14 In contrast, Weschawalit et al 3 reported a statistically significant effect of glutathione as a skin-lightening agent, but this was limited to a group of participants aged older than 40 years who received GSH, a reduced form of glutathione, on the sun-exposed area of the right forearm
The other 7 bullfrogs were injected into 1.5 mL centrifuge tubes with a 1 mL syringe, and then centrifuged at 4C for 10 min (12000 r/min, 4C) after 24 h
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