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Vitamin K1

Also called K1, phylloquinone, phytonadione, phytomenadione.

The best price per 100 µg and per month, form by form, across 1 UK retailer, and where to buy it cheapest. A unit for comparing, not advice.

Comparing vitamin K1

Labels give vitamin K1 in micrograms, and some in milligrams: 100 µg is 100 mcg. We put every product in one unit before pricing it. Products that combine vitamin K1 with other ingredients are listed separately, because their price buys more than vitamin K1. 100 µg is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

Vitamin K1

Prices last checked: . Ranked purely by price per 100 µg — a comparison unit, not a recommendation. We earn commission when you buy through these links; it never affects the order.

Compared at 100 µg. Enter the amount you take to see your own costs.

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Vitamin K1, Vitamin K1: products ranked by price per 100 µg
RankProductPer 100 µgPer monthLastsBuyHow it is worked out
1
Biotics Research Bio-K-Mulsion® - 1 fl oz
Cheapest per doseBio-K-Mulsion® - 1 fl ozHealf · 750 servings · 500 µg a servingDetails and price historyAdd to my stack
1p25p10.3 years£31.82View at Healf (opens in a new tab)Free 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: 750 (as stated on the label)
  • In the pack: 750 × 500 µg = 375 mg
  • £31.82 ÷ 375 mg × 100 µg = 0.849p per 100 µg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • servings stated “Servings Per Container: 750”
  • units per serving “1 Drop (0.04mL)”
  • amount per serving “Vitamin K (as K1-phytonadione) ; 500 mcg”

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2
Thorne Vitamin K
Vitamin KHealf · 60 capsules · 60 servings · 1 mg a servingDetails and price historyAdd to my stackalso contains vitamin k2, vitamin k2 mk-4 5 mg
4p£1.201.6 years£23.99View at Healf (opens in a new tab)Free 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
  • £23.99 ÷ 60 mg × 100 µg = 4p per 100 µg
  • Amount per serving: stated on the label.
  • Also contains: vitamin k2, vitamin k2 mk-4 5 mg. The price counts the vitamin k1 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 “K1 (1 mg)”

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3
Designs For Health Liposomal D Supreme liquid
Designs for HealthLiposomal D Supreme liquidHealf · 50 ml · 100 servings · 200 µg a servingDetails and price historyAdd to my stackalso contains vitamin k2, vitamin d3claimed: vegetarianclaimed: gluten-free
23p£7.057 months£46.99View at Healf (opens in a new tab)Free 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: 50 ÷ 0.5 per serving = 100
  • In the pack: 100 × 200 µg = 20 mg
  • £46.99 ÷ 20 mg × 100 µg = 23.5p per 100 µg
  • Amount per serving: stated on the label.
  • Also contains: vitamin k2, vitamin d3. The price counts the vitamin k1 only.
What the retailer's listing says
  • pack units “50 ml”
  • servings stated “Servings Per Container: 100”
  • units per serving “Serving Size: approx. 1 Pump (0.5mL)”
  • amount per serving “Vitamin K (as Vitamin K1 Phytonadione) ; 200 mcg”

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By shop

Each shop's vitamin K1 products, with where its cheapest sits in the market.

How we work out these prices

We count the amount of vitamin K1 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 K1 cheapest in the UK?

On 20 October 2026, the cheapest vitamin K1 per dose from a UK seller was Bio-K-Mulsion® - 1 fl oz at Healf (1p per 100 µg, 25p a month). Then Vitamin K at Healf (4p per 100 µg, £1.20 a month) and Liposomal D Supreme liquid at Healf (23p per 100 µg, £7.05 a month). That is by price per 100 µg, across 1 UK retailer and 3 products, with every price checked daily; the table above shows the working for each.

What is the best price per 100 µg of vitamin K1 today?

1p per 100 µg, for Bio-K-Mulsion® - 1 fl oz at Healf (1p per 100 µg, 25p a month), on 20 October 2026. The dearest of the 3 products we price is 23p per 100 µg, and the middle one is 4p.

How much does vitamin K1 cost per month?

At one 100 µg dose a day, the cheapest works out at 25p a month, for Bio-K-Mulsion® - 1 fl oz at Healf, on 20 October 2026. Across the 3 products we price it runs from 25p to £7.05 a month. A month is 30 days, and the figure follows the dose you enter in the table.

How long does a pack of vitamin K1 last?

At one 100 µg dose a day, the packs we price last from 7 months to 10.3 years; the middle one lasts 1.6 years. Each row says how long its pack lasts at the dose you enter.

What does “per 100 µg” mean?

It is the unit we use to put every product on the same scale: the price of 100 µg of vitamin K1, 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 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 20 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.