While compounded drugs are not FDA-approved (as the FDA approves mass-manufactured brands, not individual recipes), the practice itself is legal and regulated
Ozmen F, ahin TT, Dolgun A, et al
The samples are subjected to processes including sedimentation and red blood cell lysis, followed by a brief period of cultivation for further analysis
So rather than focusing on the label alone, its more useful to look at the full picture
doi:10.1186/1472-6750-11-8 Ueda Y, Yonemitsu M, Tsubuku T, Sakaguchi M, Miyajima R (1997) Flavor characteristics of glutathione in raw and cooked foodstuffs
Ultimately, the radical chain reactions will be blocked by the antioxidant enzymes superoxide dismutase (SOD) in association with catalase or GPX that determines the complete free radicals scavenging (Winterbourn, 1993)