For UK-based investigators and biohackers implementing GHK-Cu protocols, rigorous sourcing is the foundation of reliable results
Epithalon and Longevity Animal studies have shown that epithalon can increase longevity in animals and prolong the integrity of the eye retina in rats, while human clinical trials have found that epithalon offers anti-aging effects in elderly human test subjects [4, 5]

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If your initial levels are already low-normal or if you have risk factors (vegan diet, history of pernicious anemia, or long-term metformin use), starting preventive supplementation makes sense