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One 8.4 fl oz Red Bull can contains about 5.1 micrograms of vitamin B12, which covers more than a full day for most adults.

One large egg provides about 0.6 mcg of vitamin B12, around a quarter of an adult daily requirement.

A 3-ounce cooked salmon portion usually provides about 2.4 to 4.3 micrograms of vitamin B12, often enough for an adult’s daily target.

One 100 gram serving of cooked chicken breast contains about 0.34 micrograms of vitamin B12, so it gives a modest share of your daily needs.

A 100 g serving of roasted chicken breast usually provides about 0.3–0.5 micrograms of vitamin B12, while chicken liver can reach about 21 micrograms.

One large egg usually provides around 0.5 micrograms of vitamin B12, which covers about one fifth of an adult’s daily requirement.

Most seniors need about 2.4 micrograms of vitamin B12 each day, often from fortified foods or a small daily supplement.

Most adults with nerve pain use 1,000–2,000 mcg of vitamin B12 daily, but the right dose depends on cause, lab results, and medical guidance.

Most adults with vitamin B12 deficiency need 50–1,000 micrograms daily or regular injections, set and monitored by a healthcare professional.

Most healthy adults do well with about 2.4 to 4 mcg of vitamin B12 per day, with higher needs during pregnancy, breastfeeding, and some health conditions.