Cheapest Third-Party Tested Protein Powder (2026): Cost per 25 g

Every powder on every list

A tick means the list names that product, not just the brand. NSF Certified for Sport alone has more than 250 protein-powder listings from more than 40 brands (October 1, 2026). To look up any brand, use NSF’s own search.

Does the listing cover your flavor and tub size?

Not always. A brand on NSF’s list does not mean your flavor and tub are on it. For each powder, we read the NSF listing for the flavor we link: 9 listings. 6 match the tub we link. The other 3, for 2 powders, cover a different size, so we do not count them.

The 5.05 lb tub of Optimum Nutrition Gold Standard 100% Whey, the size we link, is on neither of ON’s NSF listings; they cover only the 10 lb tubs. If you are drug-tested and want ON, buy the 10.18 lb tub in Vanilla Ice Cream from ON’s own store and match its lot to that listing.

Momentous’s whey isolate is listed only in a 12-serving Strawberry pack, not the 25-serving tub we link.

What does each testing list check?

3 lists screen for drugs banned in sport. 2 check that the tub holds what the label says. They also test at different times: one tests every batch, the others test some batches or buy samples from shops. None of them is a heavy-metal ranking. For lead test results, see lead in protein powder.

Informed Choice lists a product line, not each flavor, size or lot. Its Dymatize entry names only “ISO100 Hydrolyzed Protein Powder (USA)”. You can check that the line is in the program, but you cannot match a lot number to it.

How do you check the tub in your hand?

Match the tub to the list yourself. A listing covers what the program tested, not every tub the brand sells.

1. Find the flavor, the size and the lot or batch number on your tub. The lot is usually printed near the date.
2. Open the program’s own list, not the brand’s website. Search the brand and product name.
3. On NSF Certified for Sport, check that the listing names your flavor and size. Then check that your lot is one of the certified lots. The tables above show how many lots each listing names.
4. On Informed Sport, every batch is tested before it is sold, so any tub of a listed product is covered.
5. On Informed Choice, check that the product name matches your tub.
6. If your tub is not on a list and you are drug-tested, contact the brand or buy a listed tub before you compete.

What if the label says “tested” but names no list?

Then you have nothing to check. A label that says “third-party tested” may be true, but only a named program lets you look the product up. Look for the program’s name on the tub, then find your product on that program’s own list.

How we checked

Dates. We searched the five lists for every powder between August 25, 2026 and September 22, 2026. NSF/ANSI 173 matches come from our August 25, 2026 copy of that list. We re-read each NSF Certified for Sport listing on October 1, 2026 for its flavor, sizes and lots. Informed Sport’s site could not be read on October 1, 2026, so its ticks come from our September copy of the list. Lists change; check yours before you buy or compete.

Close, but not counted. NSF Certified for Sport lists “Organic Plant-Based Performance Protein Vanilla” from Garden of Life (listing 1233901). The name differs from the Sport plant protein we link, and we could not open the brand’s site to confirm they are the same. Vega’s listing uses the product’s newer name, “Performance Protein + Recovery”; Vega says it was renamed from Sport Premium Protein. Transparent Labs has a second NSF listing for the same flavor in a 1,053 g size (listing 1756594). NSF also lists Momentous Essential Grass-Fed Whey Protein in chocolate and vanilla (listings 1410573, 1410568); that is a different product from the Whey Isolate we link. NSF lists Cellucor Whey Sport in chocolate and vanilla (listings 1597647, 1597648); we link C4 Whey, a different product, which is on no list.

Not checked. BSCG is not one of the five lists we search. A powder listed only by BSCG shows here as on no list.

Corrections. Changes are logged on our corrections log.

Questions people ask

Sources

1. NSF Certified for Sport (NSF): www.nsfsport.com. Program description checked September 22, 2026.
2. Informed Sport (LGC): sport.wetestyoutrust.com. Program description checked September 22, 2026.
3. Informed Choice (LGC): choice.wetestyoutrust.com. Program description checked September 22, 2026.
4. NSF/ANSI 173 (NSF): www.nsf.org. Program description checked September 22, 2026.
5. USP Verified (USP): www.quality-supplements.org. Program description checked September 22, 2026.
6. NSF Certified for Sport listing pages, read October 1, 2026: 1778885, 1545203, 1121764, 1513728, 1809884, 1708470, 1676856, 1256427, 1484223.
7. Listing screenshots captured October 1, 2026 from NSF Certified for Sport and Informed Choice.

What 25 g of protein costs in every tub: protein powder cost per 25 g. Two big names side by side: ON Gold Standard vs Dymatize ISO100. Which isolate to buy: best whey isolate protein powder. All protein guides: protein.