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Vitamin B12

Also called B12, cobalamin, methylcobalamin and 3 more

cyanocobalamin, adenosylcobalamin, hydroxocobalamin.

Cheapest vitamin B12 methylcobalamin: 2p per 1 mg at WeightWorld, of 24 products at 8 shops. Price checked 22 October 2026.

The best price per 1 mg and per month, form by form, across 15 UK retailers, and where to buy it cheapest. A unit for comparing, not advice.

Email me when it gets cheaper ↓

Comparing vitamin B12

Labels give cobalamin in micrograms, and some in milligrams: 1 mg is 1,000 mcg. We put every product in one unit before pricing it. Vitamin B12 comes as methylcobalamin, cyanocobalamin, hydroxocobalamin and form not stated, and each form has its own table, because someone buying one would not usually take another as a like-for-like substitute. A product with one other ingredient is ranked here with an “also contains” note; products that combine vitamin B12 with several others are listed separately, because their price buys more than cobalamin. 1 mg is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

Vitamin B12 Methylcobalamin

Most prices last checked: ; an older price shows its own date. Ranked purely by price per 1 mg — a comparison unit, not a recommendation. We earn commission when you buy through these links; it never affects the order.

5 of the 10 cheapest links on this page earn us nothing; the order is price alone. Shop by shop

Compared at 1 mg. Enter the amount you take to see your own costs.

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Vitamin B12 Methylcobalamin: products ranked by price per 1 mg
RankProductPer 1 mgPer monthLastsBuyHow it is worked out
1
Cheapest per doseVitamin B12 Methylcobalamin TabletsWeightWorld · 450 servings · 1 mg a servingDetails and price historyAdd to my stack
2p60p1.2 years£8.99View at WeightWorld (opens in a new tab)Price checked Free delivery over £35.00, otherwise £1.99 · 2–3 working daysAmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 450 (as stated on the label)
  • In the pack: 450 × 1 mg = 450 mg
  • £8.99 ÷ 450 mg × 1 mg = 2p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • servings stated “Servings per Container: 450”
  • units per serving “Serving Size: 1 Tablets”
  • amount per serving “Vitamin B12 (Methylcobalamin) 100% Pure ; 1000 mcg”

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2
Best value under 6 months' supplyVitamin B12 Tablets 1000mcg180 tablets · 180 servings · 1 mg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarian
3p83p6 months£4.99View at Bulk (opens in a new tab)Price checked Free delivery over £49.00, otherwise £3.95 · 2–3 daysAmazonBuy a different pack size on Amazon (opens in a new tab)
Show the working
  • Servings: 180 ÷ 1 per serving = 180
  • In the pack: 180 × 1 mg = 180 mg
  • £4.99 ÷ 180 mg × 1 mg = 2.77p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “180 Tablets”
  • units per serving “Take 1 tablet per day”
  • amount per serving “Vitamin B12 ; 1000μg (Methylcobalamin) ; 40000”

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3
Vitamin B12 Tablets 1000mcg60 tablets · 60 servings · 1 mg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarian
4p£1.252 months£2.49View at Bulk (opens in a new tab)Price checked Free delivery over £49.00, otherwise £3.95 · 2–3 daysAmazonBuy this product on Amazon (opens in a new tab)
Show the working
  • Servings: 60 ÷ 1 per serving = 60
  • In the pack: 60 × 1 mg = 60 mg
  • £2.49 ÷ 60 mg × 1 mg = 4.15p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 Tablets”
  • units per serving “Per Serving (1 Tablet)”
  • amount per serving “1000μg (Methylcobalamin)”

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4
Vitamin B12 Chewable TabletsWeightWorld · 400 servings · 1 mg a servingDetails and price historyAdd to my stack
4p£1.261.1 years£16.79View at WeightWorld (opens in a new tab)Price checked Free delivery over £35.00, otherwise £1.99 · 2–3 working daysAmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 400 (as stated on the label)
  • In the pack: 400 × 1 mg = 400 mg
  • £16.79 ÷ 400 mg × 1 mg = 4.2p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • servings stated “Servings per Container: 400”
  • units per serving “Serving Size: 1 Tablet”
  • amount per serving “Vitamin B12 (Methylcobalamin) 100% Pure ; 1000 mcg”

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5
Vitamin B12 240 Tablets240 tablets · 240 servings · 1 mg a servingDetails and price historyAdd to my stackalso contains mct oil
7p£2.208 months£17.59View at Healthspan (opens in a new tab)Price checked Free UK delivery over £30.00, otherwise £2.45 · about 3–4 working daysAmazonBuy this product on Amazon (opens in a new tab)
Show the working
  • Servings: 240 ÷ 1 per serving = 240
  • In the pack: 240 × 1 mg = 240 mg
  • £17.59 ÷ 240 mg × 1 mg = 7.33p per 1 mg
  • Amount per serving: stated on the label.
  • Also contains: mct oil. The price counts the vitamin b12 only.
What the retailer's listing says
  • pack units “240 Tablets”
  • units per serving “Swallow 1 tablet daily with water”
  • amount per serving “Vitamin B12 ; 1000 µg ; 40000% NRV”
  • form raw “Methylcobalamin”

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6
Vitamin B12 (Methylcobalamin) 1,000µg - Reduce Tiredness and Fatigue, Suitable for Plant Based Diet180 tablets · 180 servings · 1 mg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarian
8p£2.256 months£13.50View at Lamberts Healthcare (Nature's Best) (opens in a new tab)Free UK delivery over £20.00, otherwise £2.50 · usually 3–4 working days, up to 10 at busy timesAmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 180 ÷ 1 per serving = 180
  • In the pack: 180 × 1 mg = 180 mg
  • £13.50 ÷ 180 mg × 1 mg = 7.5p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Specifications: 180 Tablets”
  • units per serving “Daily Intake 1 tablet per day”
  • amount per serving “delivers a daily intake of 1000µg of active methylcobalamin”

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7
Vitamin B12 Spray - Berry - 1 ozHealf · 120 servings · 1.5 mg a servingDetails and price historyAdd to my stackBerryclaimed: vegan
9p£2.856 months£17.09View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 120 (as stated on the label)
  • In the pack: 120 × 1.5 mg = 180 mg
  • £17.09 ÷ 180 mg × 1 mg = 9.49p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • servings stated “Servings Per Container: About 120”
  • units per serving “2 Sprays (0.3mL)”
  • amount per serving “Vitamin B12 (as Methylcobalamin) ; 1500 mcg”

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8
Vitamin B12 Methylcobalamin 1000mcgHealf · 150 tablets · 150 servings · 1 mg a servingDetails and price historyAdd to my stack
12p£3.705 months£18.49View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 150 ÷ 1 per serving = 150
  • In the pack: 150 × 1 mg = 150 mg
  • £18.49 ÷ 150 mg × 1 mg = 12.3p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “150 tabs”
  • servings stated “Servings Per Container: 150”
  • units per serving “Serving Size: 1 Tablet”
  • amount per serving “(Methylcobalamin) ; 1000 mcg”

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9
Vitamin B12 GummiesWeightWorld · 120 servings · 1 mg a servingDetails and price historyAdd to my stack
14p£4.124 months£16.49View at WeightWorld (opens in a new tab)Price checked Free delivery over £35.00, otherwise £1.99 · 2–3 working daysAmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 120 (as stated on the label)
  • In the pack: 120 × 1 mg = 120 mg
  • £16.49 ÷ 120 mg × 1 mg = 13.7p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • servings stated “Servings per Container: 120”
  • units per serving “Serving Size: 1 Gummy”
  • amount per serving “Vitamin B12 (as Methylcobalamin) ; 1000 mcg”

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10
Vitamin B12 120 TabletsHealthspan · 120 tablets · 120 servings · 1 mg a servingDetails and price historyAdd to my stack
15p£4.504 months£17.99View at Healthspan (opens in a new tab)Price checked Free UK delivery over £30.00, otherwise £2.45 · about 3–4 working daysAmazonBuy this product on Amazon (opens in a new tab)
Show the working
  • Servings: 120 ÷ 1 per serving = 120
  • In the pack: 120 × 1 mg = 120 mg
  • £17.99 ÷ 120 mg × 1 mg = 15p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “120 Tablets”
  • units per serving “Swallow 1 tablet daily”
  • amount per serving “Vitamin B12 ; 1000 µg ; 40000% NRV”
  • form raw “Methylcobalamin”

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11
Methyl B-12, Methylcobalamin 500 MCG2 tablets a day for 1 mgHealf · 100 tablets · 100 servings · 500 µg a servingDetails and price historyAdd to my stackCherryclaimed: veganclaimed: gluten-free
17p£5.0150 days£8.35View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 100 ÷ 1 per serving = 100
  • In the pack: 100 × 500 µg = 50 mg
  • £8.35 ÷ 50 mg × 1 mg = 16.7p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “100 tabs”
  • servings stated “Servings Per Container: 100”
  • units per serving “Serving Size: 1 Tablet”
  • amount per serving “Vitamin B12 (as Methylcobalamin) ; 500 mcg”

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12
Vitamin B12 - RaspberryHealf · 120 tablets · 120 servings · 1 mg a servingDetails and price historyAdd to my stackRaspberryclaimed: vegan
18p£5.524 months£22.09View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 120 ÷ 1 per serving = 120
  • In the pack: 120 × 1 mg = 120 mg
  • £22.09 ÷ 120 mg × 1 mg = 18.4p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “120 tabs”
  • units per serving “Recommended use: 1 tablet daily”
  • amount per serving “vitamin B12 (methylcobalamin) 1000 mcg”

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13
Methyl B12 - 1 ozHealf · 175 servings · 500 µg a servingDetails and price historyAdd to my stack
21p£6.383 months£18.61View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 175 (as stated on the label)
  • In the pack: 175 × 500 µg = 87.5 mg
  • £18.61 ÷ 87.5 mg × 1 mg = 21.3p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • servings stated “Servings Per Container: 175”
  • units per serving “1 spray (0.172ml)”
  • amount per serving “Vitamin B12 (as Methylcobalamin) ; 500 mcg”

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14
B12 (methylcobalamin)Healf · 60 capsules · 60 servings · 1 mg a servingDetails and price historyAdd to my stackclaimed: vegetarian
26p£7.752 months£15.49View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 60 ÷ 1 per serving = 60
  • In the pack: 60 × 1 mg = 60 mg
  • £15.49 ÷ 60 mg × 1 mg = 25.8p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 caps”
  • servings stated “Servings Per Container: 60”
  • units per serving “Serving Size: 1 capsule”
  • amount per serving “Vitamin B12 (as Methylcobalamin) ; 1000 mcg”

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15
B12 Folate2 capsules a day for 1 mgHealf · 60 capsules · 60 servings · 800 µg a servingDetails and price historyAdd to my stackalso contains vitamin b9claimed: vegetarian
30p£9.0648 days£14.49View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 60 ÷ 1 per serving = 60
  • In the pack: 60 × 800 µg = 48 mg
  • £14.49 ÷ 48 mg × 1 mg = 30.2p per 1 mg
  • Amount per serving: stated on the label.
  • Also contains: vitamin b9. The price counts the vitamin b12 only.
What the retailer's listing says
  • pack units “60 caps”
  • servings stated “Servings Per Container: 60”
  • units per serving “Serving Size: 1 capsule”
  • amount per serving “Vitamin B12 (as Methylcobalamin) ; 800 mcg”

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16
Vitamin B12Healf · 60 capsules · 60 servings · 1 mg a servingDetails and price historyAdd to my stackHPMC capsule, the listing says
31p£9.242 months£18.49View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 60 ÷ 1 per serving = 60
  • In the pack: 60 × 1 mg = 60 mg
  • £18.49 ÷ 60 mg × 1 mg = 30.8p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 caps”
  • servings stated “Servings Per Container: 60”
  • units per serving “Serving Size: 1 Capsule”
  • amount per serving “Vitamin B12 (as Methylcobalamin) ; 1 mg ; 40000%”

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17
Liposomal Methyl B-12Healf · 30 ml · 90.9 servings · 1 mg a servingDetails and price historyAdd to my stack
35p£10.563 months£31.99View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 30 ÷ 0.33 per serving = 90.9
  • In the pack: 90.9 × 1 mg = 90.9 mg
  • £31.99 ÷ 90.9 mg × 1 mg = 35.2p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “30ml”
  • servings stated “Servings Per Container: 90”
  • units per serving “Serving Size: 2 Pumps (0.33mL)”
  • amount per serving “Vitamin B12 (as Methylcobalamin) ; 1000 mcg”

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18
B12 (methylcobalamin)W-Wellness · 60 capsules · 60 servings · 1 mg a servingDetails and price historyAdd to my stackclaimed: vegetarian
37p£11.182 months£22.35View at W-Wellness (opens in a new tab)Free UK delivery from £50.00, otherwise £3.99 · 2–4 working days to dispatchAmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 60 ÷ 1 per serving = 60
  • In the pack: 60 × 1 mg = 60 mg
  • £22.35 ÷ 60 mg × 1 mg = 37.3p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Contains: 60 capsules”
  • units per serving “Each vegetarian capsule delivers a carefully measured amount designed for convenient, once-daily use”
  • amount per serving “provide a high-strength 1000µg dose of vitamin B12”

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19
High Strength Vitamin B12 250 µg 60 Tablets4 tablets a day for 1 mg60 tablets · 60 servings · 250 µg a servingDetails and price historyAdd to my stack
43p£13.0015 days£6.50View at Boots (opens in a new tab)Price checked Free delivery over £25.00, otherwise £3.95AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 60 ÷ 1 per serving = 60
  • In the pack: 60 × 250 µg = 15 mg
  • £6.50 ÷ 15 mg × 1 mg = 43.3p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 Tablets”
  • units per serving “Take 1 tablet a day”
  • amount per serving “Vitamin B12 250 µg”

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20
B12 LiquidHealf · 30 ml · 30 servings · 1 mg a servingDetails and price historyAdd to my stack
62p£18.5030 days£18.50View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 30 ÷ 1 per serving = 30
  • In the pack: 30 × 1 mg = 30 mg
  • £18.50 ÷ 30 mg × 1 mg = 61.7p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “30ml”
  • servings stated “Servings Per Container: 30”
  • units per serving “Serving Size: 1 full dropper (1ml)”
  • amount per serving “Vitamin B12 ; 1000 mcg”

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21
Vitamin B12 (Methylcobalamin) 100µg - Reduce Tiredness and Fatigue, Vegan Friendly10 tablets a day for 1 mg100 tablets · 100 servings · 100 µg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarianclaimed: gluten-free
65p£19.5010 days£6.50View at Lamberts Healthcare (Nature's Best) (opens in a new tab)Free UK delivery over £20.00, otherwise £2.50 · usually 3–4 working days, up to 10 at busy timesAmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 100 ÷ 1 per serving = 100
  • In the pack: 100 × 100 µg = 10 mg
  • £6.50 ÷ 10 mg × 1 mg = 65p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Specifications: 100 Tablets”
  • units per serving “Daily Intake 1 tablet daily”
  • amount per serving “Strength / Level 100µg per tablet”

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22
Liposomal Vitamin B12 2500mcg - Strawberry FlavourHealf · 30 sachets · 30 servings · 2.5 mg a servingDetails and price historyAdd to my stackStrawberryclaimed: vegan
67p£20.002 months£49.99View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 30 ÷ 1 per serving = 30
  • In the pack: 30 × 2.5 mg = 75 mg
  • £49.99 ÷ 75 mg × 1 mg = 66.7p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “30 x 10ml sachets”
  • units per serving “Take one sachet a day”
  • amount per serving “2500mcg Methylcobalamin per sachet”

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23
Liposomal Vitamin B12 2500mcg - Strawberry FlavourHealf · 14 sachets · 14 servings · 2.5 mg a servingDetails and price historyAdd to my stackStrawberryclaimed: vegan
71p£21.4235 days£24.99View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 14 ÷ 1 per serving = 14
  • In the pack: 14 × 2.5 mg = 35 mg
  • £24.99 ÷ 35 mg × 1 mg = 71.4p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “14 x 10ml sachets”
  • units per serving “Take one sachet a day”
  • amount per serving “2500mcg Methylcobalamin per sachet”

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24
Liposomal Vitamin B12 2500mcg - Strawberry FlavourLloyds Pharmacy · 30 sachets · 30 servings · 2.5 mg a servingDetails and price historyAdd to my stackStrawberry
77p£23.002 months£57.49View at Lloyds Pharmacy (opens in a new tab)Price checked Free delivery over £30.00, otherwise £2.99 · 2–3 working days from dispatchAmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 30 ÷ 1 per serving = 30
  • In the pack: 30 × 2.5 mg = 75 mg
  • £57.49 ÷ 75 mg × 1 mg = 76.7p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “30 Sachets”
  • units per serving “Take one sachet daily”
  • amount per serving “Vitamin B12 2500mcg”

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25
Methyl B12 Spray - Strawberry - 1 ozHealf · 30 ml · 30 servings · 720 µg a servingDetails and price historyAdd to my stackStrawberry
79p£23.7422 days£17.09View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 30 ÷ 1 per serving = 30
  • In the pack: 30 × 720 µg = 21.6 mg
  • £17.09 ÷ 21.6 mg × 1 mg = 79.1p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “1 fl oz 30 mL”
  • servings stated “Servings Per Container: About 30”
  • units per serving “4 Sprays (1mL)”
  • amount per serving “Vitamin B12 (as Methylcobalamin) ; 720 mcg”

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26
B12 LiquidW-Wellness · 30 ml · 30 servings · 1 mg a servingDetails and price historyAdd to my stack
79p£23.7530 days£23.75View at W-Wellness (opens in a new tab)Free UK delivery from £50.00, otherwise £3.99 · 2–4 working days to dispatchAmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 30 ÷ 1 per serving = 30
  • In the pack: 30 × 1 mg = 30 mg
  • £23.75 ÷ 30 mg × 1 mg = 79.2p per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Size: 30ml”
  • units per serving “each 1ml serving”
  • amount per serving “1000µg of methylcobalamin in each 1ml serving”

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27
Sublingual Methyl B12Healf · 30 ml · 30 servings · 1 mg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: gluten-freeclaimed: sugar-free
£1.67£49.9530 days£49.95View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 30 ÷ 1 per serving = 30
  • In the pack: 30 × 1 mg = 30 mg
  • £49.95 ÷ 30 mg × 1 mg = £1.67 per 1 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “30ml”
  • servings stated “Servings Per Bottle: 30”
  • units per serving “Daily Serving Size: 1 ml”
  • amount per serving “Vitamin B12 1000mcg ; 40,000%”

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By shop

Each shop's vitamin B12 products, with where its cheapest sits in the market.

How we work out these prices

We count the amount of cobalamin stated on the label, converting between units (for example micrograms and IU) so every product is on the same scale.

Questions

Where can I buy vitamin B12 cheapest in the UK?

On 29 October 2026, the cheapest vitamin B12 per dose from a UK seller was Vitamin B12 Methylcobalamin Tablets at WeightWorld (2p per 1 mg, 60p a month). Then Vitamin B12 Tablets 1000mcg at Bulk (3p per 1 mg, 83p a month) and Vitamin B12 Tablets 1000mcg at Bulk (4p per 1 mg, £1.25 a month). That is by price per 1 mg, across 8 UK retailers and 27 products, with every price checked daily; the table above shows the working for each.

What is the best price per 1 mg of vitamin B12 today?

2p per 1 mg, for Vitamin B12 Methylcobalamin Tablets at WeightWorld (2p per 1 mg, 60p a month), on 29 October 2026. The dearest of the 27 products we price is £1.67 per 1 mg, and the middle one is 26p.

How much does vitamin B12 cost per month?

At one 1 mg dose a day, the cheapest works out at 60p a month, for Vitamin B12 Methylcobalamin Tablets at WeightWorld, on 29 October 2026. Across the 27 products we price it runs from 60p to £49.95 a month. A month is 30 days, and the figure follows the dose you enter in the table.

Which vitamin B12 form is cheapest per dose?

On 29 October 2026: methylcobalamin from 2p per 1 mg (WeightWorld), form not stated from 2p per 1 mg (ZipVit), cyanocobalamin from 5p per 1 mg (Healf) and hydroxocobalamin from 14p per 1 mg (Healf). The forms differ in what they contain, so this is a fact about price and not a recommendation of one over another.

Do bigger vitamin B12 packs cost less per dose?

Mostly, yes: on 29 October 2026, the 3 packs that last more than six months average 5p per 1 mg, against 41p for the 24 that last six months or less. The table marks the cheapest pack that lasts six months or less as the best value for anyone who would rather not buy a year at once.

How long does a pack of vitamin B12 last?

At one 1 mg dose a day, the packs we price last from 10 days to 1.2 years; the middle one lasts 2 months. Each row says how long its pack lasts at the dose you enter.

What does “per 1 mg” mean?

It is the unit we use to put every product on the same scale: the price of 1 mg of cobalamin, whatever the pack size or serving size. It is a comparison unit, not a recommendation of how much to take. Use the “Your daily dose” box to see costs at the amount you actually take.

Why are the vitamin b12 forms in separate tables?

We only rank products against others of the same form, because someone buying one form would not usually see another as a like-for-like substitute on price. Forms we compare separately: Methylcobalamin; Cyanocobalamin; Hydroxocobalamin; Form not stated.

Why is a product I have seen in the shops missing?

If a retailer’s listing does not let us confirm the amount per serving, the pack size or the form, we do not guess and we do not show the product. It appears once its label has been read and confirmed.

How up to date are the prices?

Prices on this page were last checked on 29 October 2026. Every table shows the date its prices were checked. Always confirm the price on the retailer’s site before buying.

Do retailers pay to appear higher?

No. We earn a commission when you buy through our links, but the order is set only by price per dose. No retailer or brand can pay for position.