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Some peptides are designed to boost growth hormone levels for anti-aging and muscle recovery and growth, others support fat loss or tissue repair, while some target cognitive health, immune resilience, or even sexual wellness

only the first amino acid differs ( glycine in GHK-Cu vs alanine in AHK-Cu)

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This placebo controlled study in 24 elderly individuals showed that a single dose of an NAD+ booster before exercise improved fatigue index, physical recovery, and muscle function

For an avascular structure like a disc, even modest improvements in surrounding blood flow could meaningfully increase nutrient delivery