Copper and gray hair – the little-known link
Gray hair is most often seen as a natural part of aging, but when hair starts turning gray early it is referred to as premature gray hair (typically before 20–25 years of age depending on ethnicity). Several factors are involved: genetics, oxidative stress, autoimmune processes and nutritional status, and among the trace minerals copper is one of the most interesting.
How copper affects hair color and melanin
Hair color is determined by the pigment melanin, which is produced in melanocytes in the hair follicle. A key enzyme in this process is tyrosinase, which converts the amino acid tyrosine into melanin precursors.
Copper is an essential metal cofactor for tyrosinase:
- Tyrosinase contains two copper ions in its active site.
- Without sufficient copper, tyrosinase activity declines and melanin production decreases.
- Less melanin → lighter hair color and, over time, gray or white hair.[web:501][web:506][web:512][web:515]
Copper also participates in enzymes such as superoxide dismutase and lysyl oxidase, which protect hair follicles against oxidative stress and strengthen the structure of the hair shaft.
Studies on copper deficiency and premature gray hair
Several studies have measured trace elements in people with premature gray hair:
- Some studies have found lower serum or hair copper levels in people with premature gray hair compared with control groups.
- Other studies have not seen a clear difference, suggesting that the association does not apply to everyone and is influenced by genetics, other minerals (e.g., the zinc/copper ratio) and lifestyle factors.
Reviews emphasize that:
- copper deficiency can contribute to premature depigmentation by reducing melanin formation,
- but that human data are limited and more well-controlled studies are needed.
