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Weeks one through four typically show minimal visible change

A landmark 2009 study found that GHK-Cu reversed the gene expression of older skin cells to look more like young skin cells, upregulating collagen and downregulating inflammatory genes

Although high doses of B12 are generally considered safe due to its water-soluble nature, most individuals can obtain sufficient B12 through a balanced diet that includes foods like meat, eggs, and fortified cereals

The most commonly reported side effects include mild nausea, constipation, and some gastrointestinal discomfort

For example, a small pilot study might suggest benefits, but without larger, randomized controlled trials, these results are not reliable