Many possiblities: This is impossible to answer since protein shakes have many different amino acids, many of which (like taurine, tryptophan and cysteine) may help, and many different vitamins and minerals have the potential to help headaches (such as magmesium and vitamin b6). And it may be no single ingredient but the synergy of several ingredients. See http://bit.Ly/19iszgc for more info...
Answered 12/5/2013
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