that daily biotin increased nail thickness by up to 25%. If your nails split or peel, biotin may be worth trying.

High-dose biotin can distort some blood tests, including thyroid and troponin results, so tell your healthcare provider you take it before any lab work.

Vitamins for skin

Vitamin C is the key nutrient for skin. Besides its role in making collagen, it's an antioxidant that neutralizes the reactive molecules produced by UV light and pollution, which contribute to premature aging.

Vitamin E works alongside vitamin C, and the two help regenerate each other and protect cell membranes. This combination may support your skin's ability to repair itself after sun exposure. Vitamin A (familiar in topical form as retinol) supports skin cell turnover, and taken orally it helps keep the skin barrier intact.

Vitamin D also plays a part. Its receptors are found throughout the skin, where it helps with the barrier's defenses against microbes. Aranow and colleagues (Journal of Investigative Medicine, 2011) noted that vitamin D receptors are on nearly all immune cells and that deficiency is linked to more infections and autoimmune conditions. Whether that explains inflammatory skin conditions such as psoriasis or eczema is less certain.

Iron and vitamin D for hair

Before trying special hair supplements, rule out the common deficiencies. Low iron is one of the leading causes of hair thinning in women, even without anemia. Iron is needed for hemoglobin, which carries oxygen to your cells, including hair follicles. When follicles get too little, more of them move into the resting (telogen) phase early, and you shed more.

Low vitamin D is also widespread. Forrest and Stuhldreher (Nutrition Research, 2011) found that about 41.6% of US adults are deficient (below 20 ng/mL). Low vitamin D has been linked to telogen effluvium and other types of hair loss. Many clinicians aim for a level around 30 to 50 ng/mL. Our article on the signs of vitamin D deficiency covers the symptoms.

B vitamins

The B vitamins power the energy metabolism that fast-dividing hair and skin cells depend on. B12 is needed to make DNA and red blood cells, and a deficiency can darken patches of skin and change nail color. Allen and colleagues (American Journal of Clinical Nutrition, 2009) reported that B12 deficiency affects about 6% of adults under 60 and nearly 20% of those over 60, with vegans at far higher risk.

B vitamins dissolve in water and aren't stored in large amounts, so you need them daily. Our article on B vitamins and energy explains how they work.

Zinc and selenium

Zinc supports the growth and repair of hair tissue and helps the oil glands around the follicles work properly. Increased shedding can be a sign of low zinc, and white spots on the nails are sometimes attributed to it. Too much zinc, though, interferes with copper absorption, and copper is needed for the pigment (melanin) in hair and skin.

Selenium helps make selenoproteins, which protect hair follicles from oxidative damage. Both too little and too much selenium can cause hair loss, so more isn't better.

Building a routine

A balanced formula covers these nutrients together, which is usually better than single high doses of one or two. A daily multivitamin can catch the small gaps a healthy diet still leaves, especially when your meals aren't always planned. Our women's multivitamin guide explains what to look for.

Be patient. The hair you see today formed months ago, and a fingernail takes roughly six months to grow from cuticle to tip. You may notice changes in your skin within a few weeks, but hair and nails usually need 3 to 6 months of steady intake.

Where Go Wise Multivitamin fits

Go Wise Multivitamin is a powder stick you pour onto your tongue, with no water needed and a natural berry flavor. Each stick has vitamins A, C, D3, E, B6 and B12, niacin, pantothenic acid, biotin, folic acid, zinc and chromium, plus elderberry extract and kelp as a natural source of iodine. It's vegan, gluten-free and has no artificial colors or flavors. Every batch is third-party tested by Eurofins for heavy metals and microbial contamination, and it is made in a GMP-certified facility.

Frequently asked questions

How long does it take for hair and nail vitamins to work?

Hair and nails are non-living once they grow out, so you have to wait for new growth. Most people notice a change in their skin within 2 to 4 weeks, but it usually takes 3 to 6 months of steady use to see a real difference in hair thickness or nail strength.

Can I take biotin every day?

Yes. Biotin is a water-soluble B vitamin, so your body gets rid of what it doesn't use. Very high doses are usually unnecessary and can interfere with blood tests. The moderate amount in a multivitamin is enough for most people.

What are the signs of a vitamin deficiency affecting my hair?

More shedding (telogen effluvium), brittle or thinning strands, and dull hair. These are often linked to low iron, vitamin D or B12. If you notice sudden, patchy hair loss, see a doctor, because it may be a medical condition rather than a deficiency.

Does vitamin C really help with skin aging?

Vitamin C is needed to make collagen and protects against UV damage as an antioxidant. It won't erase deep wrinkles, but it may support firmness and brighten your complexion by limiting excess melanin production.

Should I take iron for hair growth?

Only if you have a confirmed deficiency or a professional advises it. Low iron is a major cause of hair thinning, but too much iron can be toxic. A multivitamin with a modest amount of iron is generally safe for premenopausal women, while higher doses need medical supervision.

Is a vegan diet bad for hair and nails?

Not necessarily, but vegans are at higher risk of low B12 and iron, both important for hair and nails. A vegan multivitamin that includes these nutrients can help keep growth healthy on a plant-based diet.

If your hair is thinning or your nails are brittle, ask your healthcare provider to check your iron, vitamin D and B12 before you buy a hair supplement.

References

• Aranow et al. Journal of Investigative Medicine. 2011.
• Forrest and Stuhldreher. Nutrition Research. 2011.
• Allen et al. American Journal of Clinical Nutrition. 2009.

This article is for general information and isn't medical advice. Talk to your healthcare provider before starting a supplement, especially if you are pregnant, nursing or taking other medication.