About this item Our Methylcobalamin liquid Vitamin B-12 May Help With -Nervous System/Mood/Energy, GI Tract/Immune system, May Stimulate Appetite in both Cats and Dogs, Is a Bioactive Form of B12 that doesn't need to be converted metabolically Vitamin B12 is an essential vitamin that plays an important role in within the body of dogs and cats including the function of the brain and nervous system, cell growth, protein synthesis, metabolism of fat and carbohydrates, and the formation of red blood cells. Vitamin B12, which is also called cobalamin, is not made by the body and must be supplied by food or nutritional supplements. Having a lack of B12 can lead to other health problems, and both dogs and cats can develop a deficiency to this vitamin. In certain breeds of dogs, B12 deficiency can be genetically passed on especially in beagles, border collies, and giant schnauzers. It can also occur in those dogs and cats with exocrine pancreatic insufficiency (EPI) or senior dogs or cats.. We are a Oklahoma based, veterinarian owned, family business appreciate the opportunity to help your pet! Made in the USA 100% Satisfaction Guarantee! Your Vet will be amazed with the changes in B12 levels without injections!