can lactating mothers take glutathione GLUTATHIONE: Is it safe for Breastfeeding MOM? #VanityRealQuick Is Glutathione Safe to Use
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8 BerneckerC.RagginerC.FaulerG.HorejsiR.MllerR.ZelzerS.et al (2011)

The mixture was then agitated at 4 C for one hour and subsequently centrifuged at maximum speed for 10 min

Some medications also contribute to lip pigmentation
The Molecule Glycyl-L-histidyl-L-lysine is a three-amino-acid sequence with a molecular weight of 340.4 daltons