vitamin b12 injection serum available in us B-12 Injectable Solution dogs and horses as needed Compounded Cyanocobalamin (Vitamin B12) Injection
Description
As a result, theres not enough IF to absorb B12

Typically, it's a problem that's found in older and middle or middle-aged cats

Pregnancy and Breastfeeding Suitable for pregnant & breastfeeding women
Easy measuring: At 4,000 mcg/mL, 1 unit = 40 mcg on a U-100 syringe (units = mcg 40)