Our Vitamin B-12 is one of the only B-12's on the market produced with Methylcobalamin, which makes it instantly bio-available for your pet's body. While most animal B12's use Cyanocobalamin (a synthetic B12), methylcobalamin is a naturally occurring form of vitamin B12. We believe in clean ingredient lists with minimal preservatives. This is perfect for older cats or dogs & simple to dose, just put the recommended amount on the food daily. Also our B12 improves energy levels, cognitive function, helps malnourished pets gain weight & improves appetite. Perfect for a diabetic cat / dog. Many pet owners have to take their pets to the Vet periodically for B12 injections.....well this is an answer to their prayers!