numbuzin glutathione No.5 Vitamin Concentrated Serum, 1.01 fl oz (30 ml) The pads are impregnated with a balanced Numbuzin - No.5 Vitamin-Niacinamide Concentrated

Bioavailability: NAC has an oral bioavailability of approximately 6-10% due to extensive first-pass metabolism, but the deacetylated cysteine that reaches tissues effectively drives glutathione synthesis [9]

And that answer has not changed after reviewing the literature

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Im satisfied with the product

Ive used the ghk-cu serum for the last 3 weeks, as directed

Long-term effects beyond this window remain largely unknown