david klow Inspiration for the Weary Therapist - A Practical Clinical Companion by (UK edition, paperback) Peptide Therapy for Injury Recovery:

Injectable and implantable contraceptivesincluding the IUD, implant, and injectionbypass the digestive system entirely, making them unaffected by tirzepatide-related nausea or diarrhea

The ATP synthase assembly factors ATP11 and ATP12 are required to protect the hydrophobic surfaces of the unassembled and subunits of the F 1 complex, preventing them from aggregating within the mitochondrial matrix

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In the clinical study, the glutathione amino acid precursor treatment restored GSH/glutathione disulfide levels after UV treatment, confirming its in vivo GSH-boosting effects

Beyond that, the safety data comes from anecdotal reports in the peptide community