do b12 injections have any side effects How Fast Does Injection Work How soon you feel less tired after a B12 shot? Common & Rare Side Effects

This correction is important because of the relatively small volumes of distribution of these water-soluble drugs

For individuals experiencing mild gastrointestinal upset from B12 supplements (uncommon but possible with high doses), taking the supplement with breakfast may improve tolerance

Other Digestive enzyme supplements: If your dogs B12 deficiency is due to a digestive issue like EPI (see above section, What can cause B12 deficiency in dogs?), then adding a digestive enzyme supplement can help them break down food better and may improve the absorption of B12 and other nutrients

For those following a vegetarian or vegan diet, or who are pregnant or nursing, an organized diet that includes food and drinks fortified with B12 is essential