1. Optimum nutrition (ON) serious mass gainer is an ultimate supplement for rapid weight gain. It includes
Rich amount of calorie, Crabs, and Protein.
2. Use this supplement as a pre-workout supplement for the effective results.
3. Each serving includes 1250 calorie mixed with water, 1640 calorie mixed with skimmed milk. Besides this
it also provides 250g of carbs and 50g protein