US$ 20.86
where does glutathione come from What is Glutathione? Your Cold and Flu Defense
Description
Cosmetics , 2015, 2(3), 236247

EMBO J (1995) 14(6):116675

Dietary supplements have been found to be tainted with drugs or other ingredients not approved by FDA
Its not FDA-approved, and selling it as a drug or supplement in the US isnt legal (source)

First, the price gap is not primarily about concentration a premium serum at 1% may cost more than a budget serum at the same strength because of purity, chelation form, packaging and formulation know-how
