Vitamin D3
Pick your strength first. Within each strength the cheapest is listed first, priced per 1,000 IU so different bottles compare fairly. Stronger softgels usually cost far less per IU at about the same bottle price, which is why we never compare across strengths. Where one strength is sold in two formats, such as softgels and a liquid, each is ranked on its own.
1,000 IU per serving
10 products| Brand | Per 1,000 IU | Bottle | Verification |
|---|---|---|---|
| BulkSupplements.com 500 softgels · cheapest here D · None located | 4.59¢ + delivery | $22.97 | D · None located |
| Nutricost 240 softgels D · None located | 6.24¢ + delivery | $14.97 | D · None located |
| Sports Research 360 softgels D · None located | 6.51¢ delivered | $15.95 last known price, Oct 17, 2026 | D · None located |
| Nature Made 300 softgels A · Certified | 9.10¢ delivered | $19.29 | A · Certified |
| Nature Made 180 softgels A · Certified | 11.4¢ delivered | $12.49 | A · Certified |
| Nature Made 100 softgels A · Certified | 16.6¢ delivered | $8.59 | A · Certified |
| Thorne 180 capsules C · Claimed | 18.3¢ delivered | $33.00 | C · Claimed |
| Thorne 90 capsules C · Claimed | 18.9¢ delivered | $17.00 | C · Claimed |
| MegaFood 90 tablets Second active this price does not pay for: food blend 724 mg (organic brown rice, S. cerevisiae, organic parsley leaf, organic broccoli, organic carrot, organic beetroot) D · None located | 30.0¢ + delivery | $26.99 | D · None located |
| MegaFood 60 tablets Second active this price does not pay for: food blend 724 mg (organic brown rice, S. cerevisiae, organic parsley leaf, organic broccoli, organic carrot, organic beetroot) D · None located | 35.0¢ + delivery | $20.99 | D · None located |
2,000 IU per serving, capsules, softgels and tablets
8 products| Brand | Per 1,000 IU | Bottle | Verification |
|---|---|---|---|
| Nutricost 240 softgels · cheapest here D · None located | 3.12¢ + delivery | $14.97 | D · None located |
| Sports Research 360 softgels D · None located | 3.53¢ delivered | $17.95 last known price, Oct 17, 2026 | D · None located |
| Nature Made 250 softgels A · Certified | 6.34¢ delivered | $23.69 | A · Certified |
| Nature Made 90 softgels A · Certified | 10.6¢ delivered | $10.99 | A · Certified |
| Momentous 60 capsules A · Certified | 16.7¢ + delivery | $19.99 | A · Certified |
| MegaFood 90 tablets Second active this price does not pay for: food blend 605 mg (S. cerevisiae, organic brown rice, organic broccoli, organic parsley leaf, organic carrot, organic beetroot) D · None located | 18.9¢ + delivery | $33.99 | D · None located |
| MegaFood 60 tablets Second active this price does not pay for: food blend 605 mg (S. cerevisiae, organic brown rice, organic broccoli, organic parsley leaf, organic carrot, organic beetroot) D · None located | 21.7¢ + delivery | $25.99 | D · None located |
| Micro Ingredients 500 softgels D · None located | Out of stock | $23.95 last price, out of stock checked Oct 27, 2026 | D · None located |
2,000 IU per serving, gummies and chewables
4 products| Brand | Per 1,000 IU | Bottle | Verification |
|---|---|---|---|
| Nature Made 75 servings · cheapest here A · Certified | 16.9¢ delivered | $17.29 | A · Certified |
| Nature Made 45 servings A · Certified | 21.9¢ delivered | $11.69 | A · Certified |
| Nature Made 55 servings A · Certified | 24.5¢ delivered | $18.99 | A · Certified |
| MegaFood 35 servings Second active this price does not pay for: organic orange and super food blend 120 mg (organic orange, organic cranberry fruit, organic blueberry fruit, organic ginger root) D · None located | Out of stock | $13.99 last price, out of stock checked Oct 27, 2026 | D · None located |
2,500 IU per serving
1 product| Brand | Per 1,000 IU | Bottle | Verification |
|---|---|---|---|
| BulkSupplements.com 500 softgels D · None located | 1.76¢ + delivery | $21.97 | D · None located |
4,000 IU per serving, capsules, softgels and tablets
1 product| Brand | Per 1,000 IU | Bottle | Verification |
|---|---|---|---|
| Sports Research 360 softgels D · None located | 1.77¢ delivered | $17.95 last known price, Oct 17, 2026 | D · None located |
4,000 IU per serving, liquids
1 product| Brand | Per 1,000 IU | Bottle | Verification |
|---|---|---|---|
| Thorne 30 servings D · None located | 20.0¢ delivered | $24.00 | D · None located |
5,000 IU per serving, capsules, softgels and tablets
12 products| Brand | Per 1,000 IU | Bottle | Verification |
|---|---|---|---|
| Micro Ingredients 500 softgels · cheapest here D · None located | 0.96¢ + delivery | $23.95 | D · None located |
| BulkSupplements.com 500 softgels A · Certified | 1.12¢ + delivery | $27.97 | A · Certified |
| Nutricost 240 softgels D · None located | 1.25¢ + delivery | $14.97 | D · None located |
| BulkSupplements.com 365 softgels A? · package unconfirmed | 1.42¢ + delivery | $25.97 | A? · package unconfirmed |
| Sports Research 360 softgels D · None located | 1.47¢ delivered | $18.95 last known price, Oct 17, 2026 | D · None located |
| Nature Made 180 softgels A · Certified | 3.22¢ delivered | $28.99 | A · Certified |
| Nutricost 60 capsules D · None located | 3.99¢ + delivery | $11.97 | D · None located |
| Nature Made 90 softgels A · Certified | 5.78¢ delivered | $17.99 | A · Certified |
| Momentous 60 capsules A · Certified | 6.33¢ + delivery | $18.99 | A · Certified |
| Thorne 120 capsules A · Certified | 6.50¢ delivered | $39.00 | A · Certified |
| Thorne 60 capsules A · Certified | 6.67¢ delivered | $20.00 | A · Certified |
| Nature Made 70 tablets D · None located | 7.71¢ delivered | $18.99 | D · None located |
5,000 IU per serving, gummies and chewables
3 products| Brand | Per 1,000 IU | Bottle | Verification |
|---|---|---|---|
| Nutricost 60 servings · cheapest here D · None located | 5.32¢ + delivery | $15.97 | D · None located |
| Nature Made 75 servings A · Certified | 8.77¢ delivered | $32.89 | A · Certified |
| Nature Made 40 servings A · Certified | 14.2¢ delivered | $20.39 | A · Certified |
10,000 IU per serving
5 products| Brand | Per 1,000 IU | Bottle | Verification |
|---|---|---|---|
| Nutricost 240 softgels · cheapest here D · None located | 0.79¢ + delivery | $18.97 | D · None located |
| Sports Research 120 softgels D · None located | 1.87¢ delivered | $14.95 last known price, Oct 17, 2026 | D · None located |
| Thorne 60 capsules C · Claimed | 4.33¢ delivered | $26.00 | C · Claimed |
| Nature Made 60 softgels D · None located | 4.83¢ delivered | $20.99 | D · None located |
| BulkSupplements.com 500 softgels D · None located | Out of stock | $17.97 last price, out of stock checked Oct 27, 2026 | D · None located |
50,000 IU per serving
1 productNot a daily dose. Products at these strengths are sold to be taken weekly or monthly, so there is no pick here. The per-unit price is shown and the comparison stops there.
| Brand | Per 1,000 IU | Bottle | Verification |
|---|---|---|---|
| BulkSupplements.com 365 softgels D · None located | 0.14¢ + delivery | $24.97 | D · None located |
Common questions
Which vitamin D3 brands are third-party tested?
Every vitamin D3 and D3 + K2 we track, grouped by whether a certifier lists the exact bottle, another size, or nothing we found. Absence is not a verdict.
Vitamin D3 1,000 IU vs 5,000 IU: which costs less?
What each strength costs per 1,000 IU, read from the labels and the prices we hold. A price comparison only: we do not say which strength anyone should take.
How much more does vitamin D3 with K2 cost?
What adding K2 costs, brand by brand at the same strength: bottle against bottle where a brand sells the same count both ways, and per 1,000 IU of D3 where it does not.
Is BulkSupplements vitamin D3 NSF certified?
Which BulkSupplements D3 softgels NSF Certified for Sport names, at which bottle sizes, and which it does not, with the listing IDs.
Is Momentous vitamin D3 NSF certified?
Which Momentous vitamin D3 bottles we price NSF Certified for Sport names at the exact package. The listing IDs, the strengths and what each covers.
Do third-party tested supplements cost more?
Per category, the cheapest product we track beside the cheapest a certifier names at the exact package, if any, within one format and, where it matters, one strength.
Is BulkSupplements third party tested?
Every BulkSupplements product we track, by whether a certifier names the exact package sold, only another size, or nothing we found. With listing IDs.
Is Thorne vitamin D NSF certified?
Thorne D-1,000, D-5,000, D-10,000 and the liquids checked against NSF Certified for Sport: which bottles a listing names, with the listing IDs.
What is the cheapest NSF certified vitamin D3?
Every plain vitamin D3 we track whose exact bottle NSF names in its Certified for Sport database, compared on cost per 1,000 IU within each strength, with D3 + K2 ranked apart.
Is Thorne third party tested?
Every Thorne product we price, checked in NSF’s Certified for Sport database: which listing names the exact package sold, with the listing IDs.
Is Momentous third party tested?
Every Momentous product we price, checked in NSF’s Certified for Sport database: where a listing names the exact package, and where it names another size.
Which supplements are NSF Certified for Sport?
Every package we price that NSF names in its Certified for Sport database, by category, with the listing IDs and what each listing actually covers.
What is the cheapest vitamin D3?
The cheapest plain vitamin D3 at each labeled strength, priced per 1,000 IU from its own label, with whether that package is third-party tested.
Do supplement prices actually change?
We keep every price reading we take: daily where a store can be read automatically, less often where it is read by hand. Which prices have moved since we started, which have not, and by how much.
How many capsules is one serving?
How many pills the label calls one serving, across every capsule, tablet and softgel we have a price for, and what that does to the count on the front of the bottle.
Is a vitamin D3 label in mcg the same as one in IU?
Convert vitamin D3 mcg to IU and back, checked against every label we price: one mcg is 40 IU, so 25 mcg is 1,000 IU and 125 mcg is 5,000 IU.
Is MegaFood third party tested?
Every MegaFood product we price, checked in the NSF, USP and Informed databases: which listing names the exact package sold, and which we found no listing for.
Is Sports Research third party tested?
Every Sports Research product we track, checked in the certifier databases: which program lists each one, and which no database we searched lists.
Is Nature Made third party tested?
Every Nature Made product we price, checked against USP’s Verified Products directory, NSF’s Certified for Sport database and its own label, product by product.
Is Nature Made vitamin D3 USP Verified?
Nature Made vitamin D3, every strength and count we price, checked against USP’s Verified directory and the USP Verified Mark on each bottle’s label.
About these numbers
What “per dose” means here: 1,000 IU vitamin D3
1,000 IU (25 mcg) sits just above the adult RDA of 600 IU (800 IU over 70) and well below the tolerable upper intake level of 4,000 IU/day, so it works as a shared unit across products sold from 1,000 IU to 50,000 IU per serving. Signed off by Dan on September 9, 2026 as the category's yardstick. It is a round number chosen for price comparison, not a recommended intake.
Compared in IU. 1 mcg = 40 IU; labels use both.
Source: NIH Office of Dietary Supplements, Vitamin D - Health Professional Fact Sheet · checked Aug 25, 2026 · verified by Dan
Where the data comes from
Every claim links to its source. Products, prices and certification listings are read from the retailers' own stores and the certifiers' own databases, and each figure links to the record it came from, so you can check any of them.
- Where a servings-per-container figure was not read from the package's own panel, the product page says how it was worked out.
- Amazon and Walmart are not included, so “cheapest” means cheapest among the retailers we track.
- Prices go stale. Each one shows when it was last checked, and says so when it is older than the retailer allows us to cache it.
- iHerb prices cannot be refreshed automatically. iHerb has not given us access to its price data, so those prices are marked stale until they are re-read. Each retailer offer carries its own check date.
Found something wrong? Tell us. Corrections are the point.
How we make money
No Buy button on this page earns us anything. The only links on the site that can are the Amazon links shown below the price comparison on some product pages, outside the comparison, and each says so beside it.
Commission will play no part in what we list, how it ranks, or which link we send you to. The Buy button points at the lowest price we have recorded even when that retailer pays us nothing.