Durvet High Level Vitamin B Complex Livestock Supplement, 250 mL at Tractor Supply Co B12 vitamin Store Vitamin B12 injectable B Complex 30 ampules Vitamin B and thiamine over the counter options Compounded Cyanocobalamin (Vitamin B12) Injection Empower Vitamin B 12 Injection, 5,000 mcg mL, 100 mL at Tractor Supply Co Cyanocobalamin Vitamin B12 Supplement, 5,000 mcg mL, 100 mL at Tractor Supply Co