Is BulkSupplements vitamin D3 NSF certified?
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.
Partly: 1 of the 6 we track, not all of them. NSF lists a specific package against each certificate, and a certificate is what NSF actually stands behind, so a package the listing does not name is treated as unconfirmed rather than certified. Every row below was read against NSF's own listing, and the listing ID is shown.
The single listing names the 5,000 IU softgel in its 500-count bottle. Strength is the trap here: the 1,000, 2,500, 10,000 and 50,000 IU softgels on the same product page have no listing, and neither do any of the D3 + K2 softgels.
| Product | Package | Named by an NSF listing? | Certificate |
|---|---|---|---|
| Vitamin D3 1,000 IU Softgels (500 count) buy | 500 softgels | No listing found | Unknown |
| Vitamin D3 2,500 IU Softgels (500 count) buy | 500 softgels | No listing found | Unknown |
| Vitamin D3 5,000 IU Softgels (500 count) buy | 500 softgels | Yes | 1823428 |
| Vitamin D3 5,000 IU Softgels (365 count) buy | 365 softgels | Listed at another size | 1823428 |
| Vitamin D3 10,000 IU Softgels (500 count) buy | 500 softgels | No listing found | Unknown |
| Vitamin D3 50,000 IU Softgels (365 count) buy | 365 softgels | No listing found | Unknown |
What the listings say
BulkSupplements holds 1 Certified for Sport listing covering the products in this table (1823428). NSF records some brands under more than one spelling, so a search on the brand name alone can miss a listing; ours are found from a full read of the directory, then opened one by one.
4 products here have no NSF listing at all. That is an absence in a database, not a failed test: most supplements have never been independently tested, and NSF Certified for Sport is one program among several.
What each product page shows
Every BulkSupplements product we track, across all categories: Is BulkSupplements third party tested?
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.
How these lines are chosen
Among 2 products and 2 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. No product here publishes a delivery rate below its free-delivery threshold, so the pick is priced before delivery.
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.