A
solid supplement composition comprising at least one non-ester
nitrate compound and at least one isolated
amino acid compound, wherein the at least one isolated
amino acid compound is
beta alanine, wherein the at least one isolated
amino acid compound is a separate compound than the at least one non-ester
nitrate compound, and wherein the
solid supplement composition comprises an amount of
nitrate ion (NO3−) that is at least about 1 mg. A semisolid supplement composition comprising at least one non-ester nitrate compound and at least one isolated amino acid compound, wherein the at least one isolated amino acid compound is
beta alanine, wherein the at least one isolated amino acid compound is a separate compound than the at least one non-ester nitrate compound, and wherein the semisolid supplement composition comprises an amount of
nitrate ion (NO3−) that is at least about 1 mg.