what are side effects of b12 injections Shots — Why They So Popular? B12 injection side effects :

Vitamin B12 is best injected intramuscularly into the deltoid (upper arm), thigh, or gluteal muscle (buttocks)

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Instead, go as shallow as necessary, often just under the skin in order to deliver the methyl-B12 into subcutaneous tissue

After a B12 injection, avoid strenuous activity for 24 hours, refrain from soaking in hot baths or jacuzzis for at least 24 hours, and do not rub the injection site

"Maintain cleanliness and avoid administration during wet or dusty conditions." Sheep and cattle can also be exposed to sub-clinical mineral deficiencies if they cannot meet their nutritional requirements from consumed feed during critical stages of the production cycle, such as before joining, lambing/calving or weaning