Can you get enough vitamin D on a vegan diet?

The objection

“Vitamin D comes from fish, eggs and fortified dairy. Cut those out and you’re heading for deficiency.”

The answer

The question is mis-framed from the start, and reframing it matters more than any food list.

Vitamin D is barely a dietary nutrient at all. The body makes the bulk of it when skin is exposed to summer sunlight. Oily fish and egg yolk carry some, but ordinary intakes from food are small, which is why deficiency is widespread across the whole population at high latitudes, meat-eaters very much included. In the UK, the NHS advises everyone to consider a vitamin D supplement over autumn and winter, when sunlight is too weak for the skin to make any. That advice is aimed at the entire population, not at vegans.

So the question to ask is whether a vegan can supplement, and the answer is plainly yes. Vitamin D2 is vegan, and lichen-derived vitamin D3 is now widely sold, biochemically identical to the D3 your skin makes and to the lanolin-derived D3 in standard supplements.

One genuine nuance is worth stating: meta-analysis shows D3 raises and maintains blood levels somewhat more effectively than D2 at equal doses. A vegan optimising their status should therefore lean towards lichen D3 over D2. Both are vegan options, so this is a tweak rather than a gap in the diet.

To sum up: vitamin D status comes down to sunlight, latitude and supplementation, and has little to do with whether you eat animals. The mainstream advice for a northern population is to supplement regardless, and vegan-suitable supplements do the job.