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An intramuscular B12 shot bypasses gut absorption and typically lasts 2 to 4 weeks

This is particularly important for individuals with specific medical conditions that impair vitamin D absorption or require rapid correction of deficiency

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However, only a few can deliver what they promise

(d) Cognitive function: Preliminary studies indicate GHK-Cu may help protect neurons and promote cognitive function, but more research (specifically in humans) is needed

Hydroxocobalamin, the form of B12 most commonly used in UK clinical practice, may cause a harmless pink or red discolouration of urine