I'am 25 years old, to gain weight i have used protein powder, multi vit. tablets, milk egg regularly also iron tablets.....but still m not able to gain weight. not only for week or some days, i have followed this above things for more than 3 months. and because of this i have certain problems like hair loss, dry skin, little laziness, tired sometimes. sometimes i do follow exercise like surya namaskar and what ever possible excercise at home, i have join dance classes as well. but i do drop more weight but gaining of my weight is soooo hard for me now.