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Dosing here comes from preclinical animal research (Neelakantan et al., 2018 onward) and community-reported protocols
Vitamin B12 injection dosage and Vitamin B12 injection frequency vary by diagnosis, baseline levels, symptoms, and response
What You Can Expect After a B12 Shot Most people notice a difference within a few days sometimes even within hours
And in many situations, the answer leans towards the injections being more potent in their delivery
2010 Sep;95(9):4291-304
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