Selection within collagen · data from
The best collagen from USA Fitness: 6 products by price per kg
The short answer. Of the 6 products that pass this filter, the highest scoring is QUAMTRAX COLLAGEN 300 GR NEUTRO from USA Fitness: €48.33/kg and verification level 1 out of 4. The selection runs from €48.33/kg to €177.57/kg, with a median of €73.00/kg.
The 6 collagen products sold by USA Fitness, scored with the same score as the rest of the site. Its median is €73.00/kg, 22 % above the median of the 16 stores compared (€60.06/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 COLLAGEN 300 GR NEUTRO
€48.33/kgNo third-party seal
€48.33 per kg: 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
6
products compared
from €48.33 to €177.57
per kg
0
at verified level 4
Filter and sort
| # | Product | Store | |||
|---|---|---|---|---|---|
| 01 | QUAMTRAX COLLAGEN 300 GR NEUTRO · 2/2 requirements | USA Fitness | €14.50 | €48.33 /kg | 62 |
QUAMTRAX COLLAGEN 300 GR · 1/2 requirements | USA Fitness | €15.90 | €53.00 /kg | 55 | |
| 02 | QUAMTRAX COLLAGEN PLUS PEPTAN 350 GR NEUTRO · 2/2 requirements | USA Fitness | €19.90 | €56.86 /kg | 59 |
| 03 | APPLIED NUTRITION COLLAGEN PEPTIDES 300 GR · 1/2 requirements | USA Fitness | €32.90 | €109.67 /kg | 48 |
| 04 | WEIDER SPORT COLLAGEN 300GR · 0/2 requirements | USA Fitness | €21.90 | €73.00 /kg | 46 |
| 05 | FERALIVE COLÁGENO BEAUTY 210 GRS · 0/2 requirements | USA Fitness | €37.29 | €177.57 /kg | 41 |
No product makes that cut
Out of the 6 in this table, none meets every filter that is currently set at the same time.
6 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 |
|---|---|---|
| Hydrolysed collagenEvidence-backed dose: from 10 g per serving | —6 of 6 contain it · none publishes the dose | 14.9 g162 of 162 contain it · 20 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 22 % more per kg than All other stores (€73.00/kg against €60.06/kg, medians of both catalogues). That difference does not come out of nowhere. These are the data that explain it, with each store’s figure alongside: pack size (median), different brands in the catalogue.
| 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. | €0.730 | €0.607 |
| Pack size (median)All other stores sells bigger packs, and a big pack spreads the same tub, the same label and the same shipping over more kilos. Part of the price gap per kg is this and not a discount: comparing one store’s small pack with the other’s large one inflates the gap. | 300 g | 334 g |
| Different brands in the catalogueUSA Fitness mostly sells one brand, QUAMTRAX: 50 % of its catalogue in this category. All other stores spreads its own across 74 brands. A store selling its own brand skips the manufacturer’s margin and can cut the price without touching the formula; a reseller pays that margin and passes it on, and in exchange carries brands the other does not sell. | 4 (50 % QUAMTRAX) | 74 (18 % Desconocida) |
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 collagen comparison: the only thing removed here is the products that do not meet the criterion above. How it is calculated.
Questions about this collagen selection
Answered with the data on this page
- Which is the best collagen in this selection?
- QUAMTRAX COLLAGEN 300 GR NEUTRO from USA Fitness, with 62 points out of 100 at €48.33/kg. The 6 collagen products sold by USA Fitness, scored with the same score as the rest of the site. Its median is €73.00/kg, 22 % above the median of the 16 stores compared (€60.06/kg).
- Which is the cheapest per kg?
- QUAMTRAX COLLAGEN 300 GR NEUTRO from USA Fitness, at €48.33/kg (300 g pack for €14.50). It is at verification level 1 out of 4: price is only 35 % of the mark.
- How was this selection made?
- The 6 collagen products sold by USA Fitness, scored with the same score as the rest of the site. Its median is €73.00/kg, 22 % above the median of the 16 stores compared (€60.06/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 collagen
Same dataset, another question