I wanted to know is thea any supplement or...

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supplements help in weigh gain

whey protein is very important to gain muscle, you need (1.4–2.0 g/kg) is recommended, our protein intake can come from either food or supplements.
weight gainers are high-calorie products that contain large amounts of carbohydrates and protein. these products can help you gain weight if added to your normal diet, such as True mass
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