Mass gainers are calorie-rich, mostly containing carbohydrates, fats, and less protein. High calories cause weight gain. Mass gainers can be a perfect staple for individuals with high BMR who struggle with weight gain.
Several Animal and human studies suggest that whey protein assists in weight loss. However, excess protein intake can cause weight gain due to gluconeogenesis as extra protein is converted into glucose and fat.
Vitamin B12 contains mineral cobalt, which exists in active and inactive forms. Methylcobalamin & 5-deoxy adenosylcobalamin are active, while hydroxocobalamin and cyanocobalamin are inactive and must be converted into active forms to perform certain functions.