Protein powder · 9 products
What protein powder really costs, and how much of its testing you can see.
Every price is converted to cost per 25 g of protein, using the protein grams on the label, not the scoop weight (a 32 g scoop might hold 24 g of protein or 18 g). Each product shows its protein source. Testing transparency, including published heavy-metal results, gets its own grade, A to C, and is never blended into the price.
| Product | Cost per 25 g protein | Best price | Tier | Testing |
|---|---|---|---|---|
NutricostWhey Protein Isolate | $1.74 | Vitacost$124.95 / 60 servingsChecked Oct 22, 2026 | C | No current certificationNo COA found |
Optimum NutritionGold Standard 100% Whey | $1.76 | Target$48.99 / 29 servingsChecked Oct 22, 2026 | C | No current certificationNo COA found |
NOW FoodsWhey Protein Isolate | $1.83 | Vitacost$126.03 / 69 servingsChecked Oct 22, 2026 | C | No current certificationNo COA found |
Garden of LifeSport Organic Plant-Based Protein | $1.84 | Vitacost$41.99 / 19 servingsChecked Oct 22, 2026 | C | No current certificationNo COA found |
| $1.84 | Target$30.99 / 20 servingsChecked Oct 22, 2026 | C | No current certificationNo COA found | |
| $1.88 | Vitacost$31.52 / 20 servingsChecked Oct 22, 2026 | C | No current certificationNo COA found | |
| $1.97 | Vitacost$44.99 / 19 servingsChecked Oct 22, 2026 | B | NSF Certified for SportNo COA found | |
ThorneWhey Protein Isolate | $2.58 | Vitacost$65.00 / 30 servingsChecked Oct 22, 2026 | B | NSF Certified for SportNo COA found |
Klean AthleteKlean Isolate | $3.72 | Klean Athlete shop$59.60 / 20 servingsChecked Oct 22, 2026 | C | No current certificationNo COA found |
No products match these filters.
What the tiers mean
- A
- A current third-party certification and a COA from an ISO/IEC 17025 accredited lab, testing the finished product, less than 2 years old.
- B
- Some proof of testing (a COA or a certification), but not everything Tier A needs.
- C
- No COA and no certification found.
Prices are read from each store's own page and marked stale after 14 days. A certification counts only if it appears on the certifier's own website. Star ratings are each store's own customer reviews, shown for reference; they never affect the order of the table.