Selection within vitamin c · data from
The best vitamin C from PromoFarma: 13 products by price per capsule
The short answer. Of the 13 products that pass this filter, the highest scoring is BioTechUSA Biotech Usa Vitamina C 1000Mg 100tabs from PromoFarma: €0.135/capsule and verification level 1 out of 4. The selection runs from €0.135/capsule to €0.505/capsule, with a median of €0.261/capsule.
The 13 vitamin C products sold by PromoFarma, scored with the same score as the rest of the site. Its median is €0.261/capsule, 67 % above the median of the 11 stores compared (€0.156/capsule).
† 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
BioTechUSA Biotech Usa Vitamina C 1000Mg 100tabs
€0.135/capsuleNo third-party seal
€0.135 per capsule: the cheapest of those that meet the category's requirements and are not underdosed.
Score 58 out of 100: the highest mark, with 35 % of the weight on price per capsule.
At PromoFarma · see how its score breaks down
The full selection
13
products compared
from €0.135 to €0.505
per capsule
0
at verified level 4
Filter and sort
| # | Product | Store | |||
|---|---|---|---|---|---|
| 01 | BioTechUSA Biotech Usa Vitamina C 1000Mg 100tabs · 1/1 requirements | PromoFarma | €13.49 | €0.135 /capsule | 58 |
| 02 | Relafit Vitamina C Forte 500 mg 30 caps · 1/1 requirements | PromoFarma | €5.99 | €0.200 /capsule | 54 |
| 03 | PromoFarma | €4.06 | €0.169 /capsule | 54 | |
| 04 | PromoFarma | €19.96 | €0.222 /capsule | 53 | |
| 05 | Now Vitamina C 1000mg 100caps · 1/1 requirements | PromoFarma | €26.69 | €0.267 /capsule | 52 |
| 06 | Biokygen Imunogood Vitamina C 60caps · 0/1 requirements | PromoFarma | €7.89 | €0.132 /capsule | 51 |
| 07 | PromoFarma | €17.29 | €0.288 /capsule | 50 | |
| 08 | PromoFarma | €30.30 | €0.505 /capsule | 50 | |
| 09 | SOLARAY Vitamina C + Echinacea 60 caps · 0/1 requirements | PromoFarma | €15.19 | €0.253 /capsule | 46 |
| 10 | GEN PROFESSIONAL Vitamina C 1000 + Vit E + Vit D3 60 caps · 0/1 requirements | PromoFarma | €15.66 | €0.261 /capsule | 46 |
| 11 | Vbyotics C-850 Vitamina Pureway 90 caps · 0/1 requirements | PromoFarma | €24.39 | €0.271 /capsule | 46 |
| 12 | PromoFarma | €17.48 | €0.291 /capsule | 45 | |
| 13 | Relafit Ms Propóleo Vitamina C 30caps · 0/1 requirements | PromoFarma | €11.46 | €0.382 /capsule | 44 |
No product makes that cut
Out of the 13 in this table, none meets every filter that is currently set at the same time.
13 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 | PromoFarma | All other stores |
|---|---|---|
| Vitamin CEvidence-backed dose: from 80 mg per serving | 1 g3 of 13 contain it · 3 reach the dose | 1 g25 of 114 contain it · 21 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
PromoFarma costs 84 % more per capsule than All other stores (€0.261/capsule against €0.142/capsule, 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: capsules per pack (median).
| Factor | PromoFarma | All other stores |
|---|---|---|
| Cost of one effective dosePrice per capsule 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. | €0.267 | €0.180 |
| Capsules per pack (median)All other stores sells bigger packs, and a big pack spreads the same tub, the same label and the same shipping over more capsules. Part of the price gap per capsule is this and not a discount: comparing one store’s small pack with the other’s large one inflates the gap. | 60 caps. | 100 caps. |
| Median rating at the storeBased on 5 reviews at PromoFarma and 2,680 at All other stores. These are the store’s own ratings, which is judge and party: they help spot a product that arrives damaged or tastes awful, not decide which formula is better. | 5/5 | 4.8/5 |
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 vitamin C comparison: the only thing removed here is the products that do not meet the criterion above. How it is calculated.
Questions about this vitamin C selection
Answered with the data on this page
- Which is the best vitamin C in this selection?
- BioTechUSA Biotech Usa Vitamina C 1000Mg 100tabs from PromoFarma, with 58 points out of 100 at €0.135/capsule. The 13 vitamin C products sold by PromoFarma, scored with the same score as the rest of the site. Its median is €0.261/capsule, 67 % above the median of the 11 stores compared (€0.156/capsule).
- Which is the cheapest per capsule?
- BioTechUSA Biotech Usa Vitamina C 1000Mg 100tabs from PromoFarma, at €0.135/capsule (100 capsules pack for €13.49). It is at verification level 1 out of 4: price is only 35 % of the mark.
- How was this selection made?
- The 13 vitamin C products sold by PromoFarma, scored with the same score as the rest of the site. Its median is €0.261/capsule, 67 % above the median of the 11 stores compared (€0.156/capsule). The order within the table is the usual score: 35 % price per capsule 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 vitamin C
Same dataset, another question