Which vitamins andor foods are best to encourage strong and healthy hair growth?

Biotin: Biotin has shown to help create strong and healthy hair and nails.

Healthy hair: For healthy hair growth: Get adequate sleep,avoid excess sugar & fat in diet, v carbonated beverages, eat enough protein, exercise regularly. Biotin helps (but don't over do it). Insure you have adequate Iron (like kale & other dark green leafies), Omega 3 fatty acids (like walnuts) & vitamin E (fruits & vegetables). Avoid sulfates & formaldehyde in shampoos). Avoid excessive blow dry heat.