Introduction: Bodybuilding supplements consists of various substances including proteins and amino acids, metal replacement products, prohormones, testosterone boosters and are taken by boy builders and sports persons to help building muscle or supplement fat loss. These bodybuilding supplements are also suitable for improving sports performance. Amino acids, Branched chain amino acids, glutamine and protein: Protein consumed by our body metabolizes into amino acids. The bodybuilders prefer most commonly three branched chain amino acids leucine, isoleucine and valine. Muscles metabolize these branched chain amino acids. Additionally these branched chain amino acids are assumed to have resistance towards muscle breakdown. Although soy protein, a naturally occurring complete protein may sometime exhibit estrogenic activity and is therefore avoided by many of the bodybuilders, however egg protein is preferred as it is also a complete protein. Casein, another richest protein source of amino acid glutamine is preferred as it contains casomorphine additionally, which releases amino acids at regular intervals. Bodybuilders prefer to take protein just after exercise or as a replacement of meal. Protein powders are available in the market and right quantity of these at recommended helps in making muscles, as muscles are primarily made of protein and protein also helps us in repairing and growth of muscles. Whenever you purchase a protein packet, you must look for total serving in the pocket and gram protein, gram carbs, gram sugar and gram fat per servings. If you are lactose intolerant, you should select a protein packet, which does not contain lactose. On the basis of all these information you must select the right product suitable for you. Metal Replacement Products: The metal replacement products are either available in powder form or in bar form. Powder form can be mixed with water, milk or juice and can be taken thereafter, however bars can be consumed straight away. These are made available for complete meal replacement and contains high amount of proteins, moderate amount of carbohydrates and also contains various vitamins and minerals. Various manufacturers of metal replacement products claim to have added soy protein, egg albumin, whey protein or micellar casein as source of protein. For replacement of carbohydrates ingredients derived from oat fiber, wheat flour or maltodextrin have been added. Some may contain essential fatty acids substitute and other mineral substitutes. Some other products such as glutamine peptide and additional amino acids are also added by some of the manufacturers. Creatine Monohydrate: Creatine monohydrate is one of the essential organic acids. It is one of the few products suitable for making healthy muscles. Creatine monohydrate is useful for sports persons engaged in weight lifting and short-range sprinters. Creatine monohydrate works in our body and plays a vital role in making and replenishing of ATP. It is also occurs naturally in beef, pork, and salmon. If you are on creatine, you may notice a weight gain as creatine has a volumizing effect and draws water and various other nutrients to muscle cells. Some of the common and minor side effects associated with intake of creatine include stomach upset and gastrointestinal distress. Although, some of the recent studies on creatine shows that it has a positive influence on our heart health and it lowers our lipid profile. Prohormone Supplements: Prohormones are precursors to both male and female hormones. Body builders are only interested in the supplements capable to increase male hormone testosterone as at elevated level testosterone will lead to improved muscle growth. Studies carried out on various prohormone have not given the desired results. Some of the horhormone are not significant and effective and may have side effects.