glutathione reduce tyrosinase Approaches to Identify Inhibitors of Melanin Biosynthesis via the Quality Control of Glutathione Benefits for Skin: Brightening,
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Molecules 25 (9), 2187

If the Clock Method does not work, try the Bracketing Method

Annexin A5 ameliorates traumatic brain injury-induced neuroinflammation and neuronal ferroptosis by modulating the NF-B/HMGB1 and Nrf2/HO-1 pathways

Thus, both these techniques give concentrations of the same order, regardless of potential problems such as cross-contamination between compartments or fractions during sample preparation
