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It just highlights the point that what works for some people, can make things worse for others (and vise- versa)

The AAFP advises that injectable therapy leads to more rapid improvement and should be considered in patients with severe deficiency or severe neurologic symptoms (Langan RC, Goodbred AJ, 2017)

Who Benefits Most from Each Approach B12 Injections Prove Ideal For: Individuals with documented B12 deficiency requiring rapid correction achieve fastest results through injection therapy

Xu T, Lv Z, Chen Q, et al

It is intended exclusively for in vitro testing and laboratory experiments

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