cat b12 injection side effects Transdermal for Cats: How to Give a a B12 Shot in Hind Leg Area Vitamin B12 Deficiency in Cats:

Medical History Impact Your medical history also affects how often you need B12 shots

[51] Diagnosis [edit] According to one review: "At present, no 'gold standard' test exists for the diagnosis of vitamin B 12 deficiency and as a consequence the diagnosis requires consideration of both the clinical state of the patient and the results of investigations." [52] The vitamin deficiency is typically suspected when a routine complete blood count shows anemia with an elevated mean corpuscular volume (MCV)

Vitamin B12 deficiency is pretty common, and many people take B12 injections

According to the manufacturer, this form is more easily absorbed when taken orally compared to cyanocobalamin