Premature Grey Hair: Does Diet Play a Role? What We Know About Copper
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Quick answer: greying is considered premature when it starts before age 20 in people of European descent, before 25 in Asian people and before 30 in people of African descent. Genetics is the main factor, but oxidative stress, smoking and some nutritional deficiencies are also associated with it. Several studies found lower levels of copper, vitamin B12 or ferritin in people with premature grey hair. Correcting a real deficiency is worthwhile, but there is no supplement proven to reverse grey hair.
Why hair turns grey
Hair colour comes from melanin, a pigment produced by cells called melanocytes at the base of each hair follicle. With every new hair cycle, those melanocytes pass pigment to the growing hair. Grey or white hair appears when the melanocytes slow down, produce less melanin or are no longer replaced.
The key enzyme in making melanin is tyrosinase, and it needs copper to work. That is the biological reason why copper is linked to hair colour, and why the European Union authorises the claim that copper contributes to normal hair pigmentation.
The factors behind premature grey hair
| Factor | What we know | Can you change it? |
|---|---|---|
| Genetics | The main factor. If your parents went grey early, you are more likely to | No |
| Oxidative stress | Accumulated oxidative damage in the follicle is associated with the loss of melanocytes | Partly: diet rich in antioxidants, sun protection, no smoking |
| Smoking | Consistently associated with earlier greying in studies | Yes |
| Nutritional deficiencies | Lower copper, vitamin B12, ferritin (iron stores) or calcium found in some groups with premature greying | Yes, if a real deficiency is confirmed |
| Other conditions | Thyroid disorders and some autoimmune conditions are associated with greying | With medical diagnosis and treatment |
| Psychological stress | Animal research shows a plausible mechanism; human evidence is still limited | Partly |
What the studies say about copper and other nutrients
A 2024 review in the Journal of the Pakistan Medical Association brought together the risk factors studied in premature greying. One study found significantly lower levels of calcium, ferritin and vitamin B12 in people with premature grey hair. Another found notably lower copper levels than in controls, but no differences in zinc or iron.
The same review adds an important caveat: correcting these deficiencies has given disappointing results when it comes to recovering hair colour. In other words, a low level may be part of the picture, but supplementing it rarely brings the colour back.
These are mostly small observational studies, which show associations, not cause and effect.
Can grey hair be reversed?
In most cases, no. When greying is genetic, which is the most common case, the melanocytes in those follicles are depleted. There are isolated reports of colour returning after correcting a vitamin B12 deficiency or a thyroid problem, which is why it is worth checking if greying starts very early or comes with other symptoms. But no supplement has been shown to reverse grey hair in healthy people. Be wary of any product that promises it.
What makes sense to do
- Get checked if you go grey very early. Ask your doctor about vitamin B12, ferritin, thyroid function and, if relevant, copper. It is the only way to know whether there is a deficiency to correct.
- Do not smoke. It is the most clearly associated modifiable factor.
- Eat foods rich in copper. Nuts, seeds, legumes, wholegrains, shellfish, cocoa and offal are good sources.
- Protect against oxidative stress. A diet rich in fruit and vegetables and sun protection for the scalp help. Vitamin C, zinc, selenium and copper contribute to the protection of cells from oxidative stress.
- Do not overdo supplements. More copper than you need is not better, and excess zinc can reduce copper absorption. Balance matters.
Where Hair Code fits
Hair Code includes copper, which contributes to normal hair pigmentation, together with biotin, zinc and selenium, which contribute to the maintenance of normal hair, and vitamin C. It does not reverse grey hair, and we do not claim it does. It is designed to support the nutrients your hair needs, as part of a daily routine of at least three months. If you want to understand what else affects your hair right now, read why hair falls out more in autumn.
Frequently asked questions
At what age are grey hairs considered premature?
Before 20 in people of European descent, before 25 in Asian people and before 30 in people of African descent.
Which deficiency causes grey hair?
Studies have found lower levels of vitamin B12, ferritin, calcium and copper in some people with premature grey hair. These are associations, and genetics remains the main cause.
Does copper prevent grey hair?
Copper contributes to normal hair pigmentation, so an adequate intake matters. But taking copper does not prevent or reverse grey hair caused by genetics.
Can grey hair turn dark again?
Generally no. Only in some cases linked to a deficiency or a medical condition has partial recovery been reported after treating the cause.
Sources
- Abbas H, Ali H, Irfan R. Delving into diversity: exploring different risk factors of premature greying of hair. Journal of the Pakistan Medical Association, 2024.
- European Commission. EU Register of nutrition and health claims.
This article is for information only and does not replace medical advice. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle.