Vitamin D3: Food Sources & Daily Intake

Vitamin D is the “sunshine vitamin” — your skin makes it from sunlight, so food is only part of the picture. In the diet it is overwhelmingly an animal and fortified nutrient: fatty fish, cod liver oil, egg yolk and beef liver carry the most natural D3 (cholecalciferol), while UV-exposed mushrooms are the one meaningful plant source (they make D2, ergocalciferol). Because so few foods are naturally rich in it, many staples — milk, plant milks and some orange juice — are deliberately fortified.

Table of Contents

1. How to Read These Tables
2. Recommended Intakes & Upper Limits
3. Bioavailability & Absorption
4. Cooking & Storage
5. Vegetarian & Vegan Sources
6. Who Needs to Pay Attention
7. Data Sources & References
8. Connections
9. Featured Videos

How to Read These Tables

• Fat-soluble — it is stored. Unlike vitamin C, vitamin D is fat-soluble and builds up in body fat and the liver, so a steady weekly average matters more than hitting the number every single day. That same storage is why the upper limit is worth respecting.
• %DV vs RDA. The %DV column compares a serving against the FDA Daily Value of 20 mcg (800 IU). Your personal target (the RDA) is 15 mcg for most people and 20 mcg after age 70 — see the second table. Remember 1 mcg = 40 IU when reading supplement labels.
• Per 100 g vs per serving. Per-100 g lets you compare foods fairly; the serving size shown beside each food is what you actually eat. Cod liver oil and a piece of trout or salmon dominate, while most other foods only reach a useful amount once they are fortified.

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Recommended Intakes & Upper Limits

Your personal target depends on age, sex and pregnancy. The Daily Value used for the %DV column above is a single label figure; the table below is the age-specific guidance.

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Bioavailability & Absorption

Because vitamin D is fat-soluble, it is absorbed best when eaten with some fat — conveniently, its richest sources (oily fish, cod liver oil, egg yolk) already come packaged with fat. D3 from animal foods and D2 from mushrooms are both usable, but most research finds D3 raises and maintains blood levels somewhat more effectively, which is why D3 is the more common supplement. Whatever the source, the vitamin still has to be activated by the liver and kidneys before the body can use it, and adequate magnesium is needed for those steps to run smoothly.

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Cooking & Storage

Vitamin D is far more rugged than vitamin C — it tolerates normal cooking heat reasonably well, so baking, grilling or pan-cooking fish keeps most of it. Some is lost with prolonged high-heat frying and a little can leach into cooking fat, but ordinary preparation is fine. The bigger lever for mushrooms is light, not heat: exposing sliced mushrooms gill-side-up to sunlight or a UV lamp before cooking can multiply their vitamin D many times over, and that gain survives cooking.

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Vegetarian & Vegan Sources

This is the hardest vitamin to get from a plant-based diet, because natural plant foods contain almost none — every top source is fish, egg or liver. Plant-based eaters have three practical routes: UV-exposed mushrooms (the one real whole-food source, supplying D2), fortified foods (plant milks such as almond or oat, and orange juice with vitamin D added — always check the label), and a supplement, ideally vegan D3 from lichen or D2. Relying on sunlight alone is unreliable for many people, so most plant-based eaters should plan a fortified food or supplement rather than count on diet.

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Who Needs to Pay Attention

Groups who should pay attention: older adults (skin makes less D and needs rise to 20 mcg after 70), people with little sun exposure or darker skin, those who cover up or live at high latitudes, breastfed infants (human milk is low in D — pediatricians advise a supplement), and anyone with fat-malabsorption (celiac, Crohn’s, bariatric surgery). Long-term shortfall causes rickets in children and soft, aching bones (osteomalacia) plus worse osteoporosis in adults. Toxicity is real but comes almost entirely from over-supplementing, not food or sun: very high intakes push blood calcium up and can damage the kidneys, which is why the 100 mcg adult upper limit matters.

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Data Sources & References

• NIH Office of Dietary Supplements — Vitamin D Fact Sheet (DV, RDA, UL, IU conversion)
• Linus Pauling Institute — Vitamin D Micronutrient Information Center
• PubMed — vitamin D food sources, D2 vs D3 and bioavailability

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Connections

• Vitamin D3 (Main Page)
• Vitamin D3 Benefits
• Vitamin D3 History
• All Vitamins
• Calcium (D controls its absorption)
• Vitamin K
• Magnesium
• Salmon

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Featured Videos