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Glutathione is a naturally occurring antioxidant in your body, but as you age, production levels decline
Some people with sensitive skin may need to take breaks regardless of whether they use retinol regularly
Increase after 2-4 weeks if tolerated well and results warrant more
If you want a standalone reduced glutathione product without the extras, this is the benchmark
PCO-02 - Safety and Pharmacokinetics Trial
Pickart, L., et al
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