Glutathione 500 mg (Nutricost, 240 softgels/caps)
Antioxidant · Generally budget vs. peers; independent test round found ~114% of stated potency.
Strength
Met/exceeded label claim in dual-lab NOW testing (HPLC; NOW + Eurofins/Alkemist).
Weakness
No public batch COA; not NSF Certified for Sport.
Evidence
NOW Foods market test table lists Nutricost at 519–551 mg vs. 500 mg claim (~114%). 5.
Solid value pick for glutathione among mass-market options, with independent spot-verification.