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Serious adverse events from properly formulated topical GHK-Cu are rare in the published literature, but rigorous large-scale human safety trials are lacking
Conditions like pernicious anaemia (an autoimmune disorder where your body cant absorb B12 from food), certain stomach conditions, medications that reduce stomach acid, or even gastrointestinal surgeries (like weight loss surgery) can prevent your body from properly taking in B12, even if youre getting enough in your diet
But when it lingers, it leads to redness, sensitivity, and accelerated aging
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