Vitamin B12: benefits for hair?

What is vitamin B12?

Vitamin B12, also known as cobalamin, is a water-soluble vitamin that is essential for the body to function properly. It is found almost exclusively in foods of animal origin:

• meat and offal
• fish and seafood
• eggs
• dairy products

It plays an essential role in a number of recognised biological functions. Vitamin B12:

• contributes to the normal formation of red blood cells
• plays a part in the normal functioning of the nervous system
• supports normal energy metabolism
• helps reduce fatigue

These functions explain why B12 is often mentioned in the context of general vitality, but also, indirectly, hair and skin health.

Some clinical observations suggest that vitamin B12 deficiency may be accompanied by skin or hair symptoms, which has fuelled scientific interest in its potential link with hair follicles.

Against this backdrop, several general reviews are now suggesting the possible involvement of micronutrients (including group B vitamins) in hair disorders (1).

Vitamin B12 and hair: what are the benefits?

Although vitamin B12 is not officially recognised as having an effect on hair health, it is nevertheless involved in key biological mechanisms that may indirectly influence the normal functioning of the hair follicle.

Here's a detailed look at the potential benefits of vitamin B12 for hair.

Plausible biological mechanisms

Physiologically, vitamin B12 is involved in cell division and DNA synthesis, and the hair follicle is among the tissues in the body that undergo the most rapid renewal.

It is therefore conceivable that an adequate intake of vitamin B12 may indirectly contribute to an environment conducive to hair growth, particularly when dietary intake is insufficient.

Another important point to be aware of: by supporting the formation of red blood cells, B12 helps to transport oxygen. Optimal oxygenation of the scalp could play a role in follicle vitality.

A scientific review shows that vitamin B12 status is associated with essential biological mechanisms, notably cellular metabolism and protection against oxidative stress, which contribute to the proper functioning of cells with high metabolic activity, such as those in hair follicles (2).

Vitamin B12 deficiency

Before talking about deficiency, remember that it is normal to lose around a hundred hairs a day, as part of the hair follicle's natural cycle.

However, a vitamin B12 deficiency can accentuate this loss or make the hair more fragile (3). It can also lead to fatigue, nervous problems and skin changes.

Some modern factors, such as H. pylori infection, drugs that modify gastric acidity or excessive alcohol consumption, can reduce the absorption of vitamin B12 in some people (4).

In this sense, the scientific data converge on one point: correcting a vitamin B12 deficiency is essential for the body to function properly. On the other hand, when levels are already sufficient, taking a supplement does not provide any additional benefit for the hair.

Populations at risk of vitamin B12 deficiency are well identified:

• vegetarians and vegans
• older adults (reduced absorption with age)
• people with chronic digestive disorders
• people taking certain medications, such as proton pump inhibitors (PPIs) or metformin (5)

Associated symptoms may include hair loss, the early appearance of grey hair (via mechanisms linked to melanin production) or an overall drop in vitality.

Supplementation: when and how should it be considered?

In the event of suspected vitamin B12 deficiency, a blood test remains the most reliable method before starting any supplementation. Normal concentrations of vitamin B12 in the blood are generally between 100 and 600 pmol/L.

If a deficiency is detected, appropriate supplements can help restore adequate levels.

Why methylcobalamin?

Among the forms available, methylcobalamin is an active form of B12 that can be used directly by the body. It is valued for its high bioavailability, making it ideal for people with intestinal absorption difficulties.

Discover Methylcobalamin, an active form of vitamin B12, involved in energy metabolism and cell synthesis.

Combining B12 with other nutrients: the benefits

Hair health depends on a balanced intake of nutrients: B vitamins (biotin, riboflavin, niacin, thiamine, pantothenic acid, folic acid/B9), zinc, proteins and amino acids.

Brewer's yeast, naturally rich in B vitamins, is often used in hair supplements. Several of its vitamins contribute to energy metabolism and the maintenance of normal hair.

Discover Brewer's Yeast Hair Boost, a formula with a high dose of inactivated brewer's yeast that acts on hair health.

Finally, hair is made up mainly of keratin, a protein produced endogenously.

Targeted formulas can support its synthesis by providing the nutrients involved in the natural production of keratin.

Discover Hair & Nails Formula, a natural formula with a high content of solubilised and patented keratin (Cynatine® HNS).

Please note: a balanced diet, adapted to your lifestyle, remains the primary lever for covering your needs and maintaining healthy hair. Supplements also have their place, but always as part of a balanced and tailored approach.