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Amino acid supplements are usually based on either the full spectrum of the 9 essential amino acids, the branch chain amino acids (BCAA’s) or leucine on its own. Leucine is widely considered to be the key amino acid regarding muscle hypertrophy as without enough present, the other amino acids cannot bond to form the chains which go on to make up muscle tissue. Also very popular as a supplement are BCAA’s, of which leucine is the major component. Research on BCAA’s which are comprised of leucine, iso-leucine and valine, has shown that they are anti-catabolic in that they can actually prevent muscle breakdown. This makes them of particular benefit when used whilst training to protect muscle tissue and start the recovery process before training has ceased. All 9 essential amino acids have also been found to be of benefit in supplemental form, particularly when taken with meals to boost the amino acid content of the food which allows the body to make better use of the whole protein that has been consumed.