glutathione and melanin synthesis (Raper–Mason pathway). Role of in L-Glutathione Whitening Skin Lightening Dark
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Lennicke C, Cochem HM (2021) Redox regulation of the insulin signalling pathway

Insulin-like growth factor (IGF)-binding protein 5 forms an alternative ternary complex with IGFs and the acid-labile subunit
's_Orthopaedic_Surgery_Chapter_273 Accessed June 26, 2019

N-Acetyl Cysteine is one of my favourite supplements for increasing intracellular glutathione