US$ 20.19
s-acetyl glutathione bioavailability human study S-Acetyl-Glutathione Attenuates Carbon Tetrachloride-Induced Liver Injury by Modulating Oxidative Imbalance and Inflammation PDF) Oral Administration of S-acetyl-glutathione:
Description
That is the entire human dataset

Adsorptive-mediated transport at the BBB has also been exploited to target nanocarrier systems by using cationic lipids and cell penetrating peptides to increase binding and internalization at the brain capillary endothelium [29, 30], which has a highly negative surface charge [31]

Five pumps (about a gram) onto clean, dry skin face and neck

And thats before asking whether the compound is even what the label says it is
