ghk cu subcutaneous dosing protocol ghk-cu peptide ghk-cu administration subcutaneous GHK-Cu Dosage and Protocol: A GHK-Cu Injection Dosage Chart (50mg)
Description
inhibition of NNMT enzyme activity

NAC and glutathione support antioxidant and detoxification activity in the body.* This product: Take one to two capsules twice daily between meals, or as directed by your healthcare practitioner
Conclusion So, glutathione or L-glutathione which is better

That's a massive range

Glutathione may sting slightly due to its pH, but it can be given IV push instead if needed