Vitamin B12
Vitamin B12 supports nerve function, red blood cell formation, and DNA production. This guide explains common food sources, why intake and absorption are different, and how to review your recorded diet.
Recommended intake varies by age, sex, and life stage. Tracking what you actually eat can help you understand your overall dietary intake over time.
What Vitamin B12 does
Vitamin B12 plays a role in:
- supporting normal nerve function
- contributing to red blood cell formation
- supporting DNA production
- playing a role in normal cell function and growth
Vitamin B12 intake
Intake targets vary across life stages. Age, sex, eating patterns, food variety, and day-to-day routines can all influence how much vitamin B12 appears in a person’s diet.
Tracking can help you compare your usual food pattern with the foods that commonly provide vitamin B12.
Common food sources of Vitamin B12
Food sources of Vitamin B12 may include:
- fish and seafood
- meat and poultry
- eggs
- milk, yogurt, and cheese
- fortified breakfast cereals or fortified nutritional yeast
The amount can vary depending on the food, serving size, preparation method, and brand.
What can affect Vitamin B12 intake
A person’s intake may vary due to factors such as:
- food preferences such as very limited animal foods
- restricted diets or low use of fortified foods
- appetite changes or small meal sizes
- digestive tolerance and limited food variety
- lifestyle habits and meal routines
B12 foods and absorption: two different questions
Fish, meat, eggs, and dairy provide vitamin B12. Some cereals and nutritional yeasts have added B12, but fortification varies by product. Check the label rather than assuming every plant-based alternative contains it.
A food diary estimates intake; it cannot show how much B12 your body absorbs or diagnose deficiency. Digestive conditions and some medicines can affect absorption even when recorded intake looks adequate. Discuss concerns with a clinician.
How to track vitamin b12 in your food diary
- Record the actual product and portion, especially for fortified cereal or nutritional yeast.
- Review several days to see whether B12 sources appear regularly.
- Check whether the food record has a B12 value. Missing data is not proof that a food contains none.
- Keep a summary of your food pattern for discussion alongside any clinical assessment.
For digestive context, see our coeliac disease tracking page. Food logs provide context, not a measure of absorption.
How NutriSignals helps
NutriSignals helps you review vitamin B12 intake from the foods you record. It is designed to help you better understand your diet, identify possible nutrient gaps, and generate clear nutrition reports you can share with your healthcare professional.
When to speak with a healthcare professional
If you have symptoms, ongoing health concerns, a diagnosed condition, or questions about your diet, seek advice from your doctor, specialist, or dietitian. They can assess your individual situation.
Sources and further reading
Updated 4 October 2026. These educational sources explain the nutrient background; they do not endorse NutriSignals. Intake targets vary by country and life stage.
Want a clearer picture of your nutrient intake?
NutriSignals helps you track your diet, review nutrient gaps, and create reports you can take to your healthcare professional.