This is why many early studies on oral glutathione showed inconsistent results, and why the Healthy Aging collection is often a useful place to explore supportive formulas
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GHK-Cu is the naturally occurring version used for both skin and hair
Gastroenterology 122 , 366375 (2002)
Irregular Heartbeat or Palpitations Some individuals may notice changes in heart rhythm, including a racing heartbeat or palpitations
Plus, many of them also contain ingredients that may negatively affect health, such as taurine, L-carnitine, various herbs, large doses of some vitamins, and added sugar or sugar substitutes