SUPPLEMENT TESTING

Are Thorne, Momentous and BulkSupplements third-party tested? 17 supplements checked

“Third-party tested” on a product page can mean almost anything. A certifier’s listing is a record you can look up. We checked the 17 supplements we reviewed against NSF’s public databases and Informed Choice’s list on November 6, 2026: which listing, how many lots, and where the answer is thin. Our supplements guide covers fifteen of these 17.

By Porsche Ma Explainer Updated Nov 7, 2026

The bottom line

Thorne, Momentous, Klean, Nordic Naturals, AG1 and Transparent Labs each have reviewed products in NSF’s Certified for Sport database. Thorne’s four list lots you can match. Most Momentous entries say “All”. BulkSupplements’ magnesium lists one lot, for a 1 kg package.

See our third-party-tested supplements picks →

Our reviews rest on published sources, not hands-on testing. Our method

Porsche also cofounded Superhuman Chambers, which sells hyperbaric chambers · About the author. This is general information, not medical advice, and no clinician has reviewed it.

Stock photo: Supliful - Supplements On Demand / Unsplash

In this article

Are Thorne, Momentous and BulkSupplements third-party tested?

Yes for Thorne and Momentous, with a difference in what you can check. Each Thorne product we reviewed is in NSF’s Certified for Sport database with 21 to 70 lot numbers you can match to your container^10–13. Momentous’s creatine 450 g entry lists 28 lots, and its other entries say “All” in the lot field instead^{14, 16, 17, 19, 20}.

BulkSupplements is the weak case. Its Magnesium Glycinate is in NSF’s Certified for Sport database with one lot number, for a 1 kg package, and in NSF’s dietary supplement listing with no lot numbers^{3, 36}. The review covers a 500 g bag. Its unflavored creatine lists five lots across packages from 100 g to 1 kg³⁷.

A mark on a product page is a claim. A certifier’s listing is a record you can open. A lot number on your container that appears on that listing is the check that ties your purchase to it. The table gives the result for each brand. For what the same products cost together a month, see the supplement stack cost page.

What a certifier lists for the 17 supplements we reviewed, checked November 6, 2026
Brand	Reviewed products checked	Where it is listed	Lots on the list
Thorne	Creatine, Magnesium Bisglycinate, Vitamin D-5,000, Whey Protein Isolate	NSF Certified for Sport^10–13	70, 21, 44 and 23, matched by lot number
Momentous	Creatine, Magnesium Bisglycinate, Omega-3, Whey Protein Isolate, Daily Hydration	NSF Certified for Sport^{14, 16, 17, 19, 20}	28 for the creatine 450 g entry. “All” for the rest
Klean Athlete	Klean Creatine, Klean Magnesium, Klean Omega	NSF Certified for Sport, two entries for each^{24, 26, 28}	Split across the two entries of each product
Nordic Naturals	Ultimate Omega 2X Sport, Vitamin D3 Gummies Sport	NSF Certified for Sport^{30, 32}	11 for the fish oil. 4 and 5 for the gummies, under two codes
AG1	AG1 Next Gen	NSF Certified for Sport, NSF dietary supplement listing and Informed Choice^{4, 6, 34}	72
Transparent Labs	Creatine HMB	NSF Certified for Sport, NSF dietary supplement listing and Informed Choice^{5, 6, 35}	14 for the unflavored version
BulkSupplements	Magnesium Glycinate	NSF Certified for Sport and NSF dietary supplement listing^{3, 36}	1, for a 1 kg package

Claim, listing, lot: three different things

“Third-party tested” isn’t a certification. It’s a maker’s statement, and it doesn’t say which lab, which tests or which lots. FDA doesn’t have the authority to approve dietary supplements before they’re marketed, and manufacturers and distributors carry the initial responsibility for their products’ safety².

NSF’s Certified for Sport program says it verifies four things: no substances from a list of 290 banned by major athletic organizations, contents that match the label, no unsafe levels of contaminants, and manufacture at a GMP-certified facility NSF audits¹. A product’s listing can carry a lot list.

NSF keeps a second record, its dietary supplement listing under NSF/ANSI Standard 173 at info.nsf.org. It says NSF tested and certified that the products contain the identity and quantity of dietary ingredients declared on the label and no unacceptable quantities of unwanted contaminants³. It names products, forms and serving sizes, and its Product ID column reads “All”^3–5.

What each phrase on a product page tells you, and where to check it
Phrase on a product page	What it tells you	Where to check
Third-party tested	A maker says an outside lab tested something. It doesn’t name the lab, the tests or the lots²	Ask the maker for the certificate of analysis for your lot
NSF Certified for Sport	The product is in NSF’s program for banned substances, label match, contaminants and facility¹	NSF’s Certified for Sport database, searched by brand and product
NSF/ANSI 173	The product is in NSF’s dietary supplement listing. We found no lot numbers or dates in the listings we read^3–5	info.nsf.org dietary supplement listings, searched by company
Informed Choice	A separate certifier. Its November 2026 list names products by brand, with no sizes, flavors or lots⁶	Informed Choice’s certified products list
A lot you can match	The lot number on your container appears in the certifier’s lot list for that product¹⁰	The “Lot #” field on the product’s NSF listing

Twelve products with lot numbers you can match

These listings name lots. Find the lot number printed on your container and look for it in the list. Counts below are what each page showed on November 6, 2026. NSF adds lots over time, so some reviews carry an earlier, lower count.

Klean Athlete’s three products each have two entries, and Nordic Naturals’ gummies have two codes. A given lot sits in one entry or the other, so search both. Klean Magnesium’s two entries share two lot numbers, so 22 lots are different^{26, 27}. Klean Omega’s first entry shows 19 numbers, two of them repeated, so 17 are different²⁸.

NSF Certified for Sport listings that name lots, checked November 6, 2026
Product	NSF listing name	Serving and package sizes	Lots listed	Worth knowing
Thorne Creatine	Thorne® Creatine¹⁰	1 scoop (5 g). 450 g and 900 g	70	One list covers both package sizes
Thorne Magnesium Bisglycinate	Thorne® Magnesium Bisglycinate¹¹	1 scoop (3.77 g). 7.98 oz (226.2 g)	21	Unflavored powder
Thorne Vitamin D-5,000	Thorne® D-5,000¹²	1 capsule. 60 and 120	44	One list covers the 60 and 120 bottles, so we can’t split the lots by size
Thorne Whey Protein Isolate	Thorne® Whey Protein Isolate Vanilla Flavored¹³	1 scoop (27.9 g). 29.7 g and 906 g	23	This entry is for the vanilla flavor, so match your flavor
Momentous Creatine	Creatine Monohydrate¹⁴	1 scoop (5 g). 450 g	28	A second Momentous entry covers 5 g to 450 g with lot “All”¹⁵
Klean Creatine	Klean Athlete® Klean Creatine and Klean Creatine^{24, 25}	5 g serving. 315 g	2 and 16	Two entries for the same 315 g powder
Klean Magnesium	Klean Magnesium, two entries^{26, 27}	1 capsule. 90	11 and 13	Two lots appear in both
Klean Omega	Klean Omega, two entries^{28, 29}	1 softgel. 60	17 and 6	Different lots in each entry
Nordic Naturals Ultimate Omega 2X Sport	Ultimate Omega 2X Sport (NUS-01807)³⁰	2 softgels. 60	11	An older, lemon-flavored entry lists 2 lots³¹
Nordic Naturals Vitamin D3 Gummies Sport	Vitamin D3 Gummies Sport (RUS-31142) and (SMP-00088)^{32, 33}	1 gummy. 120 for the first code, package size 1 for the second	4 and 5	The two codes list different lots
AG1 Next Gen	AG1® Next Gen³⁴	1 scoop or stick (13 g). 13, 39, 91 and 390 g	72	Also named in NSF’s dietary supplement listing and on Informed Choice’s list^{4, 6}
Transparent Labs Creatine HMB	Creatine HMB Unflavored³⁵	1 scoop or pack (7 g). 105, 210 and 420 g	14	Flavors are separate listings. Also on NSF’s dietary supplement list and Informed Choice’s list^{5, 6}

Momentous: listings that say “All” for lots

Most Momentous entries show lot “All”^16–20. NSF’s page names no lot to look up, so you can’t match your container’s number. Momentous says every batch is NSF Certified for Sport³⁸. That’s a statement about its program, and the listing alone can’t confirm it for your lot.

A listing for all lots tells you the product is in the program. A lot list lets you check your own container. The listings we read show no certification date^{16, 20}. NSF also lists Momentous Omega-3 twice with the same serving and package, and doesn’t say which matches the current label^{17, 18}.

Momentous NSF Certified for Sport listings with lot “All”, checked November 6, 2026
Product	NSF listing name	Serving and package sizes	Lot field
Momentous Magnesium Bisglycinate	Magnesium Bisglycinate¹⁶	2 capsules. 60	All
Momentous Omega-3	Momentous Omega-3, two entries^{17, 18}	2 softgels. 60-count	All, in both
Momentous Whey Protein Isolate	Essential Grass Fed-Whey Protein Chocolate¹⁹	1 scoop (26.2 g). 26.2 g, 262 g and 655 g	All
Momentous Daily Hydration	Daily Hydration in Grapefruit, Watermelon, Blood Orange and Lemonade, four entries^20–23	1 packet. 30-count packages	All, in each
Momentous Creatine	Creatine Monohydrate, second entry¹⁵	1 scoop (5 g). 5 g, 75 g, 150 g and 450 g	All

BulkSupplements Magnesium Glycinate: listed, with one lot

NSF’s Certified for Sport database lists BulkSupplements’ Magnesium Glycinate with a single lot number, 2500512, and a 1 kg package³⁶. The review covers the 500 g bag. Nothing on the listing says a lot from that bag is on the list, so whether your bag’s lot is covered is unknown.

The NSF dietary supplement listing names the same powder, at a 3/4 teaspoon serving. It shows “All” under Product ID and no lot numbers, package sizes or dates³. It can’t confirm the glycinate-plus-oxide formula the label declares. The same brand has other products with longer lot lists, such as unflavored creatine with five lots³⁷. The magnesium lists fewer lots than that creatine entry.

NSF’s brand list files BulkSupplements under three spellings, “Bulk Supplements”, “BULK SUPPLEMENTS” and “BulkSupplements.com”⁹. Searching one spelling can miss entries filed under another. For lot-level proof, ask BulkSupplements for the certificate of analysis for your lot. For a magnesium where you can match a lot, see best magnesium glycinate supplements.

Where NSF lists BulkSupplements Magnesium Glycinate, checked November 6, 2026
Record	What it shows	What it leaves open
NSF Certified for Sport³⁶	Magnesium Glycinate powder, 3/4 tsp (about 2.2 g) serving, package size 1 kg, one lot (2500512)	Whether lots of the 500 g bag are covered. No certification date
NSF dietary supplement listing, NSF/ANSI 173³	Magnesium Glycinate powder, 3/4 tsp (about 2.2 g) serving, made at a Henderson, Nevada facility. Product ID “All”	Lot numbers, package sizes, certification date and formula
Informed Choice, November 2026⁶	No BulkSupplements entry found	Nothing to check there

How to check one yourself

It takes a few minutes. The steps below work for any brand that names NSF Certified for Sport. If a step comes up empty, record what you searched and treat the result as unknown, not as a fail.

Find the lot number printed on your container and write it down.
Open NSF’s Certified for Sport product search at nsfsport.com and search the brand and the product name together. Brand names are filed in more than one spelling: Thorne appears as “Thorne” and “Thorne®”, and BulkSupplements under three spellings⁹.
Open the listing and match the product name, flavor, package size and serving size to your container. NSF may file a flavor under a different name than the maker uses, as it does for Momentous’s chocolate whey.
Read the “Lot #” field. If it lists numbers, yours should be among them¹⁰. If it says “All”, there’s no list to check and you’re relying on NSF and the maker¹⁶.
If your lot isn’t on the list, check the other entries for the same product, then ask the maker. A new lot may not be on the page yet.
For AG1 and Transparent Labs, also look the company up in NSF’s dietary supplement listing at info.nsf.org and on Informed Choice’s list^4–6.

Where a maker says more than the listing shows

Momentous says its Omega-3 is IFOS certified. We didn’t check IFOS’s own listing, so we count only the NSF entries³⁹. Nordic Naturals says its fish oils are third-party tested and that certificates of analysis are available for any product, but it doesn’t post one on the product page⁴⁰.

Transparent Labs says Informed Choice certifies Creatine HMB, and Informed Choice’s November 2026 list names Transparent Labs Creatine HMB, so the claim checks out. The list gives no sizes, flavors or lots^{6, 41}. Thorne says it tests each ingredient for identity, purity and potency, and the NSF mark shows on its pages⁴². The lot lists above are the part you can check yourself.

What a listing doesn’t show

It doesn’t show that a supplement works. NSF describes its program in terms of banned substances, label match, contaminants and facility audits, none of which is a benefit¹. For what trials found, read the supplements evidence review, Does creatine work? and Magnesium for sleep.

It doesn’t show that the dose suits you. Thorne’s D-5,000 is certified, and one capsule is 5,000 IU of vitamin D3, while NIH sets the adult tolerable upper intake level at 4,000 IU a day^{7, 12}. Klean Magnesium is certified at 120 mg a capsule, and its directions of 1 to 4 capsules a day reach 480 mg, above NIH’s 350 mg upper limit for magnesium from supplements and medications^{8, 26, 43}. Ask a clinician which dose fits you.

It doesn’t show when a lot was tested or what was found. The listings we read carry no certification date and no test results^{10, 16, 36}. A lot on the list means NSF put it there. It doesn’t say anything about the container in a warehouse today.

How we checked

We read the public listings for the 17 supplements we reviewed. We didn’t see any lab report, and the prices and reviews are covered on each product’s page.

Opened each NSF Certified for Sport listing the reviews cite on November 6, 2026, and counted the distinct lot numbers on the page. Several counts are higher than the reviews’ earlier counts, because NSF adds lots^{10, 12, 35}.
Opened NSF’s dietary supplement listings for BulkSupplements (Hard Eight Nutrition LLC), AG1 and Transparent Labs^3–5.
Searched Informed Choice’s November 2026 list for all seven brands. It names AG1 and Transparent Labs Creatine HMB. It has no entry for Thorne, Momentous, Klean Athlete, Nordic Naturals or BulkSupplements, though a brand may be filed under another name⁶.
Searched NSF’s Certified for Sport brand list for BulkSupplements under its three spellings, and opened the Magnesium Glycinate and unflavored creatine listings^{9, 36, 37}.
Didn’t check USP, IFOS, ConsumerLab or any certifier beyond those above.

Sources

What Our Mark Means NSF Certified for Sport · certifier
Questions and Answers on Dietary Supplements US Food and Drug Administration, 2026 · regulator
NSF/ANSI Standard 173 Dietary Supplements listing: Hard Eight Nutrition LLC (BulkSupplements.com) NSF · certifier
NSF/ANSI Standard 173 Dietary Supplements listing: AG1 EU Enterprise Ltd. NSF · certifier
NSF/ANSI Standard 173 Dietary Supplements listing: Transparent Labs NSF · certifier
Informed Choice Certified Products List (November 2026) Informed Choice, 2026 · certifier
Vitamin D: Fact Sheet for Health Professionals NIH Office of Dietary Supplements · regulator
Magnesium: Fact Sheet for Health Professionals NIH Office of Dietary Supplements · regulator
Certified Product Results: Bulk Supplements NSF Certified for Sport · certifier
Certified for Sport listing: Thorne Creatine NSF Certified for Sport · certifier
Certified for Sport listing: Thorne Magnesium Bisglycinate NSF Certified for Sport · certifier
Certified for Sport listing: Thorne D-5,000 NSF Certified for Sport · certifier
Certified for Sport listing: Thorne Whey Protein Isolate Vanilla Flavored NSF Certified for Sport · certifier
Certified for Sport listing: Creatine Monohydrate, 450 g (Momentous) NSF Certified for Sport · certifier
Certified for Sport listing: Creatine Monohydrate, all lots (Momentous) NSF Certified for Sport · certifier
Certified for Sport listing: Magnesium Bisglycinate (Momentous) NSF Certified for Sport · certifier
Momentous Omega-3 - Certified for Sport listing (id 1671910) NSF Certified for Sport · certifier
Momentous Omega-3 - Certified for Sport listing (id 1597386) NSF Certified for Sport · certifier
Certified for Sport listing: Essential Grass Fed-Whey Protein Chocolate (Momentous) NSF Certified for Sport · certifier
Certified for Sport listing: Daily Hydration, Grapefruit Flavor (Momentous) NSF Certified for Sport · certifier
Certified for Sport listing: Daily Hydration, Watermelon Flavor (Momentous) NSF Certified for Sport · certifier
Certified for Sport listing: Daily Hydration, Blood Orange Flavor (Momentous) NSF Certified for Sport · certifier
Certified for Sport listing: Daily Hydration, Lemonade Flavor (Momentous) NSF Certified for Sport · certifier
Certified for Sport listing: Klean Athlete Klean Creatine NSF Certified for Sport · certifier
Certified for Sport listing: Klean Creatine NSF Certified for Sport · certifier
Certified for Sport listing: Klean Magnesium (United States, unflavored) NSF Certified for Sport · certifier
Certified for Sport listing: Klean Magnesium (United States, flavor Other) NSF Certified for Sport · certifier
Certified for Sport listing: Klean Omega (United States, unflavored) NSF Certified for Sport · certifier
Certified for Sport listing: Klean Omega (United States, flavor Other) NSF Certified for Sport · certifier
Ultimate Omega 2X Sport (NUS-01807) - Certified for Sport listing NSF Certified for Sport · certifier
Ultimate Omega 2X Sport - Certified for Sport listing (older entry) NSF Certified for Sport · certifier
Vitamin D3 Gummies Sport (RUS-31142) - Certified for Sport listing NSF Certified for Sport · certifier
Vitamin D3 Gummies Sport (SMP-00088) - Certified for Sport listing NSF Certified for Sport · certifier
Certified for Sport listing: AG1 Next Gen NSF Certified for Sport · certifier
Certified for Sport listing: Creatine HMB Unflavored (Transparent Labs) NSF Certified for Sport · certifier
Certified for Sport listing: Magnesium Glycinate (Bulk Supplements) NSF Certified for Sport · certifier
Certified for Sport listing: Creatine Monohydrate Powder Unflavored (Bulk Supplements) NSF Certified for Sport · certifier
Magnesium Bisglycinate product page Momentous · manufacturer
Omega-3 Fish Oil Supplement (60 Capsules) product page Momentous · manufacturer
Ultimate Omega 2X Sport | NSF Certified | Nordic Naturals Nordic Naturals · manufacturer
Creatine HMB product page Transparent Labs · manufacturer
Creatine product page Thorne · manufacturer
Klean Magnesium product page Klean Athlete · manufacturer

How this was written. Written from the sources listed above, checked Nov 7, 2026. It is general information, not medical advice. Talk to a clinician before acting on anything here if you have a health condition or take medication.

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