Is Thorne collagen NSF certified?
Partly: 1 of the 2 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.
| Product | Package | Named by an NSF listing? | Certificate |
|---|---|---|---|
| Collagen Fit, Unflavored (30 servings) buy | 30 servings | Yes | 1502565 |
| Collagen Plus, Passion Berry (30 servings) buy | 30 servings | No listing found | Unknown |
What the listings say
Thorne holds 1 Certified for Sport listing covering the products in this table (1502565). 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.
One product here has 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 Thorne product we track, across all categories: Is Thorne third party tested?
Where to buy: the collagen peptides shortlist
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. Any answer shown beside it is the cheapest under a different rule and says so on its own line; answers that cost more than the pick fold under one line until you ask for them.
How these lines are chosen
Among 33 products and 33 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 “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below.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: Collagen Peptides. 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.