The Vitamin Shoppe is a good place to purchase vitamin B12 supplements in a variety of forms, such as softgels, tablets and in liquid form, explains the store's official website. The vitamin is also available for purchase in the supplement sections of pharmacies, such as CVS Pharmacy.
In addition to taking supplements, individuals can consume vitamin B12 through eating certain foods, states the National Institutes of Health Office of Dietary Supplements. Clams and beef liver are among the richest dietary sources of the vitamin, while poultry, eggs, milk and other meats also naturally supply B12. There are also many foods on the market that do not naturally contain B12 but are fortified with the vitamin, such as certain breakfast cereals. Reading the nutrition labels of foods reveals whether a particular product is fortified with vitamin B12 or other nutrients.
In some cases, doctors prescribe vitamin B12 in forms unavailable over the counter, including in injection form and as a nasal gel, notes the National Institutes of Health Office of Dietary Supplements. The shots are typically reserved for the treatment of a vitamin B12 deficiency, which between 1.5 and 15 percent of the population suffers from because some individuals have difficulty absorbing the vitamin from dietary sources. The deficiency can produce a myriad of symptoms, some of which include depression, balance problems, memory issues and fatigue.