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Topical formulations require penetration enhancers or vehicle optimization, and in vivo data suggest lower bioavailability compared to subcutaneous administration
Several principles are worth emphasizing regardless of the specific numbers
Alternative vitamin B12 supplementation is also a healthy, safe way to boost energy levels between vitamin B12 injections, when your doctor doesnt prescribe enough vitamin B12 to alleviate symptoms of chronic fatigue, brain fog, painful numbness and tingling, and memory problems
PMC 3062981
LEMON212
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