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Mild Tingling on Initial Use: Some users particularly those new to Kojic Acid, Glutathione, or Tea Tree Oil may experience a mild tingling or gentle stinging sensation during the first few uses as the dual-active brightening ingredients begin working on the skin

Andria Caverzan, Independent Researcher, Passo Fundo, Brazil Updates Copyright 2021 Wang, Liu, An, Zhang, Meng, Jin, Huo, Yu and Zhang

Huang C, Santofimia-Castao P, Liu X, Xia Y, Peng L, Gotorbe C, et al

In many cases, yes, but stacking should be done under medical supervision

These results obtained in pastured horses are similar to results obtained by Maylin et al