They may also recommend switching to tranexamic acid, which is a newer cream that has comparable results to hydroquinone in reducing hyperpigmentation
Endogenous glutathione adducts
In animal blood, the glutathione content also varies by species: it is 26-34 mg/100g in human blood, 58-73 mg/100g in chicken blood, and 10-15 mg/100g in pig blood
Chi EY, Krishnan S, Randolph TW, Carpenter JF
That is an important framing for anyone tempted to treat it as a shortcut: even in the animal work that generates the interest, the compound is one input alongside energy balance, not a replacement for it
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