Who should avoid using peptides or use them with caution?

Peptides should be avoided by pregnant or breastfeeding individuals due to unknown effects on fetal and infant development. Those with active cancer, autoimmune disorders, compromised kidney or liver function, or severe allergies to injectables should consult a physician before use. People with diabetes or metabolic disorders need careful monitoring, as certain peptides can affect blood sugar levels, and those taking multiple medications should be aware of potential drug interactions.