Best Vitamin D Brands in 2026 — Ranked by Trust Score

Vitamin D is the most commonly deficient vitamin in the U.S. We ranked 3172 brands that sell vitamin D by certifications and safety data.

What to Look for in Vitamin D Supplements

• D3 (cholecalciferol) over D2 (ergocalciferol) — D3 is more effective at raising blood levels.
• Dosage — Most studies use 1,000-5,000 IU daily. Many cheap multivitamins only include 400 IU.
• With fat or oil — Vitamin D is fat-soluble. Softgels with oil (olive oil, MCT) absorb better than dry tablets.
• USP or NSF certification — Nature Made vitamin D is USP verified. Kirkland Signature is also USP verified.
• Third-party testing — Ensures the label amount is accurate. Studies have found vitamin D supplements ranging from 9% to 146% of labeled amount.

Top Vitamin D Brands by Trust Score