Hair, Skin and Nails: Biotin and Collagen Explained

Biotin and collagen are the two most popular supplements for hair, skin and nails, but the evidence behind both is weaker than the marketing suggests. Biotin only helps if you are low in it, which is rare, and collagen has some positive skin studies that are mostly small and often funded by industry.

There is also one safety point that matters more than any benefit: high-dose biotin can throw off some blood test results, so always tell your doctor and the pathology lab if you take it.

Biotin vs collagen at a glance

Prices are at the time of writing.

Biotin: why most people do not need extra

Biotin helps your body turn food into energy, and it is found in foods such as eggs, nuts, seeds and some vegetables. The US National Institutes of Health (NIH) says adults need about 30 mcg a day, most people get enough from food, and deficiency is very rare. People with a rare inherited condition called biotinidase deficiency, those who drink heavily, and pregnant or breastfeeding women may need more, which is a conversation for your GP.

The NIH also says there is little scientific evidence for biotin supplements for hair, skin or nails. A few small studies found that some people with thin, brittle nails had harder nails on high doses, but more research is needed. A guidance document from the Association for Diagnostics and Laboratory Medicine goes further, stating there is no clinical evidence supporting high-dose biotin for cosmetic concerns.

If you still want to try it, a lower dose makes more sense than the 5,000 to 10,000 mcg products you often see. Life Extension Biotin 600 mcg gives 600 mcg per capsule, with 100 capsules for $19.95. That is still about 20 times the daily need, but it is under 1 mg (1,000 mcg), and lab problems are mainly reported at 5 mg or more.

Biotin and blood tests: tell your doctor

Many blood tests use biotin as part of the testing method, so high levels of biotin in your blood can give a falsely high or falsely low result. The lab guidance lists thyroid tests and troponin, a heart test used in emergency departments, among the tests that can be affected. The US FDA issued a safety warning about this in 2017.

• Supplements of 5 mg (5,000 mcg) or more can raise blood biotin enough to interfere with some tests. Products with up to 1 mg have not been reported to cause problems.
• Always tell your GP and the pathology collector about any biotin you take, including biotin inside multivitamins and hair, skin and nail blends.
• Your doctor may ask you to stop biotin for a set time before a test. Follow their advice rather than guessing.

Collagen: what the skin research shows

A 2021 meta-analysis by de Miranda and colleagues pooled 19 studies with 1,125 people and found that hydrolysed collagen improved skin hydration, elasticity and wrinkles. That sounds convincing, but a 2025 meta-analysis by Myung and Park, covering 23 trials with 1,474 people, dug deeper. When they looked only at trials not funded by supplement companies, or only at higher-quality trials, the benefits for hydration, elasticity and wrinkles disappeared. The authors concluded there is currently no clinical evidence to support collagen supplements for skin ageing.

For nails, one small 2017 study of 25 people reported faster growth and fewer broken nails on 2.5 g of collagen a day, but it had no placebo group, so it cannot show cause and effect. For hair, there is very little research at all.

The honest summary: collagen counts toward your daily protein, but any skin benefit is uncertain. If you try it, think of it as an experiment and judge it after a couple of months. Learn more about the different types in our collagen types guide.

Choosing a collagen supplement

• R1 Collagen by Rule 1 gives 10 g of hydrolysed bovine collagen per scoop, plus 80 mg of hyaluronic acid and 90 mg of vitamin C. The unflavoured 25 serve tub is $54.95 (about $2.20 a scoop) and the 50 serve tub is $74.95 (about $1.50 a scoop). It is one of our best selling collagen powders over the last six months.
• NOWAY Collagen Protein by ATP Science is a dairy-free protein powder made from hydrolysed bovine collagen, with 20.8 g of protein per 25 g scoop (Vanilla). At $79.95 for 30 serves, about $2.67 a serve, it suits you if you want collagen to count as a protein shake.

Compare more options in our best collagen supplement guide.

Habits that matter more for hair, skin and nails

• Eat enough protein and energy. Hair and nails are made of protein, and crash dieting can show up in both. Read more in our post on protein and hair growth.
• Protect your skin from the sun. Sunscreen, a hat and not smoking are the well-established basics for your skin.
• See your GP about sudden hair loss. Shedding that is sudden, patchy or heavy can have a medical cause, so get it checked before spending money on supplements.

Which should you choose?

If your diet is varied, you very likely do not need biotin, and if you take it, keep the dose modest and tell your doctor before any blood test. Collagen is the more reasonable experiment if you are curious, with the caveat that the best-quality studies have not shown a clear skin benefit. For the best value, choose the 50 serve tub of R1 Collagen. If you would rather get a full protein shake, NOWAY Collagen Protein does both jobs.

Our pick for most people is R1 Collagen, alongside enough protein, sunscreen and a GP check for any unusual hair loss. Browse the hair health and skin health ranges. Online orders ship Australia-wide with free shipping on orders of $99.99 or more, and click and collect and Afterpay are available.

How our price compares

Here is what the same products cost at other Australian supplement stores, so you can check the difference yourself.

Supps247 prices come from our website. Other prices were checked on the websites of Nutrition Warehouse, Australian Sports Nutrition (ASN), Elite Supps and Supplement Mart on 29 October 2026 (same product and size, price for one unit) and can change at any time. Sale means it was on sale that day. Other sizes only means they sell it in a different size. Not confirmed means we could not confirm the same product and size. Supps247 members can use our Price Match Guarantee against Nutrition Warehouse, ASN, Elite Supps and Supplement Mart: we beat their full price by 5% or match their sale price (conditions apply).

Shop the products in this guide

R1 Collagen 50 serves$74.95R1 Collagen 25 serves$54.95NOWAY Collagen Protein$79.95Life Extension Biotin 600 mcg$19.95

Browse all collagen supplements and the skin health range.

FAQs

Does biotin help hair grow?

Only if you are low in it, and biotin deficiency is very rare. The US National Institutes of Health says there is little scientific evidence that biotin supplements help hair, skin or nails in people who already get enough. If your hair is thinning or shedding, see your GP so they can look for a cause, rather than starting a high-dose biotin product.

Can biotin affect blood test results?

Yes. Many lab tests use biotin as part of the method, so high blood levels can give falsely high or low results, including for thyroid tests and troponin, a heart test. Laboratory guidance says doses of 5 mg (5,000 mcg) or more can cause problems. Tell your doctor and the pathology collector about any biotin you take, and follow their advice about stopping before a test.

Does collagen really work for skin?

The evidence is mixed. A 2021 meta-analysis of 19 studies found improvements in skin hydration, elasticity and wrinkles, but a 2025 meta-analysis of 23 trials found the benefits disappeared when only higher-quality or non-industry-funded trials were included. Collagen adds protein to your diet, but any skin benefit is uncertain, so judge it on your own results over a couple of months.

How much collagen should I take a day?

Studies have used a wide range, from 2.5 g a day in the nail study to around 10 g in many skin products. One scoop of R1 Collagen gives 10 g, which sits at the higher end. There is no official daily target for collagen. If you mainly want more protein, a collagen protein powder with around 20 g per serve, or a whey protein, will do more for your total daily intake.

Can I take biotin and collagen together?

Yes, there is no known problem taking them together, and some hair, skin and nail blends already combine them. Add up the biotin across everything you take, including multivitamins, and keep it modest. Most importantly, tell your doctor about your biotin intake before any blood test. If you are pregnant, breastfeeding or have a medical condition, check with your GP first.

Sources: NIH Office of Dietary Supplements: biotin fact sheet; ADLM (AACC) guidance document on biotin interference in laboratory tests (2020); de Miranda et al. Hydrolysed collagen and skin ageing, meta-analysis (2021); Myung and Park. Collagen supplements and skin aging, meta-analysis (2025); Hexsel et al. Collagen and brittle nails (2017); product labels and brand nutrition panels, checked October 2026.

Order online with Australia-wide delivery, free on orders of $99.99 or more, with Afterpay available at checkout. You can also use click and collect at a store that offers it, or visit a Supps247 store in Melbourne, regional Victoria or Brisbane to compare products in person. Members can use our member price match on full-priced items.

Prices and stock were checked on 29 October 2026 and can change at any time. Always read the label and follow the directions for use. If you have a medical condition, are pregnant or take regular medication, check with your doctor first.