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For people with confirmed vitamin deficiency, injectable B12 is a clinically well-established and effective treatment

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Convenience, Frequency, And Cost Injections Require syringes, safe disposal, and usually medical supervision Often weekly or monthly, depending on protocol Costs can add up with repeated clinic visits Nasal spray Takes a few seconds, wherever you are Easy to build into a daily routine No sharps, no office visit, and generally lower ongoing cost For many busy professionals, athletes, and biohackers, nasal sprays offer most of the benefits of injections with a lower barrier to consistent use

GLP-1 agonists can cause some muscle loss if protein intake is insufficient ensure you're hitting 180200g protein/day

I have lost 6 pounds in almost 3 weeks