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One or more of the above objects can be achieved, at least in part, by orally administering to an individual in need thereof an effective amount of a direct precursor of glutathione, S-acetyl-glutathione (SAG), in a delayed release delivery form that is orally bioavailable to achieve a significant elevation in circulating glutathione levels

Mylott Jr, Reviews in Separation Sciences, 1(1), 47-55 (2019)

CoQ10 bioavailability varies substantially by formulation, which may partly explain inconsistent behavioral findings across trials

These drops being advertised online are not approved by the Food and Drug Administration (FDA) and can cause significant eye damage