b12 tablets vs injections Optimal Vitamin Dosage and Treating Deficiency Vitamin B-12 Injections Vs Oral

Structure-Activity Relationship for Small Molecule Inhibitors of Nicotinamide N-Methyltransferase

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The answer to this question may not be as straightforward as it seems

Decreased stomach acid production also provides an environment conducive to the overgrowth of anaerobic bacteria in the stomach, which further interferes with vitamin B 12 absorption (3)

Li W et al., J Pain Res 2020 Methylcobalamin for post-herpetic neuralgia meta-analysis

If you have a B12 deficiency, or are elderly, high risk, or suffer from chronic fatigue, you may benefit from this injection