Short answer: Biotin is an essential B vitamin your body uses to build keratin, the protein hair is made of, so it genuinely matters for healthy hair. But the evidence is clear-eyed: biotin supplements make the biggest difference for people whose levels are low, and there's little proof that extra biotin dramatically speeds up growth in someone who already gets enough. The realistic role of a biotin gummy is to support normal, healthy hair as part of a balanced routine, not to act as a miracle growth cure.
With that in mind, here's everything worth knowing.
What is biotin, and what does it do for hair?
Biotin (also called vitamin B7) is a water-soluble B vitamin. It works as a helper molecule for enzymes involved in how your body processes fats and amino acids. Since hair is roughly 95% keratin, a protein built from amino acids, biotin plays a genuine background role in keeping hair, skin and nails healthy. That biological link is exactly why biotin became the poster-child ingredient for hair supplements.
Does biotin actually make hair grow?
This is where the marketing and the science part ways.
A true biotin deficiency can cause hair thinning and shedding, and in those cases, correcting the deficiency reverses the problem. The catch is that meaningful biotin deficiency is uncommon in healthy adults who eat a varied diet. When dermatology researchers have reviewed the evidence, they've consistently found no good-quality proof that biotin boosts hair growth in people who aren't deficient. In other words: if your levels are already fine, taking more biotin is unlikely to transform your hair on its own.
One nuance worth knowing: studies suggest that combination formulas, biotin alongside other hair-relevant nutrients, tend to perform better than biotin taken in isolation. Hair health draws on a whole cast of nutrients, not a single hero ingredient.
Who's most likely to benefit?
You're more likely to notice a difference from a biotin supplement if your intake is on the low side, for example, with very restrictive or limited diets. If you eat a balanced, varied diet, you're most likely already getting what you need from everyday foods. Biotin deficiency is genuinely uncommon in healthy adults who eat well, which is a big part of why extra biotin doesn't do much for people who already have enough.
Which foods contain biotin?
Biotin is found in lots of everyday foods, which is why most people who eat a varied diet get enough without thinking about it. If you'd like to gauge your own intake, good sources include:
- Cooked eggs, especially the yolk (one of the richest everyday sources)
- Nuts, like almonds, peanuts and walnuts
- Seeds, such as sunflower seeds
- Legumes, like soybeans and other beans
- Fish, like salmon and other varieties
- Liver and organ meats, among the richest sources of all
- Sweet potato
- Whole grains and oats
- Vegetables, like mushrooms, cauliflower and spinach
- Bananas and avocado
If a few of these are regular features in your meals, you're likely getting a steady supply.
How much biotin do I need?
Australia doesn't set a formal RDI for biotin, there isn't enough data to establish one, so the NHMRC instead sets an Adequate Intake (AI) of 30 µg per day for men and 25 µg per day for women. Most people reach this through diet alone, and supplements typically provide more. Follow the product label and your health professional's advice.
Is biotin safe?
Biotin is water-soluble, which means your body doesn't store the excess. It's well tolerated and adverse effects are rare. Still, more isn't automatically better. If you're pregnant, breastfeeding, taking medication or managing a health condition, it's always best to check with your health professional before starting a new supplement.
How to get the most from a biotin supplement
- Think support, not transformation. Set realistic expectations. It's one supportive piece of the puzzle.
- Be consistent. Hair grows slowly (around 1cm a month), so give any routine at least three months before judging results.
- Choose a combination formula. A blend that pairs biotin with zinc, vitamin C and other B vitamins covers more of what hair actually relies on. That's how our Haircarebear Hair Gummies are formulated.
- Mind the basics. Protein, iron, overall nutrition, sleep and gentle hair care matter just as much as any supplement.
The bottom line
Biotin is a real, hair-relevant nutrient, and a biotin supplement is a reasonable way to support healthy hair, especially if your intake is on the low side. Just keep your expectations grounded: it's a supportive nutrient, not a guaranteed growth booster. A balanced diet, consistency and a well-rounded formula will always do more than biotin alone.
Frequently asked questions
Does biotin regrow hair? Biotin can help when hair changes are caused by a biotin deficiency. For people who aren't deficient, there's little evidence it regrows hair on its own, it's better understood as support for normal, healthy hair.
How long does biotin take to work? Hair grows slowly, so allow at least three months of consistent use, alongside a balanced diet, before judging results.
How much biotin do I need? Australia sets an Adequate Intake of 30 µg per day for men and 25 µg per day for women (there's no formal RDI for biotin). Most people meet this through diet; a supplement typically provides more. Always follow the label.
Can I get enough biotin from food? For most people eating a varied diet, yes. Biotin is found in eggs, nuts, seeds, legumes, fish, whole grains and many vegetables, so everyday meals usually cover it, which is why deficiency is uncommon in healthy adults.
Are biotin gummies better than tablets? Neither is inherently more effective. Gummies are simply easier and more enjoyable for many people to take consistently, and consistency is what matters most.
Written by the Haircarebear team. Reviewed by Katie van der Mye, Innovations Manager (BA, MPRA, MM).
This article is general information only and isn't medical advice. Please speak with your health professional about your individual needs.
Sources: dermatology reviews and systematic reviews on biotin and hair outcomes, including the Journal of Drugs in Dermatology (Soleymani et al., 2017), the Journal of Clinical and Aesthetic Dermatology, and 2024–2025 systematic reviews of oral biotin for hair; biotin Adequate Intake from the NHMRC/Eat For Health Nutrient Reference Values (Australia & New Zealand).