It's the talk of the town for those seeking healthier strands, touted for its strengthening and lengthening powers, but is biotin for hair really as beneficial as it seems? It plays a starring role in most (if not, all) hair growth supplements, and while many boast rave reviews, we want to know if there’s any real science behind the claims.
If you’re searching for ways to make your hair grow faster, you've likely already heard of biotin, as not only is it a key ingredient in hair, nail and skin supplements, but it can also be found in many of the best shampoos and conditioners, and best hair masks around. Much like scalp oil for hair growth, biotin for hair has been embraced by a new generation and is trending on social media, so clearly, it's considered to be something of a mane-changer. That said, if this is your first introduction to the strand-loving ingredient, you no doubt have some questions on what exactly it is and how it functions as part of your haircare routine.
So, we've asked the experts to break down everything there is to know about biotin, from what it is to the best ways to use it for healthy, strong growth.
Everything you need to know about biotin for hair, explained by experts
Whether you're looking to treat your strands to some TLC by way of a leave-in treatment or to invest in a hardworking best shampoo for fine hair, let's say, that features the strengthening ingredient, we've quizzed the pros on all things biotin...
What is biotin?
"Biotin, also known as vitamin H and vitamin B7, is an essential nutrient that helps the body metabolize fats and carbohydrates," explains Anabel Kingsley, consultant trichologist and Phillip Kingsley brand president. "It also aids in the breakdown and use of amino acids (proteins) – the substance that forms the bulk of your strands."
Like all B vitamins, Biotin is water-soluble – meaning the body doesn’t store it and thus, according to Kingsley, it should be consumed every day. "You can find it in many foods such as egg yolks, almonds, milk, sweet potato, and salmon," she adds.
Can biotin help hair growth?
Several supplement brands claim that increased biotin intake can encourage hair growth and help with hair thinning. But if you look at the research, the evidence supporting this link is limited. "There’s no proven evidence to suggest that supplementing biotin alone promotes hair growth," says Belle Cannan, co-founder of Salon Sloane and ambassador for Hair Rituals by Sisley.
With that said, both experts agree that biotin does play a part in the overall health of your hair. "It can help to strengthen and improve the integrity of growing hairs," says Kingsley. "And by strengthening growing hairs, they’re less likely to fall out – meaning hair looks healthier and thicker," adds Cannan. Some research suggests that, much like trying rice water for hair treatments, biotin can bolster shine, too.
Biotin is not just beneficial for the hair, either. "Many people notice improvements to their nails when taking biotin – slightly before they notice changes to their hair," says Kingsley.
Is it good to take biotin every day?
"Biotin deficiencies are relatively uncommon," explains Kingsley. And most people can get enough biotin by eating a healthy, balanced and nutritious diet. "Taking biotin can be helpful, however, if you have a low-protein diet as it helps the body to utilize the proteins you ingest," continues Kingsley.
If you’re experiencing hair thinning or shedding, it’s best to consult an expert who can help to identify the cause of hair loss and advise on the best course of treatment, whether that's a daily dose of biotin for hair via supplement, or something else. They will also be able to test for a biotin deficiency, along with other nutritional deficiencies.
How to use biotin for hair
As we’ve mentioned, biotin is commonplace in hair growth supplements. And while there’s limited evidence to say that biotin can promote hair re-growth or that it's an effective treatment for hair loss – it does promote stronger, shinier strands. But before you go ahead and take a new supplement, it’s never a bad idea to consult your GP.
"Biotin rarely causes adverse side effects," says Kingsley, "and as it’s water-soluble, any excess is excreted in your urine," Kingsley notes that some people, however, do find it may cause initial breaking out of their skin. "Taking biotin within 48 hours of having a blood test may also falsely skew thyroid readings," warns Kingsley, "so you should stop taking it beforehand."
Supplements aside, biotin can also be found in topical hair products like shampoo, where it’s often combined with other nourishing ingredients to create a hair health-boosting cocktail.
Our beauty team's top hair products with biotin
RRP: £45
Designed to strengthen strands, these daily capsules contain biotin alongside zinc, anagain, and selenium to protect hair from oxidative stress and support healthy hair follicles. In clinical trials, 71% of participants perceived an improvement in overall hair condition.
RRP: £7.49
Brimming with powerhouse ingredients, this rich shampoo plumps up and strengthens strands – thanks to biotin, collagen and wheat proteins. Hair is left smooth and hydrated. Just note that it is heavily scented – which means it may not be suitable for sensitive scalps.
RRP: £6.99
For a leave-in treatment, this one from HASK features a hardworking blend of biotin and collagen to prevent breakages, whilst conditioning, detangling and thickening the feel of your hair. It also delivers heat protection up to 400°F/205°C, adds shine and controls frizz.
