how to give a cat a b12 injection How-To: Giving Subcutaneous (SQ) Vitamin
Description
Got my 2nd one February 10th in my left arm and woke up the following day with a lump under my arm the size of a baseball cut in half

at the site of a retained surgical sponge in the abdomen of one cat (Haddad et al., 2010)

Enhances metabolic efficiency and fat utilization

I cant help but think it is related to my vaccine