Selection within casein · data from
The best casein from USA Fitness: 9 products by price per kg
The short answer. Of the 9 products that pass this filter, the highest scoring is QUAMTRAX MICELLAR CASEIN 2.2 KG from USA Fitness: €34.05/kg and verification level 1 out of 4. The selection runs from €34.05/kg to €60.94/kg, with a median of €53.28/kg.
The 9 casein products sold by USA Fitness, scored with the same score as the rest of the site. Its median is €53.28/kg, 31 % above the median of the 16 stores compared (€40.76/kg).
† Some links are affiliate links — they do not change the ranking
Some store links are affiliate links: if you buy through them, this site may earn a commission at no extra cost to you. It changes nothing in the ranking: the score is computed beforehand and without reading those links, and products with no affiliate programme appear exactly the same. How it is calculated.
The three that stand out
QUAMTRAX MICELLAR CASEIN 2.2 KG
€34.05/kgNo third-party seal
€42.56 per kg of protein: the cheapest of those that meet the category's requirements and are not underdosed.
Score 62 out of 100: the highest mark, with 35 % of the weight on price per kg.
At USA Fitness · see how its score breaks down
The full selection
9
products compared
from €34.05 to €60.94
per kg
0
at verified level 4
Filter and sort
| # | Product | Store | |||
|---|---|---|---|---|---|
| 01 | QUAMTRAX MICELLAR CASEIN 2.2 KG · 1/1 requirements | USA Fitness | €74.90 | €34.05 /kg≈ €42.56 /kg of protein | 62 |
QUAMTRAX MICELLAR CASEIN 907 GR · 1/1 requirements | USA Fitness | €36.90 | €40.68 /kg≈ €50.85 /kg of protein | 59 | |
| 02 | USA Fitness | €37.90 | €37.90 /kg≈ €47.37 /kg of protein | 60 | |
| 03 | QNT CASEIN PROTEIN 908 GR · 1/1 requirements | USA Fitness | €38.50 | €42.40 /kg≈ €53.00 /kg of protein | 59 |
| 04 | AMIX MICELLAR CASEIN 1KG · 1/1 requirements | USA Fitness | €54.50 | €54.50 /kg≈ €68.12 /kg of protein | 56 |
| 05 | Optimum Nutrition 100% CASEIN 908 GR · 1/1 requirements | USA Fitness | €54.90 | €60.46 /kg≈ €75.58 /kg of protein | 55 |
Optimum Nutrition 100 % CASEIN 1.8 KG · 0/1 requirements | USA Fitness | €95.90 | €53.28 /kg≈ €66.60 /kg of protein | 49 | |
| 06 | QUAMTRAX DIRECT CASEIN 500 GR · 0/1 requirements | USA Fitness | €29.90 | €59.80 /kg≈ €74.75 /kg of protein | 48 |
| 07 | AMIX PRO MICELLE HD CASEIN 1600GR · 0/1 requirements | USA Fitness | €97.50 | €60.94 /kg≈ €76.17 /kg of protein | 48 |
No product makes that cut
Out of the 9 in this table, none meets every filter that is currently set at the same time.
9 products in this table
What each tub contains
Median dose per serving
Price per kilo does not tell you how much active ingredient is inside the kilo. This table does: for each ingredient, the median dose per serving at each store and how many products reach the dose backed by studies (the same reference this site scores with).
| Ingredient | USA Fitness | All other stores |
|---|---|---|
| Casein proteinEvidence-backed dose: from 20 g per serving | —9 of 9 contain it · none publishes the dose | 29.9 g75 of 75 contain it · 19 reach the dose |
The dose is per serving, not per tub. A big tub with a short dose forces you to take two scoops to get the same, and then it lasts half as long: that is why the price per dose in the next section does not match the price per kilo.
Why one is cheaper than the other
Factor by factor, with both stores’ data
USA Fitness costs 33 % more per kg than All other stores (€53.28/kg against €40.12/kg, medians of both catalogues). Going by what both pages declare, there are no differences in composition or pack size that explain it: here the gap is the store’s pricing policy.
| Factor | USA Fitness | All other stores |
|---|---|---|
| Cost of one effective dosePrice per kg and price per dose point to the same store, so the dose does not erase the label difference: All other stores is cheaper both ways. | €1.332 | €1.019 |
None of these factors is an accusation. They are medians of what each store publishes on its pages on the day prices were collected: where a page does not declare a figure, that store does not count in that row instead of counting as a zero. A specific product can contradict its store’s median, and that is what the full table is for. How all of this is calculated.
This is a filter, not another ranking. The score that sorts this table is exactly the same as in the full casein comparison: the only thing removed here is the products that do not meet the criterion above. How it is calculated.
Questions about this casein selection
Answered with the data on this page
- Which is the best casein in this selection?
- QUAMTRAX MICELLAR CASEIN 2.2 KG from USA Fitness, with 62 points out of 100 at €34.05/kg. The 9 casein products sold by USA Fitness, scored with the same score as the rest of the site. Its median is €53.28/kg, 31 % above the median of the 16 stores compared (€40.76/kg).
- Which is the cheapest per kg?
- QUAMTRAX MICELLAR CASEIN 2.2 KG from USA Fitness, at €34.05/kg (2200 g pack for €74.90). It is at verification level 1 out of 4: price is only 35 % of the mark.
- How was this selection made?
- The 9 casein products sold by USA Fitness, scored with the same score as the rest of the site. Its median is €53.28/kg, 31 % above the median of the 16 stores compared (€40.76/kg). The order within the table is the usual score: 35 % price per kg against the cheapest in the category, 35 % verifiable quality (certification, purity and additives), 20 % the category's own requirements and 10 % the buyers' rating at the store. Affiliate links do not enter the calculation. Prices collected on October 15, 2026.
Other ways to look at casein
Same dataset, another question