Why Grey Hair Happens - and How Science May Soon Turn Back the Clock

New Research Suggests Future Treatments Could Restore Natural Hair Colour Instead Of Covering Greys

Grey hair is more than a cosmetic concern — it drives a multi-billion-dollar global industry, influences how people are perceived, and can significantly affect confidence and self-image.

Globally, the hair colour market was valued at nearly USD 28 billion in 2025, with more than half of all purchases linked specifically to concealing grey hair. In South Africa, demand for hair colour products continues to grow, with spending projected to increase from roughly USD 172 million in 2021 to over USD 228 million by 2028. These figures reflect a growing search for solutions that go beyond temporary colour coverage.

Grey hair is also widespread. By the age of 50, approximately 50–70% of adults have visible greying, while premature greying can appear in some individuals as early as their 20s.

The social and psychological impact is notable. Studies suggest that grey hair can make individuals appear 20–30% older, influencing workplace perceptions, social interactions, and personal confidence. Research has also shown that faces with grey hair are often perceived as more subdued or less vibrant compared with the same faces without grey strands.

Debunking Common Myths About Grey Hair

According to Dr Kashmal Kalan, Medical Director at Alvi Armani, many popular beliefs about grey hair are scientifically inaccurate.

“Many popular beliefs about greying hair are misleading,” says Dr Kalan. “Stress does not turn hair grey overnight, plucking one strand won’t trigger several more, and no supplement or home remedy has been proven to reliably restore pigment. The reality is far more biological — genetics and pigment cell behaviour are the keys we are finally beginning to understand.”

The Science Behind Greying Hair

At the centre of the greying process are melanocyte stem cells (McSCs) located within hair follicles. These cells are responsible for producing melanin, the pigment that gives hair its natural colour.

During youth, these stem cells move within the follicle and continually regenerate pigment-producing cells. Over time, however, many of them become inactive or trapped within the follicle, preventing them from delivering pigment to growing hair strands. The result is grey or white hair.

Recent laboratory studies using mouse models have demonstrated promising developments. Researchers were able to restore pigment production in roughly half of cases by freeing these trapped stem cells, marking a major step toward therapies that could reactivate natural hair colour without the use of dyes.

Emerging Therapies Targeting The Root Cause

Rather than focusing solely on cosmetic coverage, scientists are now exploring treatments designed to address the biological mechanisms behind greying hair.

Areas of research include:

• Topical treatments that stimulate dormant pigment cells
• Metabolic modulators that influence follicle behaviour
• Activation therapies aimed at reawakening melanocyte stem cells

These innovations could potentially allow hair to regain its natural shade, while also supporting overall follicle health and hair vitality.

According to Dr Sunaina Paima, aesthetic and hair-restoration physician at Alvi Armani Johannesburg, the implications could be significant.

“We are witnessing science that was once purely theoretical become reality,” says Dr Paima. “For patients, this could mean seeing grey strands regain their original shade naturally — something the hair science world has long hoped to achieve.”

“The potential impact on confidence and self-esteem is enormous, because this isn’t just about covering colour — it’s about restoring it at a biological level.”

A New Era In Hair Science

While most pigment-restoring treatments are still in development, advances in genetics, dermatology, and biotechnology are rapidly accelerating research in this field.

“For decades, grey hair was seen as an irreversible hallmark of ageing,” adds Dr Kalan. “Today, that assumption is being seriously challenged. We are approaching a point where treatments may rejuvenate hair from the inside out, rather than simply masking the visible changes.”

These breakthroughs suggest that ageing hair may no longer be viewed purely as a cosmetic issue, but rather as a biological process that can be studied, influenced, and potentially reversed.

As research continues, the future of hair science may offer solutions that help people restore their natural hair colour — not just conceal the greys.