vegetarians should get b12 injections Viva! B12 Injections vs Pills: Richmond's
Description
In sum: You can raise your vitamin B12 levels quickly by taking a super dose of vitamin B12 or vitamin B12 injections, before resuming with the normal recommended dose

Promoting Healthy Hair, Skin, and Nails The role of B12 in cell production extends to the cells that make up hair, skin, and nails

Metformin
In fact, high vitamin B12 levels are very rare