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Structural modifications allow them to stay in circulation for hours or even days: IGF-1 LR3 : 2030 hour half-life CJC-1295 with DAC : 58 day half-life PEG-MGF : detectable for up to 12 weeks Pharmacokinetic enhancements such as PEGylation or fatty acid acylation extend the peptides residence time, reduce renal clearance, and improve therapeutic utility. Veronese & Mero, BioDrugs What Determines How Long Peptides Stay in Your System

Estrogen also plays a role in oxidative stress, a condition in which there is an excess of reactive oxygen species (ROS) that can damage cells and tissues

However, there were no significant differences in enzyme activity and GSH concentrations in dependence from smoking cigarettes

Ozempic is a GLP-1 medication used for diabetes and weight loss with a different mechanism

it is not a peptide