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Biotin has become one of the most talked-about ingredients in the world of hair supplements.
Scroll through social media or walk down the supplement aisle and you'll see it everywhere — often marketed with promises of faster growth, thicker hair and dramatic transformations.
But what does biotin actually do?
And, perhaps more importantly, what doesn't it do?
Biotin does have an important role in maintaining normal hair, but many of the claims surrounding it go far beyond what the science actually supports.
So let's separate the facts from the myths.
What is biotin?
Biotin, also known as vitamin B7, is a water-soluble B vitamin that helps the body convert nutrients from food into energy.
It plays a role in several normal processes within the body and contributes to the maintenance of normal hair and skin.
Biotin is naturally found in a variety of foods, and most people eating a varied, balanced diet will obtain adequate amounts through food.
True biotin deficiency is considered rare.
So why has biotin become so closely associated with hair growth?
Partly because hair thinning can occur when someone is genuinely deficient in biotin. Over time, that association has evolved into a much broader message that taking more biotin automatically means better hair.
And that's where things become a little more complicated.
Myth 1: Biotin makes your hair grow faster
This is probably the biggest misconception surrounding biotin.
Biotin is important for normal hair, but that doesn't mean taking additional biotin will make healthy hair grow faster.
Current evidence does not show that supplementing with biotin improves hair growth in otherwise healthy people who are already getting enough.
Think of it this way: if your body already has what it needs, continually adding more doesn't necessarily improve the result.
Hair growth is far more complex than one vitamin.
Genetics, hormones, nutrition, illness, medication, stress, age and scalp health can all influence what is happening with our hair.
So when somebody is experiencing excessive shedding or thinning, simply reaching for a high-dose biotin supplement without considering the reason behind the change may mean overlooking the real issue.
Myth 2: Everyone should take biotin
Not necessarily.
Most people obtain biotin naturally through a balanced diet, and true biotin deficiency is considered rare. If your body is already receiving enough biotin, taking more does not automatically mean better or faster hair growth.
However, that doesn't mean nutritional support has no place.
There can be times when someone's diet, lifestyle, health or circumstances mean their overall nutritional intake isn't quite where it needs to be.
Rather than viewing biotin — or any supplement — as a treatment for hair loss, I prefer to look at the bigger picture.
What is happening with the hair?
What has changed over the previous months?
How is the scalp?
What does their diet look like?
Have there been periods of illness, prolonged stress or restricted eating?
Hair often reflects what has been happening within the body several months earlier, which is why understanding the wider picture is so important.
Supplements can be useful for supporting nutritional intake where appropriate, but they should complement a balanced diet rather than replace one.
Myth 3: More biotin means better results
This is another of the biggest misconceptions surrounding biotin.
More isn't necessarily better.
Biotin is an essential nutrient and contributes to the maintenance of normal hair, but there is currently no good evidence that continually increasing the dose will make healthy hair grow faster or thicker in someone who already has adequate biotin.
This is why I don't believe in the “more must be better” approach to supplementation.
Our Biotin Gummies contain 2,000 μg of biotin per daily serving. Rather than focusing on increasingly high doses, my approach is much simpler: supplementation should be considered as part of the wider nutritional picture, not as a shortcut or miracle solution for hair growth.
Hair health is influenced by many factors, and no single vitamin can override those.
So, when might supplementation have a place?
This is where I think we need to move away from the idea that everyone experiencing hair loss needs the same thing.
They don't.
Someone experiencing increased shedding after illness may have very different needs from somebody experiencing hormonal hair changes, genetic thinning, a nutritional deficiency or a scalp condition.
That's why I prefer to think of supplementation as a way of supporting or bridging nutritional intake where appropriate, rather than treating hair loss itself.
Sometimes the first question shouldn't be:
"What supplement should I take?"
It should be:
"Why has my hair changed?"
Once we understand that, we can make much more sensible decisions about what the hair — and the person — may actually need.
A sensible approach to supplementation
If you're experiencing increased shedding, thinning or a noticeable change in your hair, my advice is always to look beyond the supplement bottle first.
Hair changes can have many causes, including stress, illness, hormonal changes, nutritional factors, medications and underlying health conditions.
Biotin may form part of someone's nutritional support, but it shouldn't be used to mask a problem that needs investigating.
And there is another important point that isn't talked about nearly enough.
If you're taking a biotin supplement and are due to have blood tests, tell your doctor or healthcare professional that you're taking it.
Supplemental biotin can interfere with certain laboratory tests and potentially produce misleading results.
That's not a reason to be frightened of biotin. It's simply another reason why I believe supplements should be used thoughtfully rather than taken on the assumption that more must always be better.
Myth 4: If my hair is shedding, I must be deficient in biotin
No.
Hair shedding does not automatically mean you have a biotin deficiency.
There are many reasons why somebody may suddenly notice more hair coming out — and some of them may have occurred several months before the shedding actually started.
Illness, significant stress, surgery, hormonal changes, nutritional deficiencies, rapid weight loss and certain medications can all potentially affect the normal hair-growth cycle.
Then there are other forms of hair loss, including genetic hair thinning and different types of alopecia, which have entirely different mechanisms.
This is why understanding what type of hair loss or shedding is occurring matters.
Taking biotin simply because hair is falling out doesn't identify the cause.
Hair health is bigger than one ingredient
This is probably the most important message of all.
There isn't one vitamin, shampoo, serum or supplement that can single-handedly create healthy hair.
Hair health is a much bigger picture.
Nutrition matters.
Hormones matter.
Genetics matter.
Stress and illness matter.
The health of the scalp matters.
And understanding what has changed within your body and your life matters too.
Sometimes nutritional support may form part of that picture. Sometimes it won't.
The important thing is understanding the difference.
The bottom line
Biotin isn't a miracle ingredient, and it isn't a treatment for every type of hair loss.
It is, however, an essential nutrient that contributes to the maintenance of normal hair.
For most people, adequate nutrition should always come first. Where supplementation is appropriate, I believe it should be used as exactly that — a supplement to the bigger picture, rather than the answer to every hair concern.
Healthy hair is influenced by nutrition, health, hormones, genetics, lifestyle and scalp condition.
Understanding what your hair actually needs will always be more useful than simply taking more of something because the label promises better hair.
Hair has a story to tell. Sometimes the most important thing we can do is understand what it's trying to tell us.