Vitamins and nutritional supplements for hair loss

In this article, we explain the role that nutrition plays in hair health and when vitamins or nutritional supplements may be useful in people experiencing hair loss.

At our Hair Disorders and Hair Transplant Unit, we increasingly see patients who do not have a specific form of alopecia but are concerned that their hair looks dull, feels brittle or seems to shed more easily. Many ask which foods they should eat or whether they should take nutritional supplements to reduce hair loss, make hair grow faster or increase its volume.

The essential point is that there is no single food, vitamin or nutritional supplement that can prevent or cure every type of alopecia. Hair loss is complex and can have many different causes. However, certain nutrients are important for normal hair follicle function, and deficiencies can contribute to changes in hair growth or quality.

The role of nutrition in hair quality

Establishing a direct relationship between individual nutrients and hair loss is complex. Hair follicle function can be affected by many different factors, and nutritional deficiencies do not always produce a specific or unique pattern of hair changes.

It is also difficult to study the effect of individual foods or supplements in isolation. Nutrients interact with one another, their bioavailability varies according to dietary sources and preparation methods, and their effects are influenced by the person’s overall diet, health status and lifestyle. For this reason, nutritional assessment should consider the patient as a whole rather than focus on a single vitamin or food.

How hair forms and grows

To understand how nutrition can affect the hair, it is useful to know how hair is formed. The hair shaft is produced beneath the scalp within small but highly complex structures called hair follicles. Hair follicles go through repeated cycles of growth, regression and rest. The active growth phase, or anagen, can last for several years and varies according to genetic, hormonal and environmental factors.

The visible hair shaft consists largely of keratinised cells that have lost their nuclei. Although the visible part of the hair is biologically inactive, the formation of a normal hair shaft depends on the health and function of the living follicle beneath the skin.

Supporting healthy hair follicle function

Hair, skin and nails can all reflect aspects of general health. Significant nutritional deficiencies can therefore affect these tissues.

Depending on the deficiency and the individual patient, hair may shed more than usual, become more fragile or lose some of its usual density or quality. The skin may become dry or scaly, while the nails can become brittle or develop changes in their surface. However, these signs are not specific to nutritional deficiency and may have many other causes. A medical assessment is therefore important when changes are persistent or significant.

What are nutraceuticals and nutricosmetics?

The terms nutraceuticals and nutricosmetics are used to describe food supplements containing nutrients or other compounds intended to support health or aspects of appearance. They may contain vitamins, minerals, amino acids, botanical extracts or other substances.

Food supplements are regulated differently from medicines. They do not generally need to demonstrate the same level of clinical efficacy required for a medicine to receive authorisation for treating a disease.

For this reason, the scientific evidence supporting claims about hair growth or hair loss varies considerably between products. The fact that a product is described as ‘natural’ or sold as a nutritional supplement does not necessarily mean that it is effective or free from potential adverse effects or interactions.

Nutritional supplements for alopecia

As mentioned above, alopecia is not a single condition. There are many forms of hair loss, with different causes and different treatments. At present, there is no nutritional supplement capable of curing alopecia in general. Supplements may be useful in selected patients when a nutritional deficiency or another specific indication has been identified.

Before taking supplements for hair loss, it is advisable to consult a dermatologist expert in hair disorders. The first step is to establish whether the patient has a specific form of alopecia, telogen effluvium or another cause of increased shedding or hair fragility. Once the diagnosis is established, the specialist can determine whether nutritional assessment or supplementation forms part of the appropriate treatment plan.

Minerals and vitamins for hair loss

Vitamins and minerals are essential for normal cellular function, including the activity of the hair follicle. However, supplementation is generally most useful when there is an identified deficiency or increased nutritional requirement.

Iron is one of the nutrients most frequently assessed in patients with diffuse hair shedding. Low iron stores can coexist with hair loss, particularly in women of reproductive age. Depending on the clinical picture, blood tests may therefore include haemoglobin, ferritin and other measures of iron status. However, iron supplements should not be taken routinely without evidence of deficiency or another medical indication, as excessive iron intake can also be harmful.

Sulphur-containing amino acids. Hair keratin contains sulphur-rich amino acids, including cysteine, which contribute to the structural integrity of the hair shaft through disulphide bonds. Adequate protein intake is therefore important for normal hair production. However, there is limited evidence that supplementing sulphur-containing compounds such as cystine or taurine improves hair growth in people who already have an adequate nutritional intake.

Biotin is involved in numerous metabolic processes and severe biotin deficiency can cause hair and skin abnormalities. However, true biotin deficiency is uncommon, and there is limited evidence that biotin supplements improve hair growth in otherwise healthy individuals without a deficiency. High-dose biotin supplementation can also interfere with laboratory tests, including some tests used to assess thyroid function, cardiac biomarkers and other clinically important parameters. Patients taking biotin supplements should therefore inform their doctor and laboratory team before blood tests.

Vitamin D receptors are present in hair follicles, and vitamin D has been studied in relation to several forms of alopecia. Low vitamin D levels have been reported in association with some hair disorders, but this does not prove that vitamin D deficiency is the cause in every case. When a genuine deficiency is identified, correcting it may be appropriate for general health and may form part of the overall management plan. However, vitamin D supplementation should not be presented as a stand-alone treatment for alopecia without a specific indication.

Are nutritional supplements effective for alopecia?

Nutraceuticals are a rapidly expanding area and many products are marketed with claims relating to hair growth, inflammation or hair loss. However, the strength of scientific evidence varies widely. For this reason, claims that a ‘natural’ product can reverse hair loss or treat inflammation should be assessed critically, particularly when they are not supported by robust clinical studies.

Some botanical extracts, including Serenoa repens and Pygeum africanum, have been investigated for possible effects on androgen-related pathways.

However, the available evidence for their use in androgenetic alopecia is limited and substantially less robust than the evidence supporting established medical treatments. They should therefore not be presented as equivalent alternatives to medicines with demonstrated efficacy.

In selected patients, a nutritional supplement may be used as an adjunct to a broader treatment plan, but this should be based on diagnosis, clinical evidence and individual circumstances.

Diet, hair, skin and nails

Dr Rita Rodrigues, a member of Grupo Pedro Jaén’s Hair Disorders and Hair Transplant Unit, has highlighted the importance of a balanced diet for general health and for maintaining normal hair, skin and nail function. Nutritional deficiencies may sometimes be associated with brittle hair, increased shedding, dry skin or fragile nails. However, these findings are non-specific and should not automatically be attributed to a vitamin or mineral deficiency without appropriate assessment.

A balanced diet should include a variety of fruit and vegetables; pulses; nuts and seeds; whole grains; fish; eggs; dairy products or appropriate alternatives; and lean sources of protein. Highly processed foods, excessive alcohol intake and diets that are unnecessarily restrictive should be limited.

Dietary sources of biotin. Biotin is naturally present in a variety of foods, including eggs, nuts, seeds, whole grains, soya and some vegetables. For most people eating a varied diet, biotin requirements can be met without supplementation.

B vitamins are found across a wide range of foods. For example, vitamin B6 is found in foods such as fish, poultry, potatoes and whole grains; niacin, or vitamin B3, is present in meat, fish, peanuts and whole grains; and pantothenic acid, or vitamin B5, occurs in many foods including legumes, seeds, meat and whole grains.

Omega-3 fatty acids are found particularly in oily fish such as salmon, sardines and mackerel. They form part of a balanced diet, although there is not sufficient evidence to recommend omega-3 supplementation as a specific treatment for alopecia in otherwise well-nourished patients.

Zinc and iron. Dietary sources of zinc include shellfish, meat, dairy products, pulses, nuts and seeds. Iron is found in foods such as meat, shellfish, pulses, nuts, seeds and fortified or wholegrain foods. Plant-derived iron is absorbed less efficiently than haem iron from animal sources, although absorption can be improved when plant-based iron is consumed with foods rich in vitamin C.

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