I noticed my first white hair when I was 18-19. With time I ...

Prompt

I noticed my first white hair when I was 18-19. With time I started noticing more of them, and bigger small batch at age 23. Now I'm 30y old male and ~5% of hair being white. I would like to stop it and ideally reverse it as much as possible. What could be realistically be done. I know that my calcium b12 levels are normal (tested within 1y). Serum Cooper was in the normal but very end low range (tested 2-3y ago). Feritin was at 78.5. Zinc unlikely to be low. Vit D usually fluctuates between low 60-80. Is there anything that could help?