Vitamin D3

Dose, D3 vs D2, and pairing with K2.

#1NOW Foods Vitamin D-3 5000 IU
$8-$14 / 240ct · 4.8★

High-dose D3 softgels in a cottonseed-oil base — the value benchmark.

  • Cheapest cost-per-IU
  • Oil-based softgel aids absorption
  • GMP / non-GMO
#2Nature Made Vitamin D3 2000 IU
$8-$15 · 4.8★

USP-verified D3 at a moderate, everyday dose for general maintenance.

  • USP verified
  • Moderate 2000 IU daily dose
  • Cheap and everywhere
#3Sports Research Vitamin D3 + K2
$18-$28 · 4.8★

D3 5000 IU paired with K2 (MK-7) in coconut oil for directing calcium correctly.

  • D3 + K2 pairing for calcium handling
  • Coconut-oil base for absorption
  • Non-GMO, third-party tested

Frequently Asked Questions

How much vitamin D should I take?

1000–2000 IU/day suits most adults for maintenance; higher doses (e.g., 5000 IU) are used to correct deficiency. A blood test is the only way to dose precisely.

Do I need vitamin K2 with my D3?

K2 helps direct calcium to bone rather than arteries. It is a sensible pairing, especially at higher D3 doses, though a varied diet already supplies some K2.