Vitamin D for Vegans & Vegetarians
Vitamin D is a fat-soluble prohormone critical for calcium absorption, bone density, immune modulation, and muscle function. The body synthesises it from sunlight exposure, but dietary intake becomes important when sun exposure is limited — a common situation in Northern Europe. For vegans and vegetarians, dietary sources create an additional challenge because the most concentrated food sources are animal-derived.
Why Plant-Based Diets May Fall Short
The primary dietary sources of vitamin D are fatty fish, fish liver oil, egg yolks, and fortified dairy products. Most whole plant foods contain negligible amounts. Mushrooms exposed to UV light produce vitamin D2 (ergocalciferol), but the amounts vary widely depending on exposure conditions and storage.
A cross-sectional analysis found that vegans had significantly lower serum 25-hydroxyvitamin D concentrations compared to omnivores, and were more likely to be deficient during winter months (Crowe et al., 2011). In a Nordic country like Estonia, where UVB radiation is insufficient for cutaneous synthesis for six or more months per year, dietary supplementation becomes essential rather than optional.
Vegan-Friendly Sources of Vitamin D
The two main forms of supplemental vitamin D are:
Vitamin D2 (ergocalciferol) — derived from yeast or fungal sources. Always vegan. Traditionally considered less potent than D3, though the evidence for this difference is contested in recent literature.
Vitamin D3 (cholecalciferol) — traditionally derived from lanolin (sheep wool fat), making it non-vegan. However, vegan D3 is now commercially available, derived from lichen (Cladina spp.). This form is bioidentical to the D3 produced by human skin and is increasingly available in supplement products.
For vegans who want the superior bioavailability of D3, lichen-derived vegan D3 supplements are the best choice.
Dose Targets
For adults living in Northern Europe, a daily maintenance dose in the range of 1000–2000 IU (25–50 micrograms) is commonly recommended during autumn and winter. A meta-analysis of supplementation trials found that daily doses of at least 800 IU raised serum 25(OH)D to levels associated with reduced fracture risk and improved muscle function in adults (Bischoff-Ferrari et al., 2012). Regular blood testing every 6–12 months is the most reliable way to confirm you are reaching and maintaining adequate status.
What to Combine
Vitamin D + vitamin K2: Vitamin D promotes calcium absorption; vitamin K2 (specifically MK-7) helps direct that calcium into bones rather than soft tissues. This is why many D3 supplements are now formulated with K2. For vegans, ensure the K2 source is plant-derived (menaquinone from natto is vegan).
Vitamin D + magnesium: Magnesium is a cofactor in vitamin D metabolism. Low magnesium status can impair the conversion of vitamin D to its active form. If you supplement D3, ensuring adequate magnesium intake is sensible.
Vitamin D + dietary fat: Vitamin D is fat-soluble. Taking your supplement with a meal containing fat meaningfully improves absorption.
Choosing a Vegan Supplement
When selecting a D3 product, check the source. Products derived from lanolin are not vegan; lichen-derived options are. Many softgel capsules use gelatin, which is also not vegan — look for products explicitly labelled vegan or in vegetable capsules.
OstroVit Vitamin D3 4000 IU 120caps and OstroVit Vitamin D3 + K2 90 tabs are widely used options at maxfit.ee. For a combined D3+K2 product, NOW Vitamin D-3 & K-2 120caps is another well-regarded choice. The NOW Liquid Vitamin D-3 59ml offers a flexible dosing format suitable for those who prefer liquids. Always check the product label for vegan certification if this is a priority.
FAQ
Can vegans get enough vitamin D from food alone?
In practice, very few vegans get sufficient vitamin D from food alone, particularly in Northern Europe. UV-exposed mushrooms provide some D2, but amounts are variable and generally not sufficient to maintain adequate serum levels year-round. Supplementation is recommended.
Is vitamin D2 as effective as D3 for vegans?
D3 is generally considered to raise and maintain serum 25(OH)D more effectively than D2 at equivalent doses, though both are beneficial. Vegan D3 derived from lichen is now widely available and is the preferred choice for vegans who want the D3 form.
Does vitamin D need to be taken with food?
Yes. Vitamin D is fat-soluble and absorption is significantly better when taken with a fat-containing meal compared to on an empty stomach.
References
Crowe, F. L., Steur, M., Allen, N. E., Appleby, P. N., Travis, R. C., & Key, T. J. (2011). Plasma concentrations of 25-hydroxyvitamin D in meat eaters, fish eaters, vegetarians and vegans: results from the EPIC-Oxford study. Public Health Nutrition, 14(2), 340-346. https://pubmed.ncbi.nlm.nih.gov/20854716/
Bischoff-Ferrari, H. A., Willett, W. C., Orav, E. J., Lips, P., Meunier, P. J., Lyons, R. A., Flicker, L., Wark, J., Jackson, R. D., Cauley, J. A., Meyer, H. E., Pfeifer, M., Sanders, K. M., Stahelin, H. B., Theiler, R., & Dawson-Hughes, B. (2012). A pooled analysis of vitamin D dose requirements for fracture prevention. New England Journal of Medicine, 367(1), 40-49. https://pubmed.ncbi.nlm.nih.gov/22762317/
Tripkovic, L., Lambert, H., Hart, K., Smith, C. P., Bucca, G., Penson, S., Chope, G., Hypponen, E., Berry, J., Vieth, R., & Lanham-New, S. (2012). Comparison of vitamin D2 and vitamin D3 supplementation in raising serum 25-hydroxyvitamin D status: a systematic review and meta-analysis. American Journal of Clinical Nutrition, 95(6), 1357-1364. https://pubmed.ncbi.nlm.nih.gov/22552031/
