Q: Which specific vitamins and minerals are most important for hair growth? A: Your hair roots are among the fastest-growing cells in your body, and they require a lot of specific fuel. The most crucial ones are: • Iron (Ferritin): Helps red blood cells carry oxygen directly to your hair roots. • Vitamin D3: Wakes up dormant hair follicles and triggers new growth phases. • Vitamin B12 & Biotin: Help produce keratin, the primary protein that makes up your hair strand. • Zinc: Repairs hair tissue and keeps the oil glands around the follicles working perfectly.