Most adults use 250–500 mcg of vitamin B12 daily for weight loss goals, but it mainly corrects low levels rather than driving fat loss on its own.

For daily energy, most adults need about 2.4 mcg of vitamin B12, while higher short-term doses are usually reserved for medically supervised plans.

Most vegan adults need about 2.4 micrograms of vitamin B12 per day, usually met through fortified foods and a small supplement.

Most 2-oz 5-hour Energy shots contain 500 mcg of vitamin B12, roughly 20,000% of the daily value for a healthy adult.

Most healthy adults need about 2.4 micrograms of vitamin B12 per day, with slightly higher daily needs in pregnancy and breastfeeding.

Vitamin B12 injection doses usually range from 100 to 1,000 micrograms, set on a schedule your doctor chooses for your needs.

Most fortified nutritional yeast supplies around 4–24 micrograms of vitamin B12 per 2-tablespoon serving, depending on the brand.

Most adults start with 1,000 micrograms of vitamin B12 by injection once a week for 4–6 weeks, adjusted by a doctor for your cause of deficiency.

One cup of plain yogurt usually provides about 1–1.4 micrograms of vitamin B12, close to half of an adult daily target.

One large egg supplies about 0.6 micrograms of vitamin B12, roughly one quarter of an adult’s daily needs.