Why don’t Amazon and PromoFarma cost the same?

PromoFarma costs 122 % more per capsule than Amazon (€0.233/capsule against €0.105/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). Amazon 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.

Which of the two stores scores better?

Vitamina D3-4000 UI – Alta Concentración – Cura de 6 Meses | Defensas - Inmunidad y Salud Ósea - 365 Comprimidos - Bienestar Diario Para Todo El Año Con Vitaminas y Minerales - Vitavea from Amazon, with 82 out of 100. The score is 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, and it is computed without looking at affiliate links. Prices from October 15, 2026.

Home / Vitamin D / Amazon vs PromoFarma

Head to head · data from October 15, 2026

Amazon or PromoFarma for vitamin D: which is better value per capsule

The short answer. For vitamin D, Amazon lists 71 products and PromoFarma another 15. By price per capsule, Amazon’s median is €0.105/capsule and PromoFarma’s is €0.233/capsule. The highest scoring across both catalogues is Vitamina D3-4000 UI – Alta Concentración – Cura de 6 Meses | Defensas - Inmunidad y Salud Ósea - 365 Comprimidos - Bienestar Diario Para Todo El Año Con Vitaminas y Minerales - Vitavea from Amazon, with 82 out of 100 at €0.022/capsule. Neither has products at verification level 4: for vitamin D 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 capsule 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

Amazon

71 vitamin D products

€0.105/capsulemedian

From €0.022/capsule to €0.398/capsule. 0 at verification level 4 and 0 at level 3.

Its best score: Vitamina D3-4000 UI – Alta Concentración – Cura de 6 Meses | Defensas - Inmunidad y Salud Ósea - 365 Comprimidos - Bienestar Diario Para Todo El Año Con Vitaminas y Minerales - Vitavea, 82/100 at €0.022/capsule.

PromoFarma

15 vitamin D products

€0.233/capsulemedian

From €0.053/capsule to €0.446/capsule. 0 at verification level 4 and 0 at level 3.

Its best score: Hivital Foods Hivital Vitamina D3 4000 UI 300 perlas, 63/100 at €0.053/capsule.

Amazon against PromoFarma, figure by figure

The same numbers for both

Amazon and PromoFarma for vitamin D, with prices from October 15, 2026
Figure	Amazon	PromoFarma
Products compared	71	15
Median per capsule	€0.105/capsule	€0.233/capsule
Cheapest per capsule	€0.022/capsule	€0.053/capsule
Dearest per capsule	€0.398/capsule	€0.446/capsule
Best score	82	63
Level 4 (certification backed by a third party)	0 of 71	0 of 15
Level 3 (the brand’s own lab report)	0 of 71	0 of 15

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 122 % more per capsule than Amazon (€0.233/capsule against €0.105/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).

Where the price difference between Amazon and PromoFarma for vitamin D comes from
Factor	Amazon	PromoFarma
Capsules per pack (median)Amazon 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.	150 caps.	60 caps.

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 86 products from both stores

Filter by store to see only one

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Products sorted by score (recommended)
#	Product	Store
01	Vitamina D3-4000 UI · 365 comprimidosBest value	Amazonfree delivery from €35	€8.18	€0.022 /capsule€0.006 /1,000 IU	82
02	Vitamina D3 4000 UI Alto contenido · 400 comprimidos	Amazonfree delivery from €35	€9.99	€0.025 /capsule€0.006 /1,000 IU	78
03	Vitamina D3 4000 UI · 365 comprimidos	Amazonfree delivery from €35	€10.90	€0.030 /capsule€0.007 /1,000 IU	73
04	Nutravita Vitamina D3 4000 UI con 400 Comprimidos Softgel de Alta Dosis	Amazonfree delivery from €35	€14.99	€0.037 /capsule€0.009 /1,000 IU	67
05	Vitamina D3 4000 UI - 400 Comprimidos (Suministro para +1 Año)	Amazonfree delivery from €35	€14.99	€0.037 /capsule€0.009 /1,000 IU	67
06	Vitamina D3 4000UI, 400 Comprimidos, +1 año de Suministro	Amazonfree delivery from €35	€15.15	€0.038 /capsule€0.009 /1,000 IU	67
07	Bandini Bandini® Vitamina D 60.000 UI/mes 200 comprimidos (+6 Meses)	Amazonfree delivery from €35	€6.55	€0.033 /capsule	64
08	Vitamina D3 4000 UI · 365 cápsulas	Amazonfree delivery from €35	€16.97	€0.046 /capsule€0.012 /1,000 IU	63
09	Hivital Foods Hivital Vitamina D3 4000 UI 300 perlas4.7 (11) · 2/2 requirements	PromoFarma	€15.89	€0.053 /capsule€0.013 /1,000 IU	63
10	Vitamina D3 2000 UI Alta Potencia · 400 comprimidos	Amazonfree delivery from €35	€9.49	€0.024 /capsule€0.012 /1,000 IU	63
11	Vitamina D3 2000 UI · 365 tabletas	Amazonfree delivery from €35	€8.99	€0.025 /capsule€0.012 /1,000 IU	62
12	Vitamina D3 4000 UI · 500 comprimidos	Amazonfree delivery from €35	€24.97	€0.050 /capsule€0.013 /1,000 IU	62
13	vit4ever Vitamina D3 2000 UI - 365 Comprimidos - 50 µg de Colecalciferol	Amazonfree delivery from €35	€10.18	€0.028 /capsule€0.014 /1,000 IU	61
14	Vitamina D3 [ 4000 UI ] · 365 cápsulas	Amazonfree delivery from €35	€20.79	€0.057 /capsule€0.014 /1,000 IU	60
15	Vitamina D3 2000UI · 400 tabletas	Amazonfree delivery from €35	€11.99	€0.030 /capsule€0.015 /1,000 IU	60
16	Vitamina D3 4000 UI. 300 perlas para 10 meses de tratamiento.	Amazonfree delivery from €35	€17.87	€0.060 /capsule€0.015 /1,000 IU	60
17	Vitamina D3 y K2 MK7 4000 UI · 270 cápsulas	Amazonfree delivery from €35	€16.11	€0.060 /capsule€0.015 /1,000 IU	60
18	Vitamina D · 365 Cápsulas de vitamina D3 K2	Amazonfree delivery from €35	€21.99	€0.060 /capsule€0.015 /1,000 IU	60
19	Vitamina D3 4000 UI de HSN · 120 perlas	Amazonfree delivery from €35	€7.90	€0.066 /capsule€0.017 /1,000 IU	58
20	Vitamina D · 150 Cápsulas de vitamina D3 K2	Amazonfree delivery from €35	€9.98	€0.067 /capsule€0.017 /1,000 IU	58
21	Bandini Bandini® Vitamina D3 K2 365 Comprimidos 30000 UI al mes	Amazonfree delivery from €35	€17.90	€0.049 /capsule	58
22	Bandini Bandini® Vitamina D3 Natural 365 Cápsulas Blandas Suministro de	Amazonfree delivery from €35	€19.90	€0.055 /capsule	57
23	Vbyotics Vitamina D3 4000Ui 180 caps · 2/2 requirements	PromoFarma	€18.19	€0.101 /capsule€0.025 /1,000 IU	56
24	Vitamina D · 365 Cápsulas de vitamina D3 K2	Amazonfree delivery from €35	€21.51	€0.059 /capsule€0.012 /1,000 IU	56
25	Vitamina D3 y K2 2000 UI + 200 µg · 365 comprimidos	Amazonfree delivery from €35	€15.99	€0.044 /capsule€0.022 /1,000 IU	55
26	Vitamina D3 1000 UI · 365 tabletas	Amazonfree delivery from €35	€8.39	€0.023 /capsule€0.023 /1,000 IU	55
27	HSN Vitamina D3 5000 UI · 120 perlas	Amazonfree delivery from €35	€7.90	€0.066 /capsule€0.013 /1,000 IU	55
28	PLAMECA Vitamina D3 4000 UI Defensas · 90 cápsulas	Amazonfree delivery from €35	€8.90	€0.099 /capsule€0.025 /1,000 IU	54
29	Vitamina D3 2000 UI · 365 cápsulas	Amazonfree delivery from €35	€19.75	€0.054 /capsule€0.027 /1,000 IU	54
30	ESN Vitamina D3, 120 cápsulas	Amazonfree delivery from €35	€9.90	€0.083 /capsule	53
31	Vitamina D3 + K2 4000 UI + 100 µg MK-7 · 150 cápsulas	Amazonfree delivery from €35	€17.97	€0.120 /capsule€0.030 /1,000 IU	53
32	Vitamina D3 y K2 · 240 comprimidos	Amazonfree delivery from €35	€15.19	€0.063 /capsule€0.032 /1,000 IU	53
33	Supradyn Expert Vitamina D3 2000 UI, 365 Comprimidos	Amazonfree delivery from €35	€22.96	€0.063 /capsule€0.032 /1,000 IU	53
34	Vitamina D3 4000UI Drasanvi en 90 Comprimidos Diarios Vegano	Amazonfree delivery from €35	€11.90	€0.132 /capsule€0.033 /1,000 IU	52
35	Healthy Origins Healthy Origins · 360 cápsulas	Amazonfree delivery from €35	€34.74	€0.097 /capsule€0.010 /1,000 IU	52
36	HSN Vitamina D3 Vegana 4000 IU · 120 cápsulas	Amazonfree delivery from €35	€16.90	€0.141 /capsule€0.035 /1,000 IU	52
37	Essentialis Vitamina D3+K2 4000UI y K2 100mcg, 60 comprimidos	Amazonfree delivery from €35	€8.59	€0.143 /capsule€0.036 /1,000 IU	52
38	Vitamina D3 y K2 (5000 UI Vitamina D3 + · 180 comprimidos	Amazonfree delivery from €35	€18.97	€0.105 /capsule€0.021 /1,000 IU	52
39	Vitamina D3 y K2 Alta Dosis 5000 UI – 180 Cápsulas	Amazonfree delivery from €35	€19.99	€0.111 /capsule€0.022 /1,000 IU	52
40	Nutravita Vitamina D3 1000 UI · 365 cápsulas	Amazonfree delivery from €35	€14.99	€0.041 /capsule€0.041 /1,000 IU	51
41	MoriVeda Vitamina D3 + K2 MK7 vegana con 7000 UI de D3 y · 90 cápsulas	Amazonfree delivery from €35	€10.49	€0.117 /capsule	51
42	Vitamina D3 4000 UI & K2 200mcg MK-7, 120 Cápsulas - Wellium	Amazonfree delivery from €35	€19.90	€0.166 /capsule€0.042 /1,000 IU	51
43	Natysal Vitamina D3 4000 UI 30 caps · 2/2 requirements	PromoFarma	€8.99	€0.300 /capsule€0.075 /1,000 IU	51
44	Vitamina D3 y K2 Alta Dosis 5000 UI – 120 Cápsulas Veganas	Amazonfree delivery from €35	€14.99	€0.125 /capsule€0.025 /1,000 IU	51
45	vit4ever Vitamina D3 10.000 UI + Vitamina K2 200 µg · 180 comprimidos	Amazonfree delivery from €35	€22.99	€0.128 /capsule€0.013 /1,000 IU	51
46	INME VITAMINA D3 4000 UI 120 CAPSULAS	Amazonfree delivery from €35	€21.90	€0.182 /capsule€0.046 /1,000 IU	51
47	Bamboo Labs Vitamina D3 y K2 + Vitamina C · 120 cápsulas	Amazonfree delivery from €35	€21.95	€0.183 /capsule€0.046 /1,000 IU	51
48	Now Foods VITAMIN D3 5000 IU · 120 cápsulas	Amazonfree delivery from €35	€16.10	€0.134 /capsule€0.027 /1,000 IU	51
49	Vitamina D3 y K2. Vitamina D3 5000 ui + Vitamina K2 MK7 200 μg	Amazonfree delivery from €35	€20.95	€0.140 /capsule€0.028 /1,000 IU	51
50	Nutricost Vitamina K2 (MK7) (100 mcg) + Vitamina D3 (5000 UI) 120	Amazonfree delivery from €35	€16.95	€0.141 /capsule€0.028 /1,000 IU	51
51	Vitamina D3 + K2 en dosis altas · 200 comprimidos	Amazonfree delivery from €35	€19.99	€0.100 /capsule€0.050 /1,000 IU	50
52	Solgar Vitamina D3 (Colecalciferol) 15 µg · 60 cápsulas	Amazonfree delivery from €35	€8.51	€0.142 /capsule	50
53	Vitamina D3 2000 UI + K2 MK-7 150 µg · 200 cápsulas	Amazonfree delivery from €35	€20.97	€0.105 /capsule€0.052 /1,000 IU	50
54	YNSADIET Vitamina D3, Vitamina K2 - Silicio Orgánico - 90 Cápsulas	Amazonfree delivery from €35	€14.00	€0.156 /capsule	50
55	Vitamina D3 y K2 con Aceite de Oliva Virgen · 180 cápsulas	Amazonfree delivery from €35	€20.79	€0.115 /capsule€0.058 /1,000 IU	50
56	Life Pro Vitamina D3 + K2 MK7 90 Capsulas	Amazonfree delivery from €35	€14.72	€0.164 /capsule	50
57	Lamberts Vitamina D3 4000 UI (100 µg) · 120 cápsulas	Amazonfree delivery from €35	€28.12	€0.234 /capsule€0.059 /1,000 IU	50
58	HSN Vitamina D3 Liposomada Vegetariana (lanolina) · 120 cápsulas	Amazonfree delivery from €35	€14.49	€0.121 /capsule€0.060 /1,000 IU	50
59	EPAPLUS Nutrabits Vitamina D3 + K2 para Huesos y Defensas, 90 Cápsulas	Amazonfree delivery from €35	€15.87	€0.176 /capsule	50
60	Solgar Vitamina D3 4000 UI (100 µg) · 120 cápsulas	Amazonfree delivery from €35	€31.69	€0.264 /capsule€0.066 /1,000 IU	50
61	Lamberts Vitamina D3 2000 Ui+K2 90 mcg 90 caps5.0 (1) · 2/2 requirements	PromoFarma	€33.70	€0.374 /capsule€0.187 /1,000 IU	50
62	Solgar Vitamina D3 4000 UI, Aroma Vainilla, 60 Unidades (Paquete de 1)	Amazonfree delivery from €35	€16.19	€0.270 /capsule€0.068 /1,000 IU	49
63	fairvital Vitamina D3 + K2 · 90 cápsulas	Amazonfree delivery from €35	€17.95	€0.199 /capsule	49
64	HSN Vitamina D3 Vegana 1000 IU · 120 cápsulas	Amazonfree delivery from €35	€8.90	€0.074 /capsule€0.074 /1,000 IU	49
65	Vitamina D3 4000 UI + K2 MK-7 Liposomada 60 Cápsulas	Amazonfree delivery from €35	€17.90	€0.298 /capsule€0.075 /1,000 IU	49
66	HSN Vitamina D3 + K2 Vegana (2000UI + 100mcg) · 120 cápsulas	Amazonfree delivery from €35	€19.00	€0.158 /capsule€0.079 /1,000 IU	49
67	Nature's Bounty Vitamina D3 1000 UI · 100 comprimidos	Amazonfree delivery from €35	€8.95	€0.089 /capsule€0.089 /1,000 IU	49
68	WeBotanix · Fórmula Vitamina D3 y K2 4000 UI con · 60 cápsulas	Amazonfree delivery from €35	€21.55	€0.359 /capsule€0.090 /1,000 IU	49
69	Fepadiet Fepa Vitamina D3 Liposomada 400 Ui 40 caps · 2/2 requirements	PromoFarma	€17.84	€0.446 /capsule€1.11 /1,000 IU	49
70	Solgar Vitamina D3 2200 UI (55 µg) · 50 cápsulas	Amazonfree delivery from €35	€11.11	€0.222 /capsule€0.101 /1,000 IU	48
71	Lamberts Vitamina D3 2000 UI (50 µg) · 120 cápsulas	Amazonfree delivery from €35	€26.71	€0.223 /capsule€0.111 /1,000 IU	48
72	Vitamina D3 y K2 10000UI · 60 uds	Amazonfree delivery from €35	€19.62	€0.327 /capsule€0.033 /1,000 IU	48
73	Vitamina D3 · 2000 UI (50 µg) · 60 cápsulas	Amazonfree delivery from €35	€16.99	€0.283 /capsule€0.142 /1,000 IU	48
74	Lamberts Vitamina D3 1000 UI (25 µg) · 120 cápsulas	Amazonfree delivery from €35	€18.99	€0.158 /capsule€0.158 /1,000 IU	48
75	Tres60 Vitamina D3 + K2 + Magnesio · 60 cápsulas	Amazonfree delivery from €35	€23.90	€0.398 /capsule€0.199 /1,000 IU	48
76	Vitamina D3 y K2 MK7 All-Trans · 120 cápsulas	Amazonfree delivery from €35	€24.99	€0.208 /capsule€0.208 /1,000 IU	47
77	Nutilab Vitamina D3 250 mg 60 caps · 1/2 requirements	PromoFarma	€11.98	€0.200 /capsule	46
78	Prescription Nature Zinc Vitamina D3 60 caps2.0 (1) · 1/2 requirements	PromoFarma	€10.42	€0.174 /capsule	46
79	Vecos Nucoceutical Vecos Nutraceúticals Vitamina D3 + K2 60 caps5.0 (1) · 1/2 requirements	PromoFarma	€14.89	€0.248 /capsule	46
80	Arkopharma Arkocaps Vitamina D3 45 caps · 1/2 requirementspricey now	PromoFarma	€11.27	€0.250 /capsule	46
81	Méderi Mederi Vitamina D3 + K2 120 Perlas4.0 (1) · 1/2 requirements	PromoFarma	€31.74	€0.265 /capsule	45
82	Biover Bhealthy Vitamina D3 Plus 45caps · 1/2 requirements	PromoFarma	€16.84	€0.374 /capsule	45
83	KAL Rex Vitamin D 400 Ui 90 caps · 1/2 requirements	PromoFarma	€13.89	€0.154 /capsule€0.386 /1,000 IU	44
84	Natural Force Calcium Magnesium Zinc Vitamina D 90caps5.0 (1) · 0/2 requirements	PromoFarma	€13.49	€0.150 /capsule	42
85	BLUECUBE Vitamina D 2000 60 caps5.0 (2) · 0/2 requirements	PromoFarma	€10.47	€0.175 /capsule	42
86	ESI Vitamina D 30 Tabletas4.0 (1) · 0/2 requirements	PromoFarma	€6.99	€0.233 /capsule	41

86 products in this table

Questions about Amazon and PromoFarma for vitamin D

Answered with the data on this page

Amazon or PromoFarma for vitamin D?: On price per capsule, Amazon: its median is €0.105/capsule against €0.233/capsule at PromoFarma, which is 122 % 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 vitamin D across the two stores?: Vitamina D3-4000 UI – Alta Concentración – Cura de 6 Meses | Defensas - Inmunidad y Salud Ósea - 365 Comprimidos - Bienestar Diario Para Todo El Año Con Vitaminas y Minerales - Vitavea from Amazon, at €0.022/capsule (365 capsules pack for €8.18), at verification level 1 out of 4.
Why don’t Amazon and PromoFarma cost the same?: PromoFarma costs 122 % more per capsule than Amazon (€0.233/capsule against €0.105/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). Amazon 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.
Which of the two stores scores better?: Vitamina D3-4000 UI – Alta Concentración – Cura de 6 Meses | Defensas - Inmunidad y Salud Ósea - 365 Comprimidos - Bienestar Diario Para Todo El Año Con Vitaminas y Minerales - Vitavea from Amazon, with 82 out of 100. The score is 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, and it is computed without looking at affiliate links. Prices from October 15, 2026.

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