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Many people overlook the connection between nutrients and sleep quality, but Vitamin B12 is crucial in helping regulate your sleep-wake cycle

Oral B12 supplements have to pass through the gut, and absorption can be limited especially if you have digestive issues, take certain medications like metformin or antacids, or simply have low stomach acid

For context, GHK-Cu has been formally reviewed by the Cosmetic Ingredient Review (CIR) Expert Panel, the industry body that assesses cosmetic ingredient safety in the US, and found safe as used at typical cosmetic concentrations

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Vitamin B12 deficiency Vitamin B12 is an essential water-soluble nutrient also known as cobalamin