Vitamin B-12 is vital for normal red blood cells, metabolizing food into energy and keeping your nerves working properly. While it's best to get it from the foods you eat, some people can't manage to fill their daily requirement that way. That's when liquid vitamin B-12 offers a convenient, easy-to-swallow way to boost your intake. Contains 2 fluid oz (60 ml), which is a full 60-day supply. Shake well before use, fill the dropper (1 ml total serving) and hold it for 15-20 seconds before swallowing.