I, however, do not encourage the use of steroids to gain muscles fast because they come with very many side effects some of which are not reversible.   OptiMemory The secrets of how to gain muscle fast  For you to be able to gain muscle fast you need to increase your calorie intake. Calories are used as fuel for the body. Your body requires all the energy and power it can get so that it can be able to sustain intense training. The best source of calories are carbohydrates, other sources include proteins and healthy fat. In order to gain muscle fast you need to also include plenty of proteins in your diet.

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