I have read that the precursor NAC combined with Glycine is more effective than taking even liposomal Glutathione. The latter is easily broken down into its constituent parts.
In addition the combination has found its way into the longevity community.

Glycine and N-acetylcysteine (GlyNAC) supplementation in older adults improves glutathione deficiency, oxidative stress, mitochondrial dysfunction, inflammation, insulin resistance, endothelial dysfunction, genotoxicity, muscle strength, and cognition: Results of a pilot clinical trial - PubMed

New NAC & Glutathione Paper Shows 24% Lifespan Extension - YouTube

Thanks again for wonderful content.