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Do you have weakness, cough, tiredness
through the day as well. Inspite of taking this you haven;t put on weight. You must try eating carbohydrate
rich diet like bananas, oranges, mangoes, chikoos. Also consume 2 eggs a day. Eat more chicken, lean meat if you are a non-vegetarian. Drink plenty of water and exercise daily. Try this for 2-3 months. If you do not add the pounds, you may visit your Doctor to assess why you aren't putting on weight, like probably Hyperthyroidism
Type I etc.