b12 deficiency injections or tablets vs Pills: Richmond's Complete Guide Vitamin B12 Injections vs. Supplements:
Description
Other physical reactions Headaches Dizziness for a few hours Feeling jittery or nervous briefly Mild fever These effects usually disappear within 12 days

Some participants achieved weight loss of approximately 24% of body weight at 48 weeks approaching levels reported with some bariatric surgical procedures, though no direct head-to-head comparisons have been conducted and long-term durability beyond the trial period remains unknown

(6) Kannt A, et al
The same source also indicates that injectable B12 reliably restores levels when oral absorption is impaired

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So, which one should you choose, B12 oral supplements vs
