Vitamin D
Last updated: August 9, 2026
Benefits
Helps your body absorb calcium for strong bones, and supports muscle and immune function. Your skin also makes it from sunlight.
How much you need
Recommended daily amounts by life stage, per NIH and NASEM Dietary Reference Intakes. Where the evidence hasn't been enough to set a full RDA (Recommended Dietary Allowance), NASEM sets an AI (Adequate Intake) instead — both are shown together below.
| Life stage | RDA / AI |
|---|---|
| Children 1–3 | 600 IU |
| Children 4–8 | 600 IU |
| Boys 9–13 | 600 IU |
| Girls 9–13 | 600 IU |
| Males 14–18 | 600 IU |
| Females 14–18 | 600 IU |
| Men 19–50 | 600 IU |
| Women 19–50 | 600 IU |
| Men 51–70 | 600 IU |
| Women 51–70 | 600 IU |
| Men 71+ | 800 IU |
| Women 71+ | 800 IU |
| Pregnancy 14–18 | 600 IU |
| Pregnancy 19–50 | 600 IU |
| Lactation 14–18 | 600 IU |
| Lactation 19–50 | 600 IU |
Upper limit
This limit applies to total Vitamin D intake — food and supplements combined.
| Life stage | Tolerable upper limit |
|---|---|
| Children 1–3 | 2500 IU |
| Children 4–8 | 3000 IU |
| Boys 9–13 | 4000 IU |
| Girls 9–13 | 4000 IU |
| Males 14–18 | 4000 IU |
| Females 14–18 | 4000 IU |
| Men 19–50 | 4000 IU |
| Women 19–50 | 4000 IU |
| Men 51–70 | 4000 IU |
| Women 51–70 | 4000 IU |
| Men 71+ | 4000 IU |
| Women 71+ | 4000 IU |
| Pregnancy 14–18 | 4000 IU |
| Pregnancy 19–50 | 4000 IU |
| Lactation 14–18 | 4000 IU |
| Lactation 19–50 | 4000 IU |
Sustained excess vitamin D can raise blood calcium, leading to nausea, weakness, confusion, and kidney problems.
Best food sources
| Serving | ||
|---|---|---|
| Salmon and trout | — | — |
| Sardines | — | — |
| Egg yolks | — | — |
| Fortified milk and plant milks | — | — |
| Sunlight exposure | — | — |
Absorption & caution
Absorption: Fat-soluble — absorbs best alongside a meal that contains some fat, and unlike water-soluble vitamins, extra amounts are stored in the body rather than excreted.
Pairings
Works well with
- Calcium — Vitamin D's best-known role is helping the body absorb calcium.
- Vitamin K2 (Menaquinone) — Vitamin K2 complements vitamin D by helping the calcium it absorbs reach bone.
- Magnesium — Magnesium is required by the enzymes that convert vitamin D into its active form.
Body systems & goals
Body systems it supports
- Lungs — The tissue lining your airways renews itself constantly. When you're run down or recovering, these nutrients support that quiet upkeep. (emerging evidence)
- Joints — Your joints let you move freely, cushioned by cartilage and connective tissue that rely on these nutrients. Supporting them helps your body maintain comfortable, easy movement. (established evidence)
- Bones — Bone is living tissue that's always being renewed, drawing on these nutrients to stay dense and strong. Supporting them now helps your body maintain a sturdy frame for years to come. (established evidence)
- Reproductive — Hormone balance and steady energy underpin a healthy reproductive system. These nutrients support your body's normal function in this area, especially when life has left you depleted. (emerging evidence)
- Immune System — Your immune system is on quiet watch every day, and these nutrients supply the raw materials its defenses run on. Keeping them steady supports your body's resilience, which matters most when you're already run down. (established evidence)
- Kidneys — Your kidneys quietly filter your blood and balance the minerals your body runs on, day and night. This view simply shows where those minerals are coming from today — a varied, balanced diet is what keeps the mix steady. (emerging evidence)
- Digestion — Your gut does the daily work of turning food into fuel and keeping things moving comfortably. These nutrients support a smooth, regular rhythm and a healthy gut lining. (emerging evidence)
- Hair & Nails — Hair and nails are among the last places your body spends nutrients, so they often show the strain first. A steady supply of these supports strength and healthy growth. (emerging evidence)
- Blood Sugar — Even, well-fueled energy depends on how your body handles the sugar in your food. These nutrients support the steady blood-sugar balance that keeps energy from spiking and crashing. (emerging evidence)
Goals it supports
- Better sleep (emerging evidence)
- Weight management (emerging evidence)
- Muscle building (emerging evidence)
- Healthy aging (established evidence)
- Athletic performance (emerging evidence)
- General wellness (established evidence)
- Muscle & recovery (emerging evidence)
- Clear skin (emerging evidence)
- Cycle support (emerging evidence)
- Menopause support (established evidence)
- Mood support (emerging evidence)
Frequently asked questions
How much Vitamin D do adult women need per day?
Adult women (19–50) need 600 IU of Vitamin D per day, per NIH/NASEM Dietary Reference Intakes.
How much Vitamin D do adult men need per day?
Adult men (19–50) need 600 IU of Vitamin D per day, per NIH/NASEM Dietary Reference Intakes.
Does pregnancy change how much Vitamin D you need?
No — the recommended amount stays at 600 IU per day during pregnancy (ages 19–50).
Is there an upper limit for Vitamin D?
Yes — for adults 19–50, the tolerable upper limit is 4000 IU. Sustained excess vitamin D can raise blood calcium, leading to nausea, weakness, confusion, and kidney problems.
What foods are highest in Vitamin D?
Good sources include Salmon and trout, Sardines, Egg yolks, Fortified milk and plant milks, and Sunlight exposure.
How Tavita handles this
Tavita logs Vitamin D from both the food you eat and the supplements you take, adding both into one running daily total. It warns you before you reach the tolerable upper limit, counting your combined intake from food and supplements.
Sources
Figures on this page come from the NIH Office of Dietary Supplements fact sheets and the National Academies of Sciences, Engineering, and Medicine (NASEM) Dietary Reference Intake tables — the same dataset that powers the Tavita app. They were independently re-verified by blind re-derivation on August 9, 2026. See the methodology page for how this library is built and kept current.
Tavita is not a medical provider. This page is educational information, not medical advice — talk to your clinician before changing your supplement or medication routine.