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Older adults (there is reduced stomach acid production with age, and acid in the stomach is necessary to absorb vitamin B12)
But honest assessment requires acknowledging the evidence gaps that remain
Levels run high in young tissue and fall by more than half after age 60, which lines up with the slower healing and thinner skin people start to notice as the years stack up
Berer, K
Cellular-level literature on what GHK-Cu does is rich
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