Durvet Maxi-B 1000 Injectable is a supplemental source of B-complex vitamins. For use in cattle, swine and sheep. Each ml of Maxi B contains 1,000 mcg B12, 12.5 mg niacinamide, 1.25 mg B1, 5 mg B6, 5 mg d-panthenol and 2 mg B2. as it does not need to be converted, can quickly dissolve for rapid action, and is the best form to supplement the Vitamin B12 beyond food. Maintaining healthy concentrations of Vitamins B12 in the body has the following effects: Support for the promotion of human metabolism. Support helps to promote energy production. Support for a healthy nervous system. Supporting a healthy brain function. In conclusion, Vitamins B12 is able to provide enough energy for our active lifestyle today to keep us busy and keep up with the full schedule of the day, plus set aside some energy for what we like to do. You need to note that an inadequate diet, changes in the digestive tract with age, and certain drugs are the three major factors that may interfere with Vitamins B12 concentration. You can talk to your doctor or pharmacist based on your true situation to determine the best approach for you.