Vitamin

Vitamin A

Vitamin A requires 700 mcg RAE daily for adult women and 900 mcg RAE for men. The tolerable upper intake level is 3000 mcg RAE from supplements. It works best alongside Vitamin A (retinol).

Last reviewed: 2026-09-20Reviewed by: StackingRight clinical reviewPrimary source

What Vitamin A does

Supports vision, immune defence and skin integrity; required for gene transcription.

The UL applies to preformed retinol only, not beta-carotene. Pregnancy risk at high doses.

How much you need

Reference intakes for Vitamin A in adults
MeasureAdult maleAdult female
Recommended intake900 mcg RAE700 mcg RAE
Upper intake level3000 mcg RAE (supplemental only)
Typical supplement dose1500-3000 mcg RAE

Interactions involving Vitamin A

1 sourced rule
Interaction rules involving Vitamin A
PairSeverityMechanismAction
Vitamin A (retinol) × Avocado / olive oilSynergyVitamin A is fat-soluble and absorbed in chylomicrons, so it needs dietary fat at the same meal.Take vitamin A with a fat-containing meal, and never on an empty stomach.Source

Questions people ask about Vitamin A

Sources