Vitamin A
Today
30-day average. Months to years of reserve, so only a sustained trend is meaningful.
What it is
Runs low-light vision, and keeps skin and immune barriers intact.
Reference intake
Your daily target, personalised to your age and sex.
- RDA
- 900 mcgmale_19_plus
- Upper limit
- 3000 mcgapplies to fortified-and-supplemental
Applies to PREFORMED vitamin A (retinol) only. Beta-carotene and the other provitamin A carotenoids have no upper limit — the body regulates their conversion. Since this app tracks vitamin A as RAE, which includes that conversion, applying the limit to the total would flag a carrot as a hazard. It is not applied to intake from food.
Full write-up not finished
The reference intake above is real and cited — Vitamin A is assessed against it exactly like any other nutrient. What is missing is the written panel: what it does in detail, what deficiency and excess look like, absorption, interactions, and food sources ranked against what you eat.
Entries live in data/nutrients.json. Filling this one in changes no code.
Sources
Last reviewed 2026-08-11