numbuzin no.5 glutathione vitamin concentrated serum No. 5 000ppm of Niacinamide that brightens the skin by inhibiting the movement of melanin. Numbuzin No. 5 Vitamin Concentrated

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Phase 4: Maintenance (long-term) Once you've identified your optimal concentration, maintenance phase focuses on consistent use with periodic reassessment

A 1987 study on mice determined oral glutathione to be nontoxic,27 and a 2017 toxicity study (also on mice) found that glutathione's LD (the amount of a substance needed to kill 50% of all test animals in one dose) was 5g/kg.6 An equivalent toxic dose for an 80kg human would be 32.5g, which is more than 32 times the highest amounts used in clinical studies