Purity and dosing can vary considerably in commercial preparations
While there are other forms of this substance, I do not find them to be practical (intravenous), equally as effective (creams) or easily tolerated (nebulized and inhaled, or rectal suppositories)
doi: 10.3390/microorganisms8030406
The team at ThinWorks can help you decide whether oral, sublingual, or injectable B12 makes the most sense given your digestion and lab results. Why Vitamin B12 Is So Important Low levels of vitamin B12 can have an impact on everything from energy to brain health because it is essential for the production of red blood cells, nerve function, and DNA synthesis
If your formulation includes a lipid carrier, this happens fast because the carrier itself is restoring the lipid barrier
demonstrating that an annular needle puncture and disc injection, e.g., discography, results in an accelerated disc degeneration in normal as well as moderately degenerated discs compared to a matched control