glutathione is vitamin or C? Which better for dark spots and dull skin Vitamin C and glutathione supplementation:

Red Flags to Avoid No COA available, or a COA that won't load / is image-only with no lab name Batch numbers that don't match between COA and vial Purity claimed with no supporting HPLC chromatogram Marketing that presents the retracted "seven orders of magnitude more potent than BDNF" figure as settled fact (see the evidence section below) Human dosing instructions or therapeutic claims on the listing a tell that the seller is ignoring RUO rules Vendor copy citing a "12.8-day half-life" as established this figure appears only in vendor marketing, with no verifiable peer-reviewed source A clean COA verifies that the powder is what the label says

Glutathione for brightening (1,000ppm): Shifts melanin synthesis toward lighter Phaeomelanin

Understand proper injection technique before beginning

The WHO recommendations for SAA intake of 13 mg/kg of body weight are in the same range as those suggested by the RDA