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Selenium

Also called selenomethionine, sodium selenite.

The best price per 100 µg selenium and per month, form by form, across 7 UK retailers, and where to buy it cheapest. A unit for comparing, not advice.

Comparing selenium

Labels give selenium in micrograms, and some in milligrams: 100 µg is 100 mcg. We put every product in one unit before pricing it. Selenium comes as selenomethionine and other forms, and each form has its own table, because someone buying one would not usually take another as a like-for-like substitute. Products that combine selenium with other ingredients are listed separately, because their price buys more than selenium. 100 µg is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

Selenium Selenomethionine

Prices last checked: . Ranked purely by price per 100 µg selenium — 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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Selenium, Selenomethionine: products ranked by price per 100 µg selenium
RankProductPer 100 µg seleniumPer monthLastsBuyHow it is worked out
1
NOW Foods Selenium - 200 mcg
Cheapest per doseSelenium - 200 mcgHealf · 180 capsules · 180 servings · 200 µg a servingDetails and price historyAdd to my stack
3p93p12 months£11.19View 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: 180 ÷ 1 per serving = 180
  • In the pack: 180 × 200 µg = 36 mg
  • £11.19 ÷ 36 mg × 100 µg = 3.11p per 100 µg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “180 caps”
  • units per serving “Serving Size: 1 Veg Capsule”
  • amount per serving “Selenium (Elemental) (from L-Selenomethionine) ; 200 mcg”
  • compound mass “from 40 mg L-Selenomethionine”

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2
NOW Foods Selenium - 200 mcg
Best value under 6 months' supplySelenium - 200 mcgHealf · 90 capsules · 90 servings · 200 µg a servingDetails and price historyAdd to my stack
3p96p6 months£5.78View 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: 90 ÷ 1 per serving = 90
  • In the pack: 90 × 200 µg = 18 mg
  • £5.78 ÷ 18 mg × 100 µg = 3.21p per 100 µg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “90 caps”
  • servings stated “Servings Per Container: 90”
  • units per serving “Serving Size: 1 Veg Capsule”
  • amount per serving “Selenium (Elemental) (from L-Selenomethionine) ; 200 mcg”
  • compound mass “from 40 mg L-Selenomethionine”

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3
Codeage Liposomal Selenium
Liposomal SeleniumHealf · 180 capsules · 180 servings · 200 µg a servingDetails and price historyAdd to my stackclaimed: vegan
6p£1.8912 months£22.63View 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: 180 ÷ 1 per serving = 180
  • In the pack: 180 × 200 µg = 36 mg
  • £22.63 ÷ 36 mg × 100 µg = 6.29p per 100 µg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “180 capsules”
  • servings stated “Servings Per Container: 180”
  • units per serving “Serving Size: 1 Capsule”
  • amount per serving “Selenium (as L-Selenomethionine) ; 200 mcg”

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4
Thorne Selenium
SeleniumHealf · 60 capsules · 60 servings · 200 µg a servingDetails and price historyAdd to my stack
9p£2.644 months£10.55View 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 × 200 µg = 12 mg
  • £10.55 ÷ 12 mg × 100 µg = 8.79p per 100 µg
  • 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 “Selenium (as L-Selenomethionine) ; 200 mcg”

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5
Pure Encapsulations Selenium
SeleniumHealf · 60 capsules · 60 servings · 200 µg a servingDetails and price historyAdd to my stackclaimed: vegetarian
11p£3.194 months£12.74View 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 × 200 µg = 12 mg
  • £12.74 ÷ 12 mg × 100 µg = 10.6p per 100 µg
  • 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 “Selenium (as Selenomethionine) ; 200 mcg”

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6
SOLGAR Selenium 200mcg
Selenium 200mcgHealf · 50 tablets · 50 servings · 200 µg a servingDetails and price historyAdd to my stack
11p£3.233 months£10.78View 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 ÷ 1 per serving = 50
  • In the pack: 50 × 200 µg = 10 mg
  • £10.78 ÷ 10 mg × 100 µg = 10.8p per 100 µg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “50 tablets”
  • units per serving “one (1) tablet daily”
  • amount per serving “Selenium ; 200 mcg”

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7
Biocare Selenium
SeleniumHealf · 120 capsules · 120 servings · 100 µg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarian
13p£4.044 months£16.15View 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: 120 ÷ 1 per serving = 120
  • In the pack: 120 × 100 µg = 12 mg
  • £16.15 ÷ 12 mg × 100 µg = 13.5p per 100 µg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “120 caps”
  • units per serving “per daily intake: 1 capsule”
  • amount per serving “Selenium ; 100mcg ; 182”

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8
Biocare Selenium
SeleniumHealf · 60 capsules · 60 servings · 100 µg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarian
16p£4.802 months£9.59View 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 × 100 µg = 6 mg
  • £9.59 ÷ 6 mg × 100 µg = 16p per 100 µg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 caps”
  • units per serving “per daily intake: 1 capsule”
  • amount per serving “Selenium ; 100mcg ; 182”

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9
NOW Foods Selenium - 100 mcg
Selenium - 100 mcgHealf · 100 tablets · 100 servings · 100 µg a servingDetails and price historyAdd to my stackOut of stock
4p£1.343 months£4.48View 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: 100 ÷ 1 per serving = 100
  • In the pack: 100 × 100 µg = 10 mg
  • £4.48 ÷ 10 mg × 100 µg = 4.48p per 100 µg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “100 caps”
  • servings stated “Servings Per Container: 100”
  • units per serving “Serving Size: 1 Tablet”
  • amount per serving “Selenium (Elemental) (from 20 mg L-Selenomethionine) ; 100 mcg”
  • compound mass “from 20 mg L-Selenomethionine”

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10
Pure Encapsulations Selenium
SeleniumW-Wellness · 60 capsules · 60 servings · 200 µg a servingDetails and price historyAdd to my stackclaimed: vegetarianOut of stock
13p£4.044 months£16.15View at W-Wellness (opens in a new tab)Free delivery from £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 × 200 µg = 12 mg
  • £16.15 ÷ 12 mg × 100 µg = 13.5p per 100 µg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Contains: 60 capsules”
  • amount per serving “Each capsule delivers 200 µg of selenium”

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By shop

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

How we work out these prices

We count the elemental selenium a product provides, not the weight of the whole compound it comes in. If a label states the selenium amount, we use it. If it only gives the compound's weight, we estimate using a published conversion factor and mark the figure “estimated”. If we cannot tell which the number means, the product is left out until it can be confirmed.

Questions

Where can I buy selenium cheapest in the UK?

On 20 October 2026, the cheapest selenium per dose from a UK seller was Selenium - 200 mcg at Healf (3p per 100 µg selenium, 93p a month). Then Selenium - 200 mcg at Healf (3p per 100 µg selenium, 96p a month) and Liposomal Selenium at Healf (6p per 100 µg selenium, £1.89 a month). That is by price per 100 µg selenium, across 2 UK retailers and 10 products, with every price checked daily; the table above shows the working for each.

What is the best price per 100 µg selenium of selenium today?

3p per 100 µg selenium, for Selenium - 200 mcg at Healf (3p per 100 µg selenium, 93p a month), on 20 October 2026. The dearest of the 10 products we price is 16p per 100 µg selenium, and the middle one is 10p.

How much does selenium cost per month?

At one 100 µg dose a day, the cheapest works out at 93p a month, for Selenium - 200 mcg at Healf, on 20 October 2026. Across the 10 products we price it runs from 93p to £4.80 a month. A month is 30 days, and the figure follows the dose you enter in the table.

Which selenium form is cheapest per dose?

On 20 October 2026: other forms from 2p per 100 µg selenium (WeightWorld) and selenomethionine from 3p per 100 µg selenium (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 selenium packs cost less per dose?

Mostly, yes: on 20 October 2026, the 2 packs that last more than six months average 5p per 100 µg selenium, against 10p for the 8 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 selenium last?

At one 100 µg dose a day, the packs we price last from 2 months to 12 months; the middle one lasts 4 months. Each row says how long its pack lasts at the dose you enter.

What does “per 100 µg selenium” mean?

It is the unit we use to put every product on the same scale: the price of 100 µg of elemental selenium, 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 selenium 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: Selenomethionine; Other forms.

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.