Your body produces it on its own, but production declines significantly with age, from roughly 200 ng/mL at age 20 to around 80 ng/mL by age 60
PMID: 16244184
Mittal, M., et al., Reactive oxygen species in inflammation and tissue injury
Wu Q, Wang X, Nepovimova E, Wang Y, Yang H, Kuca K (2018) Mechanism of cyclosporine A nephrotoxicity: oxidative stress, autophagy, and signalings
Allergic Reactions (Rare): Although rare, some individuals can have an allergic reaction to the injection, ranging from a rash or itching to more severe symptoms like swelling of the face, tongue, or throat, dizziness, or difficulty breathing