sources of vitamin d vegan
Medically reviewed by Sara Osman,RD,PT

Introduction

Vitamin D is either synthesized in the skin through exposure to ultraviolet B rays in sunlight or ingested as a dietary vitamin D.[3]

The version made in the skin is referred to as vitamin d3 whereas the dietary form can either be D3 or a plant-origin molecule, D2. [5]

The 2 forms available through diet or supplements are Vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol), both forms are well absorbed in the small intestine.

Neither ageing nor obesity alters vitamin-D absorption from the gut [1]. However, older people are at high risk of vitamin D deficiency due to age and people with darker skin are less able to produce vitamin D from sunlight[1].

More than 90% of vitamin D for most people comes from exposure to sunlight [9]

Body Functions

Recommended Daily Intake

how much vitamin-d is recommended daily
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Deficiency Symptoms

Vitamin D Food Sources

foods high in vitamin d vegan
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Excessive Intake/ Toxicity Side Effects

Groups At Risk of Vitamin D Deficiency

Vitamin D Interaction With Other Nutrients

  • Dietary fat The presence of fat in the gut enhances vitamin D absorption, but some vitamin D is absorbed even without dietary fat[1].
  • MagnesiumMagnesium regulates the activity of critical enzymes in vitamin D metabolism and hence magnesium deficiency negatively affects vitamin D status[3,6].
  • CalciumVitamin D increases calcium absorption in the gastrointestinal tract. It is believed that without enough vitamin d in the body, only 10% to 15% of dietary calcium is absorbed compared to 30% to 40% absorption when vitamin D reserves are normal[8].
  • Phosphorous Vitamin D helps phosphorus absorption and retention, thereby helping maintain normal serum levels of these minerals [1,2]

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Medically reviewed by Sara Osman,RD,PT

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