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As a pH adjuster, it's typically used well under 1% though regulatory caps go much higher: 5% in nail cuticle removers and 2-4.5% in hair straighteners

Additionally, your metabolic rate and any existing health conditions can further influence the timing of your dose

EMBO Rep 2006

In one melanoma study, mice exposed to higher NAC doses experienced greater metastatic activity than those given lower doses, suggesting the effect may be dose-dependent in certain experimental settings.42 Researchers have not established whether these findings apply to humans, but starting with a moderate dose offers a more conservative approach while still aligning with a large portion of the clinical literature