b12 injection other name Sandoz Vitamin Injectable Solution - 1000 mcg/10 mL or for certain illness or disease like anemia Vitamin B12 Injection – Manufacturer
Description
The treatment combines the use of dermal fillers with muscle relaxers in order to achieve the appearance of a facelift without resorting to surgery

Kraus D, Yang Q, Kong D, Banks AS, Zhang L, Rodgers JT, Pirinen E, Pulinilkunnil TC, Gong F, Wang YC, Cen Y, Sauve AA, Asara JM, Peroni OD, Monia BP, Bhanot S, Alhonen L, Puigserver P, Kahn BB. Nicotinamide N-methyltransferase knockdown protects against diet-induced obesity. Nature. 2014 Apr 10;508(7495):258-62. doi: 10.1038/nature13198. PMID: 24717514; PMCID: PMC4107212

Yes, B12 can expire
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Patients often take B12 shots to improve their mood and energy levels, since B12 supports the production of serotonin and dopamine and encourages the conversion of food to energy

Sometimes the smell of food will turn your cat off, but if you put a tiny bit on their lip to lick off, their appetite gets stimulated and they'll eat

The volume of the injection, in milliliters (mL) , can change based on the solutions concentration