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ghk-cu plasma levels decline with age Copper Peptide Regeneration Review (2018) — Research Summary Effects of age on concentrations
Description
Not catastrophic, but worth noting

The work of Bock-Marquette and collaborators (2004) demonstrated the cardioprotective effect of thymosin beta-4 in a murine model of myocardial ischemia, a finding confirmed by several independent teams

(10) Research suggests that deficiencies of vitamin B12 can decrease energy and exercise tolerance, along with causing fatigue and shortness of breath

an example of which is tendon healing
