Here is a list of some of the ingredients -
L-Leucine (BCAA) 8580 mg
L-Isoleucine (BCAA) 5340 mg
L-Valine (BCAA) 5450 mg
L-Lysine 6880 mg
L-Methionine 1600 mg
L-Phenylalanine 4875 mg
L-Threonine 4090 mg
L-Tryptophan 1250 mg
L-Alanine 4010 mg
L-Arginine 5985 mg
L-Aspartic Acid 10300 mg
L-Cystine 1250 mg
L-Glutamic Acid (glutamine and precursors) 19425 mg
L-Glycine 3425 mg
L-Histidine 2490 mg
L-Proline 6330 mg
L-Serine 4900 mg
L-Tyrosine 4000 mg
Perhaps the L - ARGININE??
I used to use the old version of Elite Dymatize protein but I don't recall feeling tingly!! The Blueberry and Banana Nut Muffin are the bomb