US$ 22.51
reduced glutathione supplementation Pure Encapsulations | Hypoallergenic Antioxidant Supplement to Support Liver and Cell Health* BioCare Reduced Glutathione | Amino
Description
Even if you heat it to 370 C (698 F) for 96 hours, it does not budge

Theres something you might like to know however, that list of symptoms above is taken from the NHSs webpage on the Long-Term Effects of COVID-19 Remarkable isnt it

However, on the second day, the GSH levels in both EI and EF roots were higher than in the control

For those looking for alternatives, calcium AKG, curcumin and S-acetyl glutathione are excellent options, but make sure to speak to your doctor before adding them to your diet
