This happens because activating melanocyte receptors (MC1) stimulates melanin production
Oral glutathione especially effervescent forms is generally very well tolerated
10.1016/j.ejphar.2023.175684 154 WuH.-P.YangF.-C.LinH.-D.CaiC.-Z.ChuangM.-J.ChiangK
First, digestion redirects blood flow from the oral mucosa to the GI tract, reducing the efficiency of sublingual uptake
doi: 10.1021/jacsau.2c00130 de Bray A, Roberts AG, Armour S, Tong J, Huhn C, Gatin-Fraudet B, Romann K, Shilleh AH, Jiang W, Figueredo Burgos NS, Trott JPP, Viloria K, Nasteska D, Pearce A, Miyazaki S, Tomlinson JW, Owen DM, Nieves DJ, Ast J, Cyranka M, Epanchintsev A, mml C, Reimann F, Soykan T, Ladds G, Adriaenssens AE, Trapp S, Jones B, Broichhagen J, Hodson DJ