glutathione application on skin Injections Glutathione Serum Deep Dive –

However, when oxidative stress becomes prolonged and cellular systems are no more able to counteract the oxidative-mediated insults, the amount of free GSH decreases leading to irreversible cell degeneration and death

The production of EPS increased significantly during the first 14 h and reached a maximum value of 482.728 12.304 mg/L at 20 h, but then decreased as fermentation progressed further (Figure 5A)

PMID 8591048

You can acquire it through supplements or choose supplements that boost production

(By the way, you can read more about NAC and other options for glutathione supplementation, along with safety guidelines and best practices in What to Avoid When Taking Glutathione)