what's a b12 injection for How injections can boost energy and health | Mind Matters Weight Loss Clinic posted on the topic Sublingual B12 vs. B12 Injections:
Description
This can lead to B12 deficiency, which can cause symptoms such as fatigue, weakness, and difficulty concentrating

Below is a comparison using available clinical evidence

0.9% benzyl acid, excipient qs 30 ml

Mechanistically, NNMT suppression increased adipose SAM and NAD, upregulated polyamine flux enzymes (ODC, SSAT), and altered histone methylation consistent with a shift toward oxidative metabolism [2]
