1. Hair graying results from complex interactions of biological, genetic, and environmental factors.  
2. Melanocytes produce melanin, essential for hair pigmentation.
3. Oxidative stress, genetic variations, psychological stress, hormonal imbalances, nutritional deficiencies, medications, and environmental exposures contribute to graying.
4.  Antioxidant supplementation, stress management, nutritional correction, and experimental approaches are being investigated for treating graying hair.
5. Cosmetic hair dyes remain the most common method for covering gray hair.

Source: Clinical, Cosmetic and Investigational Dermatology