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Amazon or PromoFarma for mass gainer: which is better value per kg
The short answer. For mass gainer, Amazon lists 40 products and PromoFarma another 13. By price per kg, Amazon’s median is €18.75/kg and PromoFarma’s is €26.00/kg. The highest scoring across both catalogues is MASmusculo Gainer Mass Formula from Amazon, with 70 out of 100 at €12.17/kg. The cheapest per kg is Scientiffic Nutrition Brutal Impact, Ganador de Peso y Masa Muscular, Mass Gainer con Carbohidratos, Proteina de Suero y Aminoácidos como la Creatina from Amazon, at €10.96/kg. Neither has products at verification level 4: for mass gainer 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
40 mass gainer products
€18.75/kgmedian
From €10.96/kg to €469.01/kg. 0 at verification level 4 and 0 at level 3.
Its best score: MASmusculo Gainer Mass Formula, 70/100 at €12.17/kg.
13 mass gainer products
€26.00/kgmedian
From €17.55/kg to €45.65/kg. 0 at verification level 4 and 0 at level 3.
Its best score: Soul Project Massive Whey Gainer Sabor Vainilla 2kg, 60/100 at €17.55/kg.
Amazon against PromoFarma, figure by figure
The same numbers for both
| Figure | Amazon | PromoFarma |
|---|---|---|
| Products compared | 40 | 13 |
| Median per kg | €18.75/kg | €26.00/kg |
| Cheapest per kg | €10.96/kg | €17.55/kg |
| Dearest per kg | €469.01/kg | €45.65/kg |
| Best score | 70 | 60 |
| Level 4 (certification backed by a third party) | 0 of 40 | 0 of 13 |
| Level 3 (the brand’s own lab report) | 0 of 40 | 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.
Why one is cheaper than the other
Factor by factor, with both stores’ data
PromoFarma costs 39 % more per kg than Amazon (€26.00/kg against €18.75/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).
| Factor | Amazon | PromoFarma |
|---|---|---|
| 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. | 2.3 kg | 1.5 kg |
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 53 products from both stores
Filter by store to see only one
Filter and sort
| # | Product | Store | |||
|---|---|---|---|---|---|
| 01 | Amazonfree delivery | €36.50 | €12.17 /kg | 70 | |
| 02 | Amazonfree delivery from €35 | €32.89 | €10.96 /kg | 69 | |
| 03 | Amazonfree delivery | €44.99 | €15.29 /kg | 65 | |
| 04 | Amazonfree delivery | €46.00 | €15.63 /kg | 65 | |
| 05 | Amazonfree delivery | €39.50 | €13.17 /kg | 65 | |
| 06 | Amazonfree delivery from €35 | €20.16 | €13.44 /kg | 64 | |
| 07 | Amazonfree delivery | €37.00 | €13.70 /kg | 64 | |
| 08 | Amazonfree delivery | €42.90 | €14.30 /kg | 63 | |
| 09 | Amazonfree delivery | €39.90 | €14.67 /kg | 63 | |
| Amazonfree delivery from €35 | €19.99 | €19.99 /kg | 58 | ||
| 10 | Amazonfree delivery | €37.99 | €15.20 /kg | 62 | |
| 11 | Amazonfree delivery | €37.99 | €15.20 /kg | 62 | |
| 12 | Amazonfree delivery | €72.99 | €15.37 /kg | 62 | |
| 13 | Amazonfree delivery | €39.99 | €16.00 /kg | 61 | |
| 14 | Amazonfree delivery from €35 | €17.08 | €17.08 /kg | 60 | |
| 15 | Amazonfree delivery | €43.99 | €17.60 /kg | 60 | |
| 16 | Amazonfree delivery | €43.99 | €17.60 /kg | 60 | |
| 17 | PromoFarma | €35.09 | €17.55 /kg | 60 | |
| PromoFarma | €52.00 | €26.00 /kg | 55 | ||
| 18 | Amazonfree delivery from €35 | €26.89 | €17.93 /kg | 59 | |
| 19 | Amazonfree delivery | €40.89 | €18.01 /kg | 59 | |
| 20 | Amazonfree delivery | €47.93 | €18.02 /kg | 59 | |
| 21 | Amazonfree delivery | €54.09 | €18.03 /kg | 59 | |
| 22 | Amazonfree delivery | €37.50 | €18.75 /kg | 59 | |
| 23 | Amazonfree delivery from €35 | €18.98 | €18.98 /kg | 59 | |
| 24 | PromoFarma | €18.68 | €21.98 /kg | 58 | |
| 25 | Amazonfree delivery | €39.90 | €19.95 /kg | 58 | |
| 26 | Amazonfree delivery | €59.99 | €20.00 /kg | 58 | |
| 27 | PromoFarma | €44.95 | €14.98 /kg | 57 | |
| 28 | Amazonfree delivery | €63.90 | €21.30 /kg | 57 | |
| 29 | Maxler Mega Gainer · 3 flavours | Amazonfree delivery from €35 | €21.39 | €21.39 /kg | 57 |
| 30 | Amazonfree delivery from €35 | €21.90 | €21.90 /kg | 57 | |
| 31 | Amazonfree delivery from €35 | €32.95 | €21.97 /kg | 57 | |
| 32 | PromoFarma | €24.10 | €21.91 /kg | 57 | |
| 33 | Amazonfree delivery from €35 | €29.50 | €24.58 /kg | 55 | |
| 34 | Amazonfree delivery from €35 | €24.99 | €24.99 /kg | 55 | |
| 35 | PromoFarma | €27.31 | €24.83 /kg | 55 | |
| 36 | Amazonfree delivery from €35 | €25.45 | €25.45 /kg | 55 | |
| 37 | PromoFarma | €38.81 | €25.87 /kg | 55 | |
| 38 | Amazonfree delivery from €35 | €34.90 | €26.44 /kg | 55 | |
| 39 | PromoFarma | €40.09 | €26.73 /kg | 55 | |
| 40 | Amazonfree delivery | €68.00 | €27.20 /kg | 54 | |
| 41 | Amazonfree delivery from €35 | €19.99 | €28.56 /kg | 54 | |
| 42 | PromoFarma | €27.62 | €36.83 /kg | 52 | |
| 43 | PromoFarma | €3.43 | €38.11 /kg | 52 | |
| 44 | PromoFarma | €75.65 | €42.03 /kg | 51 | |
| PromoFarma | €80.39 | €44.66 /kg | 51 | ||
| 45 | Amazonfree delivery | €42.90 | €42.90 /kg | 51 | |
| 46 | Eafit Wheygainer Vainilla 750 gpricey now | PromoFarma | €34.24 | €45.65 /kg | 50 |
| 47 | Amazonfree delivery from €35 | €15.99 | €190.36 /kg | 46 | |
| 48 | Amazonfree delivery from €35 | €15.99 | €197.41 /kg | 46 | |
| 49 | Amazonfree delivery | €37.99 | €452.26 /kg | 45 | |
| Amazonfree delivery | €37.99 | €469.01 /kg | 45 |
No product makes that cut
Out of the 53 in this table, none meets every filter that is currently set at the same time.
53 products in this table
Questions about Amazon and PromoFarma for mass gainer
Answered with the data on this page
- Amazon or PromoFarma for mass gainer?
- On price per kg, Amazon: its median is €18.75/kg against €26.00/kg at PromoFarma, which is 39 % 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 PromoFarma has 0.
- Which is the cheapest mass gainer across the two stores?
- Scientiffic Nutrition Brutal Impact, Ganador de Peso y Masa Muscular, Mass Gainer con Carbohidratos, Proteina de Suero y Aminoácidos como la Creatina from Amazon, at €10.96/kg (3000 g pack for €32.89), at verification level 1 out of 4.
- Why don’t Amazon and PromoFarma cost the same?
- PromoFarma costs 39 % more per kg than Amazon (€26.00/kg against €18.75/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). 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?
- MASmusculo Gainer Mass Formula 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 15, 2026.
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