Biotin is undoubtedly the most important vitamin for the health and general condition of hair.
It contributes to the maintenance of normal hair by several mechanisms:
It has been proven that a biotin deficiency leads to an alteration in the hair cycle, temporary hair loss and more fragile hair (1).
Several foods contain good quantities of biotin: brewer's yeast, offal, royal jelly, boiled eggs, wheat bran, lettuce, wholemeal bread, etc.
This B vitamin (known as 'vitamin B8', 'vitamin B7' or 'vitamin H' depending on the country) is also regularly recommended in the form of food supplements to maintain or restore healthy hair.
There are generally two types of options: standalone biotin supplements (such as Biotin) and more comprehensive hair-specific formulas (such as the Brewer's Yeast Hair Boost formula, the classic Hair & Nails Formula or the Hair Growth Booster supplement).
Researchers have discovered that vitamin D also plays a role in balancing the hair cycle.
They have identified vitamin D receptors on keratinocytes, the hair follicle cells that produce keratin. Any genetic mutation affecting these receptors leads to early alopecia and a shortening of the hair growth phase (2).
At least two action mechanisms are being investigated for this vitamin:
Unlike other vitamins, vitamin D can be produced directly by the body under the effect of the sun's ultraviolet rays.
To obtain more vitamin D, you can also increase your intake of the few foods that contain it: swordfish, eel, salmon, red tuna, herring, trout, halibut, raw egg yolk, cow's milk, fortified soya drinks, etc.
However, vitamin D deficiency is extremely widespread (more than one person in two lacks vitamin D in Europe and North America), and vitamin D supplementation is becoming more widespread.
It's best to opt for supplements in the form of oily capsules, to be taken daily for their high absorption, stability and tolerance (such as Vitamin D3 5000 IU or the vegan version Vegan D3), rather than drinkable solutions in ampoules.
Vitamin E is a powerful antioxidant, meaning it helps protect cells from oxidative stress, a form of damage that contributes to ageing.
According to studies, this property allows it to act in multiple ways in the scalp area (3):
Foods rich in vitamin E include nuts, seeds, vegetable oils (preferably unrefined) and green leafy vegetables. However, you should consume sources of vitamin E in moderation, as it is mainly found in fatty foods.
One of the most effective ways of countering the effects of oxidative stress is to take higher doses of vitamin E food supplements.
Choose natural vitamin E supplements rather than synthetic ones, as they are better absorbed and remain in the tissues for longer. Supplements containing several forms of vitamin E (such as Annatto Tocotrienols) also appear to be more effective.
In the body, vitamin A comes in many forms, such as retinol (in the retina) and retinoic acid (in mucous membranes).
This vitamin appears to have several decisive roles in hair health and the hair cycle (4).
A vitamin A deficiency can lead to hair problems: dry scalp, slower hair growth, hair loss, etc.
Make sure you eat natural sources of vitamin A (offal, meat, fish, whole milk, butter, eggs, cheese, etc.) or provitamin A (carrots, apricots, mangoes, dark green vegetables, sweet potatoes, etc.) regularly, but not excessively.
However, avoid excessive vitamin A supplementation (too much or for too long), which could paradoxically lead to hair loss and a reduction in the function of the sebaceous glands. To minimise the risk of overdosing, choose forms such as beta-carotene (by taking the Carottol™ supplement, for example).
Vitamin C or ascorbic acid plays a part in:
Vitamin C can be found in food sources such as citrus fruits (oranges, lemons, grapefruit, etc.), strawberries, kiwi fruit, red peppers, broccoli and spinach.
It is also found in larger quantities in dedicated vitamin C supplements (such as Asc2P).
In addition to the 5 vitamins mentioned, other nutrients and compounds can play a crucial role in maintaining hair vitality, shine and strength:
Some synergistic dietary supplements make life easier for you by combining biotin with several valuable micronutrients and plant extracts for maximum effectiveness (again, the brewer's yeast-rich Brewer's Yeast Hair Formula, the famous Hair & Nails Formula, the Keranat™ 'anti-hair loss' formula, the 'hair growth' supplement Hair Growth Booster or the general beauty formula Daily Beauty).
To better understand the role of vitamins in relation to hair, we can take a closer look at the normal hair cycle, which lasts on average 3 to 5 years and is not synchronised with the hair as a whole. It comprises 3 distinct phases:
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