Calcium absorption
Vitamin D promotes calcium absorption in the intestine.
Vitamin D
VitaminVitamin D helps your body handle calcium and phosphorus and supports normal bones, muscles, nerves, and immune function.
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What it is
What Is Vitamin D?
Vitamin D helps your body handle calcium and phosphorus and supports normal bones, muscles, nerves, and immune function.
You do not need to memorize a nutrient chart. The useful part is knowing where it shows up in food, roughly how much you need, and what that can look like on an actual plate.
What the body uses it for
What Vitamin D Actually Does
Bone mineralization
It helps maintain calcium and phosphorus availability for bone mineralization.
Muscle and nerve function
Vitamin D receptors are present in tissues involved in muscle and nerve function.
Immune function
Vitamin D participates in normal immune regulation.
How much you need
How Much Do You Need?
Recommended amounts depend on the nutrient, age, sex, and life stage. Some compounds do not have an established Dietary Reference Intake.
Use the authoritative source below for the current RDA, AI, upper limit, or other guidance that applies to Vitamin D.
See current intake guidance →Food sources
Where Vitamin D Shows Up in Food
You do not need to memorize this list. These are everyday examples of foods that can contribute Vitamin D. Amounts can change with serving size, variety, preparation, and fortification.
Fatty fish
Fortified milk
Egg yolk
UV-exposed mushrooms
Fortified foods
Food composition reference: USDA FoodData Central.
Make it useful
What Does That Look Like on a Plate?
Knowing what is in your food is useful. Knowing what to do with it is better. Pick a food. Find a recipe. See what you already have. Plan the meal. Buy what is missing. Then go eat food.
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A little context matters
When More Isn't Better
Excessive vitamin D from supplements can cause toxicity and abnormal calcium levels. Sun exposure and supplement needs vary by individual circumstances.
Food and supplements are not the same thing. Supplements can deliver much larger doses. Medications, pregnancy, kidney or liver function, allergies, and other health circumstances can change what is appropriate.
Evidence & trusted sources
Where This Information Comes From
NIH Office of Dietary Supplements – Vitamin DPrimary nutrient reference
USDA FoodData CentralFood composition and nutrient data
Evidence last reviewed: October 2026
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