Amazon or USA Fitness for collagen: which is better value per kg

Amazon or USA Fitness for collagen?

On price per kg, Amazon: its median is €59.67/kg against €73.00/kg at USA Fitness, which is 22 % dearer. The median does not decide on its own: most of the rest of the mark is certification, and there Amazon has 0 products at level 4 and USA Fitness has 0.

Which is the cheapest collagen across the two stores?

Colágeno Hidrolizado en Polvo – 1,5 kg (1500 g) – Péptidos Tipo 1 y 3 from Amazon, at €26.63/kg (1500 g pack for €39.95), at verification level 1 out of 4.

Why don’t Amazon and USA Fitness cost the same?

USA Fitness costs 22 % more per kg than Amazon (€73.00/kg against €59.67/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). Price per kg and price per dose point to the same store, so the dose does not erase the label difference: Amazon is cheaper both ways. Amazon 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.

Which of the two stores scores better?

Colágeno Hidrolizado en Polvo – 1,5 kg (1500 g) – Péptidos Tipo 1 y 3 from Amazon, with 70 out of 100. The score is 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, and it is computed without looking at affiliate links. Prices from October 31, 2026.