The Best Vitamin D Supplements of 2026
The best vitamin D supplement for most people is NatureWise Vitamin D3 2000 IU: one small softgel a day, about 4 cents a day on Amazon. It is on NSF/ANSI 173, a list that checks the bottle holds what the label says, and 2,000 IU covers most adults.
By Erin Rose Updated October 26, 2026 How we score
Our pick for: Most people
- Dose
- 2,000 IU50 mcg of vitamin D3
- A day
- $0.04Amazon price
- Bottle
- 360 softgels$14.44, about 12 months
- Testing list
- NSF/ANSI 173Checked September 29, 2026
- Form
- Small softgelVitamin D3 in olive oil
- Take
- One a dayWith a meal
Why we pick it 2,000 IU a day is the dose the largest vitamin D trial gave 25,871 adults for about five years (Manson 2019), and it stays under the 4,000 IU daily limit.
What you give up It is on NSF/ANSI 173, not USP Verified. Both lists check that the bottle holds what the label says. See the best vitamin D for your needs below.
The best vitamin D supplement for your needs
Best 5,000 IU, if your doctor says you are low: NatureWise D3 5000 IU
5,000 IU is above the 4,000 IU adult limit, so take it only on a doctor’s advice, usually after a low blood test. This is one small softgel in olive oil, and it is on NSF/ANSI 173. NOW D3 5000 IU costs about the same, $0.04 a day, but is not on a testing list we check.
NatureWise D3 5000 IU
$0.04 a day · 5,000 IU · NSF/ANSI 173
Best vitamin D with K2: Thorne Vitamin D + K2 Liquid
These drops give vitamin D3 with vitamin K2, and they are on NSF/ANSI 173, a list that checks the bottle holds what the label says. K2 is optional: no trial has tested D3 with K2 against D3 alone for broken bones or heart problems. More in vitamin D with or without K2. If you take warfarin, do not add K2 without your doctor (Schurgers 2007). Rather a softgel? Nature Made D3 + K2 is USP Verified but has 5,000 IU, so take it on a doctor’s advice (D3 5000 IU with K2).
Thorne Vitamin D + K2 Liquid
$0.11 a day for 2,000 IU (2 servings) + K2 · NSF/ANSI 173
Best vegan vitamin D: Garden of Life Vegan D3 Spray
Most vitamin D3 is made from lanolin, a wax from sheep’s wool. This spray’s D3 comes from lichen, a plant-like source, and it is certified organic. One spray gives 1,000 IU. It is not on a testing list we check.
Garden of Life Vegan D3 Spray
$0.09 a day · 1,000 IU · Vegan
How much vitamin D do you need?
Adults need 600 IU a day up to age 70 and 800 IU after that (Ross 2011). The upper limit for adults is 4,000 IU a day from all sources. A 1,000 to 2,000 IU supplement fills the gap for most people, even if they get little sun.
The shelf runs higher. We read 936 vitamin D labels: the middle one gives 1,000 IU a serving, and the top tenth give 5,000 IU or more, above the upper limit. For your own dose, see how much vitamin D to take.
9 vitamin D supplements compared
5 of the 9 products here are on a testing list (USP Verified or NSF/ANSI 173), which checks that the bottle holds what the label says. Those come first, then the rest, cheapest per 1,000 IU first at Amazon prices.
| Supplement | Cost per 1,000 IU | Why it is or is not a pick |
|---|---|---|
| NatureWise D3 5000 IU5,000 IU · $0.04 a day | $0.008 | Best 5,000 IU: NSF/ANSI 173; take on a doctor’s advice |
| NatureWise D3 2000 IU2,000 IU · $0.04 a day | $0.020 | Best overall: NSF/ANSI 173, under the upper limit |
| Nature Made D3 2000 IU2,000 IU · $0.07 a day | $0.035 | USP Verified |
| Thorne Vitamin D + K2 Liquid2,000 IU · $0.11 a day | $0.055 | Best with K2: NSF/ANSI 173, drops |
| Nature Made D3 + K25,000 IU · $0.42 a day | $0.084 | USP Verified; 5,000 IU; adds K2 |
| Viva Naturals D3 5000 IU5,000 IU · $0.03 a day | $0.006 | Not on a testing list we check; 5,000 IU |
| NOW D3 5000 IU5,000 IU · $0.04 a day | $0.008 | Not on a testing list we check; 5,000 IU |
| Garden of Life Vegan D3 Spray1,000 IU · $0.09 a day | $0.090 | Best vegan: D3 from lichen |
| Nordic Naturals D3 1000 IU1,000 IU · $0.13 a day | $0.13 | Not on a testing list we check |
Questions people ask
Is vitamin D3 better than D2?
Yes, for raising your blood level. In a 12-week winter trial of 335 women taking 600 IU a day, D3 raised blood vitamin D more than D2 (Tripkovic 2017). Every pick on this page is D3. D2 vs D3.
Is 5,000 IU of vitamin D too much?
It is above the 4,000 IU a day upper limit for adults, so take it only on a doctor’s advice. Doctors use higher doses for a set time to fix a low level. Vitamin D side effects.
When is the best time to take vitamin D?
Any time you will remember, with a meal that has some fat. In a small study of older adults given one large dose, vitamin D in the blood peaked 32% higher when they took it with a meal that had fat (Dawson-Hughes 2015). Best time to take vitamin D.
Do I need a blood test before taking vitamin D?
Not for most people taking 2,000 IU or less. The Endocrine Society’s 2024 guideline advises against routine vitamin D testing for healthy adults. Your doctor may test if you have a condition that affects vitamin D. The vitamin D blood test.
How other guides picked
Healthline’s top pick, in its guide updated November 2025, is a 10,000 IU capsule. That is more than twice the 4,000 IU adult upper limit, so we would not suggest it without a doctor. We pick a 2,000 IU softgel on a testing list, at a dose most adults can take every day.
More on vitamin D
By strength: 1,000 vs 5,000 IU and 5,000 IU with K2. Brands: Nature Made vs NOW Foods. Testing: third-party tested vitamin D. Everything else: the vitamin D guide.
How we picked
We scored 19 vitamin D supplements on dose, testing lists and cost, and compare the 9 most useful here. We checked USP Verified, NSF/ANSI 173, NSF Certified for Sport, Informed Sport and Informed Choice for each product on September 29, 2026, and priced each on Amazon on October 30, 2026. We pick D3 at a dose under the upper limit, on a testing list, at a fair cost per day. Our method.
Sources
- Ross AC, et al. “The 2011 report on dietary reference intakes for calcium and vitamin D from the Institute of Medicine: what clinicians need to know.” J Clin Endocrinol Metab. 2011. PubMed 21118827
- Manson JE, et al. “Vitamin D supplements and prevention of cancer and cardiovascular disease.” N Engl J Med. 2019. PubMed 30415629
- Tripkovic L, et al. “Daily supplementation with 15 μg vitamin D2 compared with vitamin D3 to increase wintertime 25-hydroxyvitamin D status in healthy South Asian and white European women: a 12-wk randomized, placebo-controlled food-fortification trial.” Am J Clin Nutr. 2017. PubMed 28679555
- Dawson-Hughes B, et al. “Dietary fat increases vitamin D-3 absorption.” J Acad Nutr Diet. 2015. PubMed 25441954
- Schurgers LJ, et al. “Vitamin K-containing dietary supplements: comparison of synthetic vitamin K1 and natto-derived menaquinone-7.” Blood. 2007. PubMed 17158229
- Demay MB, et al. “Vitamin D for the Prevention of Disease: An Endocrine Society Clinical Practice Guideline.” J Clin Endocrinol Metab. 2024. PubMed 38828931
- NIH Office of Dietary Supplements, “Vitamin D: Fact Sheet for Health Professionals.” ods.od.nih.gov
- Testing lists, read September 29, 2026: USP Verified, NSF/ANSI 173, NSF Certified for Sport, Informed Sport and Informed Choice. Labels: NIH Dietary Supplement Label Database.