Vitamin D and B12 aren't linked in the sense that one causes the other but is relatively common for someone to fall short on both of these vitamins. For example, people who don't eat any animal products (vegans) typically need supplemental vitamin D and B12 either from fortified foods or supplements. Both of these vitamins are found primarily found in animal foods, although plant-based products can be fortified with D such as soy milk. Sunlight is another source of vitamin D.
Another example would be someone who had gastric bypass surgery -- they are at higher risk for vitamin D and B12 deficiencies. People with excess weight tend to have lower levels of vitamin D and additional B12 is needed after this type of surgery because absorption occurs in the stomach.
A third example is someone who is elderly. They absorb less vitamin B12 from food and do not make as much vitamin D from the sun. Work with your healthcare provider or a registered dietitian to make sure you are getting enough of both of these vitamins.
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