Dairy is one source, not the only source
Calcium is needed for bones, teeth and other normal body functions. A vegan diet excludes dairy foods, but calcium can also come from fortified plant drinks, calcium-set tofu and vegetables such as kale, broccoli and bok choy. A supplement is not automatically required simply because someone avoids dairy. [1]
The practical question is whether the foods actually eaten provide enough calcium for the person’s age and circumstances. A varied diet still needs deliberate sources of nutrients that might otherwise have come from dairy. [1]
Fortification and absorption both matter
Plant drinks differ in fortification, so the calcium content of one product should not be assumed for another. Check the amount per serving and the serving actually consumed. Tofu also varies with how it is prepared; the word tofu alone does not establish its calcium content. [1]
A food’s calcium content is not identical to the amount absorbed. ODS describes low absorption from spinach because oxalate binds calcium, while calcium from some lower-oxalate vegetables is better absorbed. A large spinach serving should not be treated as nutritionally interchangeable with every other calcium source. [1]
Review a real menu
Imagine someone replaces dairy milk with an unfortified plant drink while keeping the rest of their menu unchanged. They have made a dietary substitution, but have not established that the calcium contribution stayed the same. Checking that drink and the rest of the day is more useful than buying a supplement on the basis of being vegan.
A dietitian can help identify food substitutions or an actual shortfall. This example does not calculate a personal requirement or assume the whole diet is inadequate.
| Observation | Interpretation |
|---|---|
| Fortified versus unfortified drink | Read the actual label |
| Serving consumed | Use the portion in the menu |
| Other calcium foods | Assess the day, not one ingredient |
Fill a demonstrated gap
ODS advises meeting nutritional needs primarily through foods, including fortified foods, while recognizing that supplements can be useful when food alone is insufficient. Include supplements and calcium-containing antacids in any total-intake review. [1]
Kidney disease, a stone history or interacting medicines can change the advice. These considerations belong in a supplement decision even when the reason for reviewing calcium began with a food preference. [1]
Sources for this article
- NIH ODS — Calcium: Health Professional Fact Sheet
Source consulted: 2026-09-17. This is a reference resource, not a claim that we conducted the studies or tested a product.