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Amazon or PromoFarma for casein: which is better value per kg
The short answer. For casein, Amazon lists 30 products and PromoFarma another 13. By price per kg, Amazon’s median is €41.40/kg and PromoFarma’s is €41.40/kg. The highest scoring across both catalogues is PBN Proteína de Caseína Micelar, Chocolate, 1kg from Amazon, with 68 out of 100 at €22.99/kg. Neither has products at verification level 4: for casein the ceiling today is a lab report published by the brand itself, and that is not a certification.
Both stores measured on the same criterion: price per kg and certification verification level. There is no overall winner because there isn’t one: one can win on price and the other on certification, and here you see both separately.
† 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.
Both stores at a glance
30 casein products
€41.40/kgmedian
From €22.99/kg to €56.61/kg. 0 at verification level 4 and 0 at level 3.
Its best score: PBN Proteína de Caseína Micelar, Chocolate, 1kg, 68/100 at €22.99/kg.
13 casein products
€41.40/kgmedian
From €31.98/kg to €68.09/kg. 0 at verification level 4 and 0 at level 3.
Its best score: Biotechusa Micellar Casein Sabor Chocolate 2270 g, 63/100 at €31.98/kg.
Amazon against PromoFarma, figure by figure
The same numbers for both
| Figure | Amazon | PromoFarma |
|---|---|---|
| Products compared | 30 | 13 |
| Median per kg | €41.40/kg | €41.40/kg |
| Cheapest per kg | €22.99/kg | €31.98/kg |
| Dearest per kg | €56.61/kg | €68.09/kg |
| Best score | 68 | 63 |
| Level 4 (certification backed by a third party) | 0 of 30 | 0 of 13 |
| Level 3 (the brand’s own lab report) | 0 of 30 | 0 of 13 |
The median is not the price you will pay. It is the midpoint of that store’s catalogue in this category, and it tells you whether a store is dear or cheap overall. For buying, the specific row in the table below is what counts.
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 | Amazon | PromoFarma |
|---|---|---|
| Casein proteinEvidence-backed dose: from 20 g per serving | 33.1 g30 of 30 contain it · 8 reach the dose | —13 of 13 contain it · none publishes 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
Both medians sit at €41.40/kg, so price does not break the tie: what changes between Amazon and PromoFarma is in the rows below.
| Factor | Amazon | PromoFarma |
|---|---|---|
| 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: PromoFarma is cheaper both ways. | €1.035 | €1.035 |
| Pack size (median)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. | 1 kg | 908 g |
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.
All 43 products from both stores
Filter by store to see only one
Filter and sort
| # | Product | Store | |||
|---|---|---|---|---|---|
| 01 | PBN Proteína de Caseína Micelar, Chocolate, 1kg · 2 flavours | Amazonfree delivery from €35 | €22.99 | €22.99 /kg≈ €28.74 /kg of protein | 68 |
| 02 | PromoFarma | €72.59 | €31.98 /kg≈ €39.98 /kg of protein | 63 | |
| 03 | PromoFarma | €32.50 | €32.50 /kg≈ €40.62 /kg of protein | 63 | |
ASN Premium Micellar Casein Vainilla 1000 g · 1/1 requirements | PromoFarma | €32.79 | €32.79 /kg≈ €40.99 /kg of protein | 63 | |
| 04 | Amazonfree delivery | €58.90 | €29.45 /kg≈ €36.81 /kg of protein | 62 | |
| 05 | Amazonfree delivery | €74.29 | €29.72 /kg≈ €37.15 /kg of protein | 62 | |
| Amazonfree delivery from €35 | €20.06 | €40.12 /kg≈ €50.15 /kg of protein | 57 | ||
| 06 | Amazonfree delivery from €35 | €30.70 | €30.70 /kg≈ €38.38 /kg of protein | 61 | |
| 07 | Amazonfree delivery | €59.99 | €32.96 /kg≈ €41.20 /kg of protein | 60 | |
| 08 | BioTechUSA Biotech Usa Micellar Casein Chocolate 908 g · 1/1 requirements | PromoFarma | €36.59 | €40.30 /kg≈ €50.37 /kg of protein | 59 |
| 09 | Scitec Nutrition 100% Casein Complex · 2 flavours | Amazonfree delivery | €84.90 | €36.13 /kg≈ €45.16 /kg of protein | 59 |
| 10 | Amazonfree delivery | €72.99 | €36.49 /kg≈ €45.61 /kg of protein | 58 | |
| 11 | Amazonfree delivery from €35 | €32.99 | €36.66 /kg≈ €45.82 /kg of protein | 58 | |
| 12 | Amazonfree delivery | €36.90 | €36.90 /kg≈ €46.12 /kg of protein | 58 | |
| 13 | Amazonfree delivery | €73.90 | €36.95 /kg≈ €46.19 /kg of protein | 58 | |
| 14 | Amazonfree delivery | €38.90 | €38.90 /kg≈ €48.62 /kg of protein | 58 | |
| 15 | Amazonfree delivery | €38.90 | €38.90 /kg≈ €48.62 /kg of protein | 58 | |
| 16 | Amazonfree delivery | €39.00 | €39.00 /kg≈ €48.75 /kg of protein | 58 | |
| 17 | Amazonfree delivery | €35.90 | €39.54 /kg≈ €49.42 /kg of protein | 57 | |
| 18 | Amazonfree delivery | €41.40 | €41.40 /kg≈ €51.75 /kg of protein | 57 | |
| 19 | Amazonfree delivery | €74.99 | €41.66 /kg≈ €52.07 /kg of protein | 57 | |
| 20 | Amazonfree delivery from €35 | €20.90 | €41.80 /kg≈ €52.25 /kg of protein | 57 | |
| 21 | Amazonfree delivery | €42.50 | €42.50 /kg≈ €53.12 /kg of protein | 56 | |
| 22 | Amazonfree delivery | €77.95 | €42.83 /kg≈ €53.54 /kg of protein | 56 | |
| Amazonfree delivery | €42.99 | €46.53 /kg≈ €58.16 /kg of protein | 55 | ||
| 23 | Amazonfree delivery | €38.95 | €43.28 /kg≈ €54.10 /kg of protein | 56 | |
| 24 | Amazonfree delivery | €45.95 | €45.95 /kg≈ €57.44 /kg of protein | 55 | |
| 25 | PromoFarma | €46.19 | €46.19 /kg≈ €57.74 /kg of protein | 55 | |
| 26 | Amazonfree delivery | €44.90 | €49.34 /kg≈ €61.68 /kg of protein | 54 | |
| 27 | Amazonfree delivery from €35 | €24.90 | €49.80 /kg≈ €62.25 /kg of protein | 54 | |
| 28 | Amazonfree delivery from €35 | €24.99 | €49.98 /kg≈ €62.47 /kg of protein | 54 | |
| 29 | PromoFarma | €38.32 | €51.09 /kg≈ €63.86 /kg of protein | 54 | |
| 30 | Amazonfree delivery | €51.99 | €51.99 /kg≈ €64.99 /kg of protein | 54 | |
| 31 | PWD Casein Protein Meal Brownie 450 g · 2 flavours | PromoFarma | €23.79 | €52.87 /kg≈ €66.09 /kg of protein | 54 |
PWD Casein Protein Meal Queso Fresa 450 g · 0/1 requirements | PromoFarma | €24.29 | €53.98 /kg≈ €67.47 /kg of protein | 49 | |
| 32 | Caseína micelar aislada 1 kg natural · 3 flavours | Amazonfree delivery | €53.57 | €53.57 /kg≈ €66.96 /kg of protein | 54 |
| 33 | PromoFarma | €40.24 | €53.65 /kg≈ €67.06 /kg of protein | 54 | |
| 34 | Amazonfree delivery from €35 | €27.90 | €55.80 /kg≈ €69.75 /kg of protein | 53 | |
| 35 | Amazonfree delivery | €51.40 | €56.61 /kg≈ €70.76 /kg of protein | 53 | |
| 36 | PromoFarma | €61.14 | €40.76 /kg≈ €50.95 /kg of protein | 53 | |
| 37 | Biotech Nutricosmetics World Biotech Usa Casein Zero Vainilla 908 g · 0/1 requirements | PromoFarma | €37.50 | €41.30 /kg≈ €51.62 /kg of protein | 52 |
Biotech Nutricosmetics World Biotech Usa Casein Zero Chocolate 908 g · 0/1 requirements | PromoFarma | €37.59 | €41.40 /kg≈ €51.75 /kg of protein | 52 | |
| 38 | PromoFarma | €122.56 | €68.09 /kg≈ €85.11 /kg of protein | 51 |
No product makes that cut
Out of the 43 in this table, none meets every filter that is currently set at the same time.
43 products in this table
Questions about Amazon and PromoFarma for casein
Answered with the data on this page
- Amazon or PromoFarma for casein?
- On price per kg, PromoFarma: its median is €41.40/kg against €41.40/kg at Amazon. 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 PromoFarma has 0.
- Which is the cheapest casein across the two stores?
- PBN Proteína de Caseína Micelar, Chocolate, 1kg from Amazon, at €22.99/kg (1000 g pack for €22.99), at verification level 1 out of 4.
- Why don’t Amazon and PromoFarma cost the same?
- Both medians sit at €41.40/kg, so price does not break the tie: what changes between Amazon and PromoFarma is in the rows below. Price per kg and price per dose point to the same store, so the dose does not erase the label difference: PromoFarma 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?
- PBN Proteína de Caseína Micelar, Chocolate, 1kg from Amazon, with 68 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 15, 2026.
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