b12 injection is cyanocobalamin Vitamin Injectable Solution for Horses, 5000-mcg, 100-mL - Easy Refills blood formation CYANOCOBALAMIN INJECTION, USP

There are very little plant sources that contain Vitamin B12 apart from small amounts in some yeast products

As shown in Figure 2D,E, significantly increased number of apoptotic cells was found in the TBI group relative to the sham group

At Liaquat University of Medical & Health Sciences (LUMHS), Jamshoro (Sindh Province), efficacy of Sucrosomial B12 was compared with conventional formulated Evermin B12 (Methylcobalamin 1,000 g, manufactured by Global Laboratories and marketed by Reliance Pharma, Islamabad, Pakistan) & Neuromax B12 (Mecobalamin 1,000 g, manufactured by Bio Fine Pharmaceuticals, Multan, Pakistan)

When plants get eaten by the cow, they get broken down by the rumen microbes, which then take the nutrients for themselves and fermentation byproducts for the cow to use

So clearly there is something else going on