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Age is another factor to consider

Certain peptides are used in regenerative and integrative medicine to help support functions such as tissue repair, inflammation balance, metabolic support, and recovery after physical stress or injury

Body weight may influence dosing for some compounds (especially weight-based dosing for FDA-approved indications)
Influence of size, shape and capping agent

Remove other peptides temporarily to isolate whether GHK-CU specifically causes your issues
