Why Some People Get Grey Hair Earlier: Science, Stress & Scalp Sensitivity Explained

Grey hair is a natural part of ageing—but for many people, it arrives much earlier than expected. If you’ve ever wondered why some individuals start greying in their 20s or 30s while others maintain their natural colour far longer, the answer lies in a mix of genetics, lifestyle factors, and scalp health.

In this Discovery guide, we break down the latest science behind premature greying and explain how scalp sensitivity, inflammation, and stress may accelerate the process.

1. Genetics: The Strongest Predictor of Early Grey Hair

The timing of greying is largely inherited. Research shows that specific genetic markers determine when melanocyte activity—the cells responsible for pigment—begins to decline. If your parents or grandparents greyed early, there’s a high chance you may follow a similar timeline.

But genetics explain “when”—not necessarily “how fast.”

2. Stress Can Disrupt Melanin Production

Chronic stress doesn’t just affect mood and sleep—it can influence pigment loss. Studies from Harvard and NIH show that stress triggers the release of norepinephrine, which interferes with melanocyte stem cells in the follicle.

• Increased oxidative stress in follicles
• Higher inflammation around the scalp
• Accelerated depletion of pigment-producing cells

While stress alone won’t turn hair grey overnight, it can speed up the natural greying process, especially in individuals already predisposed genetically.

3. Scalp Sensitivity & Inflammation May Play a Hidden Role

The scalp is an extension of the skin—and when it’s inflamed, irritated, or overly reactive, it may contribute to premature colour loss.

Common triggers of scalp inflammation include:

• Harsh hair dyes (especially PPD-based formulas)
• Allergic reactions and fragrance sensitivity
• Eczema, dermatitis, or barrier damage

Inflammation increases oxidative stress around the follicle, which can disrupt melanocyte activity over time.

This is why individuals with sensitive or reactive scalps may experience faster colour changes—even if greying has a genetic baseline.

4. Nutrition & Lifestyle Factors

Certain deficiencies have been studied for their association with early greying:

• Vitamin B12 – important for pigment and nerve function
• Copper – supports melanin synthesis
• Vitamin D – linked to scalp health and immune balance
• Antioxidants – help protect hair follicle cells

While supplements cannot reverse greying, improving nutritional balance may help slow further pigment loss.

5. Can Early Greying Be Slowed?

While greying cannot be stopped entirely, you may slow its progression by supporting follicle and scalp health:

• Reduce stress exposure and improve sleep consistency
• Switch to PPD-free, fragrance-free hair colour systems
• Strengthen scalp barrier with gentle, non-irritating products
• Improve antioxidant intake through diet

Understanding your scalp’s sensitivity is key—calming irritation may reduce oxidative stress around the follicle environment.

6. A Gentle Way to Refresh Grey Without Stressing the Scalp

If you want to soften or blend grey hair without harsh chemicals, consider an option designed specifically for sensitive scalps. PPD-free, ammonia-free, and fragrance-free systems provide colour refresh without the irritation that may worsen inflammation.

For a gentle approach to grey coverage, explore our Gray Hiding Treatment, designed to deposit soft colour while keeping the scalp calm.

Conclusion

Early greying is influenced by a combination of genetics, stress, scalp reactivity, and overall lifestyle. While you cannot fully prevent it, focusing on scalp comfort and gentle hair-care choices can support healthier ageing and more predictable colour changes over time.