Close this search box.

Can Amino Acids Cause Hair Loss?

Amino acids do not cause hair loss. Instead, they support hair growth and health by forming the building blocks of proteins like keratin.

Amino acids are essential for hair health. They form the building blocks of proteins, including keratin, which makes up most of the hair. Understanding their role can help in managing hair loss and promoting hair growth.

Role of Amino Acids in Hair Health

Amino acids are crucial for hair health. They form keratin, the primary protein in hair. Keratin gives hair its structure and strength. Without enough amino acids, hair can become frail and prone to breakage.

There are 20 standard amino acids, nine of which are essential. Essential amino acids must come from the diet. Non-essential amino acids can be synthesized by the body. Both types are essential for hair health.

Cysteine and methionine are particularly essential. Cysteine helps form disulfide bonds, which give hair its strength and elasticity. Methionine is an antioxidant that prevents hair damage. According to a study, these amino acids can improve hair health and prevent hair loss.

Amino Acids and Hair Growth

Amino acids support hair growth by promoting the health of hair follicles. Lysine, for example, helps with the absorption of iron, which is crucial for hair growth. A study found that lysine and iron supplementation improved hair growth in women with hair shedding.

Phenylalanine and its derivative, tyrosine, also play a role. They support the production of thyroid hormones, which regulate hair growth. According to a study, phenylalanine can help treat hair loss caused by thyroid dysfunction.

Amino Acids in Hair Care Products

Many hair care products contain amino acids. These products can help strengthen hair and prevent damage. For example, shampoos and conditioners with amino acids can improve hair’s moisture retention and elasticity.

Products with hydrolyzed collagen, which contains amino acids, can also support hair health. A study found that supplements with hydrolyzed collagen and amino acids improved hair growth in people with androgenic alopecia and telogen effluvium.

Dietary Sources of Amino Acids

A balanced diet is essential for getting enough amino acids. Foods rich in amino acids include meat, fish, eggs, dairy products, legumes, and nuts. These foods provide the building blocks needed for healthy hair.

Complete proteins, which contain all essential amino acids, are particularly beneficial. Examples include eggs, quinoa, and soy products. Including these in your diet can support hair health and growth.

Research on Amino Acids and Hair Loss

Research on amino acids and hair loss is ongoing. Some studies suggest that amino acid supplementation can improve hair health. For example, a study found that cysteine supplementation increased hair growth in a miniature group of participants.

However, more research is needed to fully understand the relationship between amino acids and hair loss. Current evidence suggests that amino acids support hair health rather than cause hair loss.

Key Takeaways

  • Amino acids are essential for hair health and growth.
  • They form the building blocks of keratin, the primary protein in hair.
  • Cysteine and methionine are particularly essential for hair strength and elasticity.
  • Amino acid supplementation can improve hair health in some cases.
  • A balanced diet rich in amino acids supports healthy hair.


Amino acids do not cause hair loss. Instead, they play a crucial role in maintaining hair health and promoting growth. Including amino acids in your diet and hair care routine can help keep your hair solid and healthy. While more research is needed, current evidence supports the benefits of amino acids for hair health.