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Amazon or USA Fitness: which is cheaper across 9 categories
Amazon90USA Fitnessacross 9 categories both of them sell
The short answer. Of the 9 categories both sell, Amazon has the lower median in 9 and USA Fitness in 0. Across the whole catalogue, Amazon sits 6 % below the market median and USA Fitness 24 % above.
No store is cheap at everything. This page does not name a winner: it gives each one’s median in every category they share, so you can see where each wins and by how much. Prices are from the last collection and change; catalogue and certification change far less.
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Category by category
Each store’s median, in its unit
| Category | Amazon | USA Fitness | Difference |
|---|---|---|---|
| BCAA52 products from Amazon and 7 from USA Fitness. | €65.73/kg+10 % vs market | €68.81/kg+15 % vs market | 5 %cheaper: Amazon |
| Casein30 products from Amazon and 9 from USA Fitness. | €41.40/kg+2 % vs market | €53.28/kg+31 % vs market | 29 %cheaper: Amazon |
| Collagen65 products from Amazon and 6 from USA Fitness. | €59.67/kg-1 % vs market | €73.00/kg+22 % vs market | 22 %cheaper: Amazon |
| Creatine83 products from Amazon and 17 from USA Fitness. See the full head to head. | €39.90/kg-33 % vs market | €87.78/kg+47 % vs market | 120 %cheaper: Amazon |
| Essential amino acids (EAA)28 products from Amazon and 4 from USA Fitness. | €65.77/kg-6 % vs market | €86.92/kg+24 % vs market | 32 %cheaper: Amazon |
| Weight gainers40 products from Amazon and 5 from USA Fitness. | €18.75/kg-1 % vs market | €19.87/kg+5 % vs market | 6 %cheaper: Amazon |
| Glutamine51 products from Amazon and 7 from USA Fitness. | €58.17/kg-2 % vs market | €62.25/kg+5 % vs market | 7 %cheaper: Amazon |
| Magnesium80 products from Amazon and 7 from USA Fitness. | €0.110/capsule-9 % vs market | €0.182/capsule+50 % vs market | 65 %cheaper: Amazon |
| Omega 361 products from Amazon and 5 from USA Fitness. | €0.200/capsule-12 % vs market | €0.298/capsule+31 % vs market | 49 %cheaper: Amazon |
The median is not the price you will pay. It is the midpoint of that store’s catalogue in that category: it tells you where to start looking, not what to buy. That is what each category table is for, where the specific row counts.
Both stores, figure by figure
What is not today’s price
| Figure | Amazon | USA Fitness |
|---|---|---|
| Price indexMedian distance from the market median in the categories where it has three products or more. Negative is cheap. | -6 % | +24 % |
| Categories comparedAcross the whole site, in how many it has enough catalogue to be measured. | 30 | 9 |
| Products comparedThe ones this site collects from that store, not its whole catalogue. | 1600 | 70 |
| Brands in the catalogueA single brand means own brand (no manufacturer margin); many means reselling. | 466 | 28 |
| With lab reportLevel 3 or 4: testing a batch costs money and is passed on in the price. | 3 of 1600 | 1 of 70 |
| Product pages declaring additivesAn additive takes up grams that are not active ingredient and is cheaper than it. | 0 % | 0 % |
Questions about Amazon and USA Fitness
Answered with the data on this page
- Amazon or USA Fitness?
- Of the 9 categories both sell, Amazon has the lower median in 9 and USA Fitness in 0. Across the whole catalogue, Amazon sits 6 % below the market median and USA Fitness 24 % above. Price is not everything: Amazon publishes lab reports on 3 products and USA Fitness on 1.
- In which categories does each one win?
- Amazon is cheaper in bcaa, casein, collagen, creatine, essential amino acids (eaa), weight gainers, glutamine, magnesium, omega 3. USA Fitness is cheaper in none. These are medians of each catalogue in each category’s unit, with prices from October 15, 2026.
- Which catalogue is bigger?
- Amazon has 1600 products compared here across 30 categories and USA Fitness 70 across 12. Amazon spreads its catalogue across 466 brands and USA Fitness across 28: a store selling its own brand skips the manufacturer’s margin, a reseller pays it and in exchange carries brands the other does not.
Keep comparing
The same stores, by category