Can Spermidine Reverse Grey Hair? Scientific Insights Explored

Grey hair is a natural part of ageing, but have you ever wondered whether it is possible to restore your hair's original colour?

Hair turns grey when melanocytes, the cells responsible for producing melanin, gradually lose their ability to make pigment. Your hair follows three main growth phases:

• Anagen: The active growth phase, when hair grows and receives pigment.
• Catagen: A short transitional phase when hair growth slows.
• Telogen: The resting phase before the hair eventually sheds.

Why Does Hair Turn Grey??

Your natural hair colour depends on melanin produced by melanocytes within hair follicles. There are two main types:

• Eumelanin: Responsible for black and brown hair colours.
• Pheomelanin: Contributes to red and yellow hair tones.

As you age, pigment-producing cells and their stem-cell reserves change, gradually reducing melanin production. This causes newly growing hair to appear grey or white.

According to a 2024 scientific review on premature hair greying, genetics, oxidative stress, nutritional factors, and certain medical conditions may contribute to early pigmentation loss.

Spermidine for Grey Hair: What Does the Research Show?

1. Can spermidine increase melanin production?

A 2022 study in Scientific Reports found that spermidine increased melanin in cultured human melanocytes and a laboratory-made human skin model. It also helped stabilise proteins involved in pigmentation.

The limitation: The researchers did not give spermidine capsules to people with grey hair or demonstrate repigmentation of human scalp hair. An earlier 2021 cell study also investigated melanin-related pathways, but it cannot establish a real-world hair-colour benefit.

2. What about hair growth?

In a 2017 randomised study, 100 adults received a spermidine-based nutritional supplement or a placebo for 90 days. The supplement group had more follicles in the active growth phase.

That is worth investigating, but hair growth and hair colour are different outcomes. The trial did not measure whether grey strands turned dark again. An earlier human hair-follicle laboratory study likewise examined growth-related activity, not reversal of greying.

Intrinsic Factors

Intrinsic factors are biological and genetic influences that affect hair pigmentation.

• Ageing: Melanin production gradually declines as you age, causing hair to turn grey or white.
• Genetics: Your family history largely determines when you start developing grey hair.
• Health conditions: Nutritional deficiencies, thyroid disorders, and certain autoimmune conditions may contribute to premature greying.

Extrinsic Factors

Extrinsic factors are environmental and lifestyle influences that may affect hair health.

• UV Radiation and Pollution: Environmental exposure may increase oxidative stress and damage cells involved in hair pigmentation.
• Smoking: Tobacco-related oxidative stress can affect melanocytes and is associated with premature greying.
• Chemical Exposure: Frequent hair dyeing, bleaching, and heat styling can damage hair fibres, although their direct role in causing premature greying is not well established.

Can Grey Hair Turn Black Again Naturally?

A 2021 human study documented instances of greying and repigmentation occurring alongside changes in psychological stress. However, that does not mean ordinary age-related greying can reliably be reversed.

What Can You Do About Premature Greying?

• Check possible deficiencies: Ask a dermatologist about testing if greying is unusually early, sudden, or accompanied by other symptoms. Do not take high-dose minerals without a reason.
• Build balanced meals: Include enough protein, legumes, leafy vegetables, nuts and seeds. Start with our guide to balanced eating.
• Manage your routine: Avoid smoking, prioritise sleep and find workable ways to manage stress. These support general health, not guaranteed recolouring.
• Explore food sources: Wheat germ, soybeans and mushrooms contain spermidine. Our food-versus-supplement comparison explains the difference.

What the Evidence Means for Your Hair

Research gives us good reasons to investigate spermidine further, particularly its effects on pigmentation-related proteins. It does not yet give us a reliable way to bring back your natural hair colour. If you notice premature greying, look for treatable causes first and keep your expectations grounded in human evidence.

FAQs

Does spermidine reverse gray hair permanently?

No human clinical trial has shown that spermidine permanently restores grey hair.

How long does spermidine take to change grey hair?

There is no proven timeline because clinical trials have not shown that oral spermidine changes grey hair colour.