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Vitamin D supplements, compared

10 products we’ve reviewed list vitamin d as a key ingredient. Here’s what it does, what the research uses — and how much each product actually contains.

What it is

Helps the body absorb calcium and maintain bones. It is made in skin exposed to sunlight and found naturally in few foods.

What the research uses

Adults need 15–20 mcg (600–800 IU) a day. The upper limit for adults is 100 mcg (4,000 IU) a day.

Educational information, not medical advice. Talk to a healthcare professional before starting a supplement, especially if you are pregnant, nursing or take medication.

Every product, dose by dose

ProductVitamin D per servingFormScore
Vitamin D3 2000 IU Softgels
Nature MadeVitamin D3 2000 IU Softgels
USP Verified
50 mcg (2,000 IU)Vitamin D3 (as cholecalciferol)Softgel9.0
Multi for Him
Nature MadeMulti for Him
USP Verified
25 mcg (1,000 IU)Vitamin D3 (as cholecalciferol)Tablet8.5
Basic Nutrients 2/Day
ThorneBasic Nutrients 2/Day
NSF Certified for SportNSF Contents Certified
50 mcg (2,000 IU)Vitamin D3 (cholecalciferol)Capsule8.2
Adults Multivitamin
CentrumAdults Multivitamin		25 mcg (1,000 IU)Vitamin D3 (cholecalciferol)Tablet8.0
Creatine HMB
Transparent LabsCreatine HMB
NSF Certified for SportInformed Choice
12.5 mcg (500 IU)Vitamin D3Powder7.8
Vitamin D3 + K2 (5000 IU)
Sports ResearchVitamin D3 + K2 (5000 IU)
Non-GMO Project VerifiedCertified VeganThird-party testedcGMP facility
125 mcg (5,000 IU)Vitamin D3 (cholecalciferol from lichen, VegaDELight)Softgel7.8
Essential for Women 18+
RitualEssential for Women 18+
USP VerifiedNon-GMO Project VerifiedClean Label Project
50 mcg (2,000 IU)Vitamin D3 (cholecalciferol from lichen)Capsule7.5
Women's Multi
OLLYWomen's Multi
NSF Contents Certified
20 mcg (800 IU)Vitamin D (as cholecalciferol)Gummy7.3
Superfoods Greens Gummies
GrünsSuperfoods Greens Gummies
Third-party testedcGMP facility
20 mcgVitamin D3 (as cholecalciferol)Gummy6.8
Liquid Morning Multivitamin
MaryRuth'sLiquid Morning Multivitamin
Clean Label Project
20 mcg (800 IU)Vitamin D (as cholecalciferol)Liquid6.5

Amounts are per serving as printed on each label. “Not disclosed” usually means the ingredient sits inside a proprietary blend.

Questions people ask

How much vitamin d do studies use?
Adults need 15–20 mcg (600–800 IU) a day. The upper limit for adults is 100 mcg (4,000 IU) a day.
Which vitamin d supplement scores highest?
In our reviews, Nature Made Vitamin D3 2000 IU Softgels scores highest at 9.0/10, followed by Nature Made Multi for Him (8.5) and Thorne Basic Nutrients 2/Day (8.2). Scores weigh efficacy, quality, value, experience and transparency — not just the dose.
How much vitamin d is in these products?
It varies by product and serving size — for example Nature Made Vitamin D3 2000 IU Softgels (50 mcg (2,000 IU)), Nature Made Multi for Him (25 mcg (1,000 IU)), Thorne Basic Nutrients 2/Day (50 mcg (2,000 IU)). The table above lists the amount per serving for every product we've reviewed.

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