glutathione dark skin Oral has been everyone on my fyp but does it actually works?! Looking at the data, it’s very modest to be honest. I’d recommend sticking to what we know works fo hyperpigmentation in black Glutathione Brightening Shot – Glow

NAD+ is a critical coenzyme involved in hundreds of enzymatic reactions including glycolysis, the citric acid cycle, and oxidative phosphorylation, as well as serving as a substrate for NAD+-consuming enzymes including sirtuins, PARPs, and CD38

The majority of research is preclinical (animal studies)

Jahan MS, Nozulaidi M, Khairi M, Mat N (2016) Light-harvesting complexes in photosystem II regulate glutathione-induced sensitivity of Arabidopsis guard cells to abscisic acid

Wistuba II, Salazar R, Solorzano JL, Solis L, Behrens C, Mino B, Parra ER, Zhang J, Vaporciyan AA, Rice DC , Kalhor N, Moran C, Gibbons DL, Weissferdt A, Sepesi B

The antioxidant epigallocatechin gallate (EGCG) moderates the deleterious effects of maternal hyperthermia on follicle-enclosed oocytes in mice