The Feline Essentials B12 has definitely improved my cat's appetite and appearance in recovering from Pancreatitis. I started using the B12 last week in combination with the CATalyst product that I've been Delighted I received my B12. I don't see a use by date on them or am I missing it? Lilly Says Compounded Tirzepatide With Added Vitamin B12 Contains Impurities. Is It Safe? Calcium Gluconate and Vitamin D3 & B12 Injection Best Price for Animal Health Compounded Vitamin B Complex Injection Empower Pharmacy