Nutrients · IU
Vitamin D
Vitamin D helps your body absorb calcium for bone strength, and supports immune function. It's one of the hardest nutrients to get from food alone — most people fall short without sun exposure or fortified foods.
How much you need
Values are for general adults and vary by age, sex, and life stage. S8D personalizes the exact target to your profile.
Where to get it
- Fatty fish (salmon, sardines)
- Fortified milk & plant milks
- Egg yolks
- Sunlight on skin
Common questions
How much Vitamin D do adults need?
Most adults need 600 IU for most adults (800 IU at 71+) of Vitamin D (measured in IU). The exact target depends on age, sex, and life stage — S8D personalizes it to your profile.
What is the tolerable upper limit for Vitamin D?
The tolerable upper limit is 4,000 IU. Staying under it avoids the risks of excess intake; S8D never builds a day that exceeds any nutrient's upper limit.
Which foods are high in Vitamin D?
Good sources include Fatty fish (salmon, sardines), Fortified milk & plant milks, Egg yolks, Sunlight on skin.
Why does Vitamin D matter?
Vitamin D helps your body absorb calcium for bone strength, and supports immune function. It's one of the hardest nutrients to get from food alone — most people fall short without sun exposure or fortified foods.