I am 17 years, 170 m, 55 kg, i have hair loss, is there any specific diet i should follow or any vitamins i should take, i also have dandruff ?

Hair loss : You need to eat healthy balanced diet, high in protein, take multivitamins such centrum for young men, use nourishing, moisturizing shampoo, use hot oil treatments , if no improvement please see your doctor. Good luck.

Manage your dandruff: Aggressively. See if you can use a basic dandruff shampoo alternating with ketoconazole. You'll need to get physician guidance here. If after getting the dandruff cared for, you still have hair loss at age 17, have a dermatologist evaluate you. I trust you are euthyroid. Food choices / diet has little to do with most health issues despite all the huckstering. Good luck on managing this.