Muscle building supplements covers those muscle building supplements which do not fit into other categories such as prohormones, testosterone boosters, and creatine. We can consider muscle building supplements as natural anabolics working to boost muscle mass through natural means. Examples of muscle building supplements Includes growth hormone releasers, insulin sensitisers and more. Muscle building supplements are used by bodybuilders to increase whole body muscle anabolism. The use of muscle building supplements will enable athletes to build muscle faster than before while at the same time allow greater utilisation of stored body fat leading to a leaner, more muscular physique. You would buy muscle building supplements whenever you enter a bulking phase to improve nutrient storage or working capacity of muscles.