Hello, my cat got recommended 0.5 ml of B12 every week. He got 5 shots already. At the moment he's eating less and less. Is the amount ok in your experience? I Hello, my cat got recommended 0.5 ml of B12 every week. He got 5 shots already. At the moment he's eating less and less. Is the amount ok in your experience? I Glam Derma VITAMIN B12 (Generic) Injectable Solution, 1000 mcg mL, 100 mL vial Easy Refills Chewy Rx Hello, my cat got recommended 0.5 ml of B12 every week. He got 5 shots already. At the moment he's eating less and less. Is the amount ok in your experience? I Vitamin B12 Injection at BiosenseClinic.com a Licensed Pharmacy