The most important fixed task in a vegan diet is reliable vitamin B12 supplementation. The German Nutrition Society recommends ongoing, regular intake and medical monitoring of nutritional status. Other preparations depend on actual need, not solely on avoiding animal foods. [1]
Plan B12 from the beginning
Choose an appropriate preparation and an understandable intake schedule rather than relying on incidental traces in fermented foods. The DGE considers adequate provision in a vegan diet assured only with a nutrient preparation. [1] Treatment of an existing deficiency may have different requirements from regular provision for a healthy person.
As an organizational aid, record the product name, amount contained, agreed schedule and next monitoring appointment together. When changing products, check those details again. Retaining the same tablet count says little without knowing the amount per tablet.
| Vitamin | What matters | What is insufficient |
|---|---|---|
| Vitamin B12 | Reliable supplementation and status monitoring | Occasional, unquantified traces |
| Vitamin D | Endogenous production, circumstances and possible supplementation needs | Assuming every vegan person needs the same amount |
| Riboflavin, vitamin B2 | Targeted food choices and fortification where appropriate | A vegan label without nutrient information |
| Other vitamins | The overall diet and individual situation | Randomly combining several high-dose products |
Vitamin D is not only a vegan question
Provision occurs predominantly through the body's own production under suitable sunlight exposure. Diet, season and personal circumstances influence assessment. The DGE gives 20 micrograms daily as an estimated adequate intake for adults without endogenous production; this is not a blanket additional dose for everyone. [2]
This does not imply a strategy of getting sunburned. For a supplement, the amount actually used and other vitamin D sources from preparations matter. Someone already following a medical plan should not replace it with a general online recommendation.
Read fortified-food labels specifically
The DGE includes riboflavin among potentially critical nutrients and recommends targeted selection of nutrient-dense and, where appropriate, fortified foods. [1] When changing plant drinks, therefore check which added nutrients are actually present. Similar flavor does not mean identical fortification.
A hypothetical calculation: if a label lists 0.2 milligrams of a vitamin per 100 milliliters, 200 milliliters supply 0.4 milligrams by calculation. These figures belong to no particular product and establish no personal requirement. They only show how to calculate a serving.
Look beyond vitamins
Iodine, calcium, iron and protein are not vitamins, but also belong in comprehensive planning. A product labeled multivitamin does not automatically answer those questions. The DGE particularly recommends qualified support for children, pregnancy, breastfeeding and older people. [1]
Bring the foods and supplements actually purchased to a consultation. This is more informative than a list of what could theoretically be eaten. With persistent exhaustion or new neurological symptoms, do not only change supplement choices; have the cause medically assessed.
Frequently asked questions
Is B12 needed only once symptoms appear?
No. Reliable provision should be planned from the beginning.
Do all vegans need the same vitamin D dose?
No. Endogenous production, nutritional status and personal circumstances need consideration.
Are all plant drinks fortified identically?
No. The particular product's information is decisive.
Does a multivitamin resolve every dietary question?
No. Meals, minerals, protein and individual requirements remain important.
Further reading
Choose B12 preparations appropriately and consider other nutrients in a vegan diet.
Sources
- German Nutrition Society: Vegan nutrition FAQ
- German Nutrition Society: Vitamin D reference values and endogenous production
Editorially updated: September 28, 2026. General planning aid with a hypothetical calculation, not individual deficiency treatment.
