What is the cheapest vitamin D3?
Our picks, by labeled strength, with a link to buy them: see where to buy. A strength with nothing certified at it has no pick, and is not listed there.
There is a cheapest at every strength, and they are different products. We can price 34 vitamin D3 packages across 7 labeled strengths, and the winner changes as you move between them. The cheapest at 1,000 IU is $0.044 per 1,000 IU and the cheapest at 10,000 IU is $0.004, before delivery, and every strength in between sits between the two. That is arithmetic, not a reason to buy a stronger softgel.
Which is why this page ranks inside each strength rather than across all of them. Strength is not a thing to choose on price, and 1,000 IU is the unit this site prices vitamin D3 against, not an amount anyone should take. Pick the row at the strength you already buy. What the jump between two strengths actually costs is its own page.
| Labeled strength | Cheapest per 1,000 IU | Packages we price | Cheapest package | Tested? |
|---|---|---|---|---|
| 1,000 IU | $0.044 | 10 | Sports Research Vitamin D3 1,000 IU (360 softgels) buy | D · None located |
| 2,000 IU | $0.025 | 5 | Sports Research Vitamin D3 2,000 IU (360 softgels) buy | D · None located |
| 2,500 IU | $0.018 | 1 | BulkSupplements.com Vitamin D3 2,500 IU Softgels (500 count) buy | D · None located |
| 4,000 IU | $0.012 | 2 | Sports Research Vitamin D3 4,000 IU (360 softgels) buy | D · None located |
| 5,000 IU | $0.01 | 11 | Micro Ingredients Vitamin D3 5,000 IU (500 softgels) buy | D · None located |
| 10,000 IU | $0.004 | 4 | BulkSupplements.com Vitamin D3 10,000 IU Softgels (500 count) buy | D · None located |
50,000 IU: priced, never picked. Not 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.
- BulkSupplements.com Vitamin D3 50,000 IU Softgels (365 count), $0.001 per 1,000 IU
17 more packages pair vitamin D3 with vitamin K2. They are priced the same way and are not in the table above, because a package with a second active ingredient is not the same purchase. What adding K2 costs is its own page, and every D3 + K2 package we track is listed separately.
Every price is per 1,000 IU of vitamin D3 as the product's own Supplement Facts panel states it, before delivery, and is the price we last recorded at the retailer named on each product page. The cheapest row at a strength and the cheapest certified row at it are often different products; the Tested column says which this one is, and the certified ranking is separate.
Where to buy: the picks, by labeled strength
The pick is the cheapest certified product, at the exact package sold where the certifier names packages, with no adverse finding on record, a price its retailer let us read recently, and no more than a year’s supply at the label’s serving; per delivered dose where the retailer publishes a delivery rate. Where none does, it is the cheapest such product before delivery, and it says how far the order is from free delivery. It is the same pick the category page shows.
How these lines are chosen
Among 10 products and 10 retailer listings we track; Amazon and Walmart are not included. A month is thirty doses of the size in the heading, priced the same way as the per-dose figure beside it. “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below.
How these lines are chosen
Among 6 products and 6 retailer listings we track; Amazon and Walmart are not included. A month is thirty doses of the size in the heading, priced the same way as the per-dose figure beside it. “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below.
How these lines are chosen
Among 11 products and 11 retailer listings we track; Amazon and Walmart are not included. A month is thirty doses of the size in the heading, priced the same way as the per-dose figure beside it. “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below.
Full comparison of every product in this category: Vitamin D3. Every question we answer: the question index.
What this rests on: prices we last recorded at the retailer named on each product page, which go stale, and each page says when it was checked; the products we track, not every product sold, and Amazon and Walmart are not among the stores; listings and labels read at the source, each linked from the page. Found an error? Tell us. The full method: How we compare.