Bcaas are branched chain amino acids consisting of 3 essential amino acids leucine iso leucine and valine they are considered essential amino acids because human beings cannot survive unless these amino acids are present in the diet together they comprise approximately 13 of human muscle tissue phd bcaas contain per recommended daily serving of 15 capsules leucine 3750mg isoleucine 1875mg valine 1875mg the three bcaas are amongst the 9 essential amino acids for humans the other