Vitamin A + Vitamin D3

Can you take Vitamin A and Vitamin D3 together?

NoteMechanism-based

Yes at normal doses; avoid high-dose retinol.

What to do. Keep preformed vitamin A under the 3,000 mcg upper limit.

Dose matters. Your vitamin A dose is at or above the upper limit.

Mechanism

High-dose vitamin A may blunt vitamin D

Retinoic acid and vitamin D share a nuclear-receptor partner (RXR). Very high retinol intakes are associated with lower bone density and may counteract some vitamin D effects; human data are mixed.

Evidence: Mechanism-based — Plausible biological mechanism with little direct human outcome data.

  1. 01NIH Office of Dietary Supplements — Vitamin A Fact Sheet for Health Professionals
  2. 02NIH Office of Dietary Supplements — Vitamin D Fact Sheet for Health Professionals

Timing

A day with Vitamin A and Vitamin D3

  1. 08:00

    Breakfast

    with meal

Taking more than these two?

Add the rest of your stack and your medications for a complete check.

Check my full stack

Buying guide

What to look for on the label

  • Vitamin A

    • Beta-carotene or mixed carotenoids if you just want coverage
    • Retinyl palmitate only if you have a specific need

  • Vitamin D3

    • D3 (cholecalciferol) rather than D2
    • Oil-based softgels

Related

Other interactions

Omega-3 (Fish Oil) + Vitamin A

Fat-soluble vitamin A absorbs better with fat

Synergy→

Vitamin D3 + Vitamin K2

D3 makes calcium-binding proteins; K2 activates them

Synergy→

Magnesium + Vitamin D3

Magnesium is required to activate vitamin D

Synergy→

Calcium + Vitamin D3

Vitamin D increases calcium absorption

Synergy→

Omega-3 (Fish Oil) + Vitamin D3

Dietary fat improves vitamin D3 absorption

Synergy→

Learn more about Vitamin A and Vitamin D3.