It is generally well-tolerated, with the following side effects [9][18]: GI symptoms (most common): Nausea, vomiting, diarrhea, and abdominal discomfort, particularly at doses above 1,200 mg/day Sulfurous taste/smell: NAC has a distinct sulfur odor and taste that some find unpleasant Headache: Occasionally reported Anaphylactoid reactions (IV use only): Infusion-related reactions including flushing, itching, bronchospasm, and hypotension occur in approximately 10-20% of patients receiving IV NAC for acetaminophen overdose [18] Upper limit: There is no established UL for NAC
Lyophilized powder form offers long shelf life and easy storage
study used micromolar concentrations in vitro, which corresponds roughly to this topical range when accounting for skin penetration dynamics
GHK-Cu is biphasic across several fibroblast readouts
Like 6 hours
The takeaway: more is not better, and flooding your skin with copper peptides from day one can tip the balance toward demolition over construction