Red blood cells
Vitamin B12 is required for normal red-blood-cell formation.
Vitamin B12
VitaminVitamin B12 helps make red blood cells and DNA and helps keep the nervous system working normally.
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What it is
What Is Vitamin B12?
Vitamin B12 helps make red blood cells and DNA and helps keep the nervous system working normally.
You do not need to memorize a nutrient chart. The useful part is knowing where it shows up in food, roughly how much you need, and what that can look like on an actual plate.
What the body uses it for
What Vitamin B12 Actually Does
Nervous system
It is required for normal neurological function.
DNA synthesis
B12-dependent enzymes contribute to DNA synthesis.
One-carbon metabolism
Vitamin B12 works with folate in methionine and homocysteine metabolism.
How much you need
How Much Do You Need?
Recommended amounts depend on the nutrient, age, sex, and life stage. Some compounds do not have an established Dietary Reference Intake.
Use the authoritative source below for the current RDA, AI, upper limit, or other guidance that applies to Vitamin B12.
See current intake guidance →Food sources
Where Vitamin B12 Shows Up in Food
You do not need to memorize this list. These are everyday examples of foods that can contribute Vitamin B12. Amounts can change with serving size, variety, preparation, and fortification.
Fish and shellfish
Meat
Dairy foods
Eggs
Fortified foods
Food composition reference: USDA FoodData Central.
Make it useful
What Does That Look Like on a Plate?
Knowing what is in your food is useful. Knowing what to do with it is better. Pick a food. Find a recipe. See what you already have. Plan the meal. Buy what is missing. Then go eat food.
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A little context matters
When More Isn't Better
Vitamin B12 deficiency can have several causes, including absorption problems. Persistent symptoms or abnormal laboratory results need clinical evaluation rather than food changes alone.
Food and supplements are not the same thing. Supplements can deliver much larger doses. Medications, pregnancy, kidney or liver function, allergies, and other health circumstances can change what is appropriate.
Evidence & trusted sources
Where This Information Comes From
NIH Office of Dietary Supplements – Vitamin B12Primary nutrient reference
USDA FoodData CentralFood composition and nutrient data
Evidence last reviewed: October 2026
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