Healthy hair growth is influenced by various factors, including nutrition. Here are some of the best vitamins and nutrients known to promote hair growth:

1. Biotin (Vitamin B7): Helps produce keratin, a protein that makes up hair.
2. Vitamin D: Deficiency has been linked to hair loss.
3. Vitamin E: An antioxidant that may promote hair growth.
4. Iron: Essential for hair growth, and deficiency can lead to hair loss.
5. Vitamin C: Helps your body absorb iron and produce collagen.
6. Zinc: Plays a crucial role in hair tissue growth and repair.
7. Vitamin A: Helps in the production of sebum, which moisturizes the scalp.
8. Omega-3 Fatty Acids: Can improve hair density and diameter.
9. Protein: Hair is made of protein, so ensure you’re getting enough in your diet.

While these vitamins are beneficial, it’s important to maintain a balanced diet and consult with a healthcare professional before starting any new supplement regimen. Remember, healthy hair growth also depends on factors like genetics, overall health, and proper hair care.