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Sea moss

Also called irish moss, chondrus crispus, sea moss gel, wildcrafted sea moss.

The best price per 1 g and per month, form by form, across 5 UK retailers, and where to buy it cheapest. A unit for comparing, not advice.

Comparing sea moss

We count the sea moss (Irish moss) a label states per serving, whatever the pack size or the serving size, so every product sits on one scale. Products that combine sea moss with other ingredients are listed separately, because their price buys more than sea moss (Irish moss). 1 g is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

Sea moss

Prices last checked: . Ranked purely by price per 1 g — a comparison unit, not a recommendation. We earn commission when you buy through these links; it never affects the order.

Compared at 1,000 mg. Enter the amount you take to see your own costs.

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Sea moss, Sea moss: products ranked by price per 1 g
RankProductPer 1 gPer monthLastsBuyHow it is worked out
1
Nutravita High Strength Sea Moss 5000mg
Cheapest per doseHigh Strength Sea Moss 5000mgNutravita · 400 tablets · 200 servings · 333 mg a servingDetails and price historyAdd to my stack
30p£9.002 months£19.99View at Nutravita (opens in a new tab)Free delivery over £30.00, otherwise £2.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 400 ÷ 2 per serving = 200
  • In the pack: 200 × 333 mg = 66.6 g
  • £19.99 ÷ 66.6 g × 1 g = 30p per 1 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “400 Tablets”
  • units per serving “Per 2 Tablets”
  • amount per serving “[Sea Moss Extract 15:1 * ; 333mg]”
  • herb equivalent “5000mg equivalentamount of plant before extraction”

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2
KIKI Health Irish Sea Moss
Irish Sea MossHealf · 90 capsules · 90 servings · 500 mg a servingDetails and price historyAdd to my stackalso contains iodine
34p£10.3145 days£15.46View 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 × 500 mg = 45 g
  • £15.46 ÷ 45 g × 1 g = 34.4p per 1 g
  • Amount per serving: stated on the label.
  • Also contains: iodine. The price counts the sea moss only.
What the retailer's listing says
  • pack units “90 caps”
  • units per serving “139 mcg per capsule”
  • amount per serving “food supplement 500mg”

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3
ZipVit Irish Sea Moss 4000mg
Irish Sea Moss 4000mgZipVit · 360 tablets · 180 servings · 266.8 mg a servingDetails and price historyAdd to my stack
42p£12.4948 days£19.99View at ZipVit (opens in a new tab)Free deliveryAmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 360 ÷ 2 per serving = 180
  • In the pack: 180 × 266.8 mg = 48 g
  • £19.99 ÷ 48 g × 1 g = 41.6p per 1 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “4000mg - 360”
  • units per serving “Take 2 tablets daily”
  • amount per serving “Sea Moss 12:1 Extract 266.8mg”
  • herb equivalent “(Chondrus Crispus) ; 4000mg”

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4
WeightWorld Irish Sea Moss Capsules
Irish Sea Moss CapsulesWeightWorld · 120 servings · 266.7 mg a servingDetails and price historyAdd to my stackalso contains bladderwrack extract
55p£16.3932 days£17.49View at WeightWorld (opens in a new tab)Free delivery over £35.00, otherwise £1.99AmazonFind 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 × 266.7 mg = 32 g
  • £17.49 ÷ 32 g × 1 g = 54.6p per 1 g
  • Amount per serving: stated on the label.
  • Also contains: bladderwrack extract. The price counts the sea moss only.
What the retailer's listing says
  • servings stated “Servings per Container: 120”
  • units per serving “Serving Size: 1 Capsule”
  • amount per serving “Irish Sea Moss Extract 266.7mg (15:1)”
  • herb equivalent “Irish Sea Moss Extract 266.7mg (15:1) ; 4000 mg”

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5
ZipVit Irish Sea Moss 4000mg
Irish Sea Moss 4000mgZipVit · 120 tablets · 60 servings · 266.8 mg a servingDetails and price historyAdd to my stack
59p£17.7816 days£9.49View at ZipVit (opens in a new tab)Free deliveryAmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 120 ÷ 2 per serving = 60
  • In the pack: 60 × 266.8 mg = 16 g
  • £9.49 ÷ 16 g × 1 g = 59.3p per 1 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “4000mg - 120”
  • units per serving “Take 2 tablets daily”
  • amount per serving “Sea Moss 12:1 Extract 266.8mg”
  • herb equivalent “(Chondrus Crispus) ; 4000mg”

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6
Erewhon Irish Sea Moss Capsules
Irish Sea Moss CapsulesHealf · 90 capsules · 90 servings · 450 mg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: gluten-free
64p£19.2541 days£25.99View 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: 90 ÷ 1 per serving = 90
  • In the pack: 90 × 450 mg = 40.5 g
  • £25.99 ÷ 40.5 g × 1 g = 64.2p per 1 g
  • 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 Veggie Cap”
  • amount per serving “(Chondrus crispus) ; 450 mg”

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7
Holland & Barrett Sea Moss 30 Capsules
Sea Moss 30 Capsules30 capsules · 30 servings · 400 mg a servingDetails and price historyAdd to my stack
£1.37£41.2212 days£16.49View at Holland & Barrett (opens in a new tab)Free delivery over £30.00, otherwise £3.49AmazonFind 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 × 400 mg = 12 g
  • £16.49 ÷ 12 g × 1 g = £1.37 per 1 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “30 Capsules”
  • units per serving “Take 1 capsule per day”
  • amount per serving “[Sea Moss Extract (Chondrus Crispus) 20:1 extract, equivalent to 8,000mg Sea Moss ; 400mg]”

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8
Double Wood Supplements Irish Moss Extract
Irish Moss ExtractHealf · 180 capsules · 90 servings · 1.2 g a servingDetails and price historyAdd to my stackclaimed: veganOut of stock
13p£3.894 months£13.99View 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: 180 ÷ 2 per serving = 90
  • In the pack: 90 × 1.2 g = 108 g
  • £13.99 ÷ 108 g × 1 g = 13p per 1 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “180 caps”
  • servings stated “Servings Per Container: 90”
  • units per serving “Serving Size: 2 Capsules”
  • amount per serving “(Frond) ; 1200 mg”

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How we work out these prices

We count the amount of sea moss (Irish moss) per serving as stated on the label.

Questions

Where can I buy sea moss cheapest in the UK?

On 20 October 2026, the cheapest sea moss per dose from a UK seller was High Strength Sea Moss 5000mg at Nutravita (30p per 1 g, £9.00 a month). Then Irish Sea Moss at Healf (34p per 1 g, £10.31 a month) and Irish Sea Moss 4000mg at ZipVit (42p per 1 g, £12.49 a month). That is by price per 1 g, across 5 UK retailers and 8 products, with every price checked daily; the table above shows the working for each.

What is the best price per 1 g of sea moss today?

30p per 1 g, for High Strength Sea Moss 5000mg at Nutravita (30p per 1 g, £9.00 a month), on 20 October 2026. The dearest of the 8 products we price is £1.37 per 1 g, and the middle one is 48p.

How much does sea moss cost per month?

At one 1 g dose a day, the cheapest works out at £9.00 a month, for High Strength Sea Moss 5000mg at Nutravita, on 20 October 2026. Across the 8 products we price it runs from £3.89 to £41.22 a month. A month is 30 days, and the figure follows the dose you enter in the table.

How long does a pack of sea moss last?

At one 1 g dose a day, the packs we price last from 12 days to 4 months; the middle one lasts 43 days. Each row says how long its pack lasts at the dose you enter.

What does “per 1 g” mean?

It is the unit we use to put every product on the same scale: the price of 1 g of sea moss (Irish moss), 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.