It contains Glutathione, Vitamin C, and Niacinamide, ingredients known for helping brighten the skin and improve the appearance of uneven skin tone
Best practices: Start low and increase gradually to minimize GI side effects

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Diehl JW, Berk DR, Ney A, Bayliss SJ
Green may keep them on Accutane for an additional month to ensure full clearance
So, for a 1000 mcg dose, you need 1 mL