Life Extension manufactures its NAC in cGMP-compliant facilities, third-party tests it for purity and potency, and backs it with a 365-day money-back guarantee
All other products will work fine
Maintenance dosing considerations: Community protocols commonly describe two maintenance approaches after the initial 8-12 week loading phase: (1) reduced frequency at the same dose (e.g., IV once monthly instead of weekly), or (2) transitioning from injectable/IV to high-bioavailability oral (liposomal) for convenience while accepting a modest reduction in peak levels
He, L., Sui, X., Xiao, Y., Ji, P
Nutritional analysis of mushrooms-a summary (A Plant & Food Research, 2015)
NAC has traditionally been a more popular supplement for increasing Glutathione levels in the body due to its ability to be more readily absorbed