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Inulin / FOS

Also called inulin, fos, fructooligosaccharides and 4 more

fructo-oligosaccharides, chicory root fibre, chicory root fiber, chicory inulin.

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

Comparing inulin / FOS

We count the inulin / fructo-oligosaccharides a label states per serving, whatever the pack size or the serving size, so every product sits on one scale. Products that combine inulin / FOS with other ingredients are listed separately, because their price buys more than inulin / fructo-oligosaccharides. 5 g is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

Inulin / FOS

Prices last checked: . Ranked purely by price per 5 g — a comparison unit, not a recommendation. We earn commission when you buy through these links; it never affects the order.

Compared at 5,000 mg. Enter the amount you take to see your own costs.

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Inulin / FOS, Inulin / FOS: products ranked by price per 5 g
RankProductPer 5 gPer monthLastsBuyHow it is worked out
1
Simply Supplements High Fibre Inulin Powder
Cheapest per doseHigh Fibre Inulin Powder500 g · 100 servings · 5 g a servingDetails and price historyAdd to my stackclaimed: vegan
15p£4.653 months£15.49View at Simply Supplements (opens in a new tab)Free delivery from £20.00, otherwise £1.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 500 ÷ 5 per serving = 100
  • In the pack: 100 × 5 g = 500 g
  • £15.49 ÷ 500 g × 5 g = 15.5p per 5 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • confirmed values “confirmed from the retailer's own product page, not this listing's text: amount per serving 5.0; amount unit g; amount refers to compound; units per serving 5.0; pack units 500; pack unit type gram; form id inulin”

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2
Nature's Best Flourishe Gut Supplement - Maintain Normal Intestinal Health
Flourishe Gut Supplement - Maintain Normal Intestinal Health500 g · 100 servings · 5 g a servingDetails and price historyAdd to my stack
17p£4.953 months£16.50View at Lamberts Healthcare (Nature's Best) (opens in a new tab)Free delivery over £20.00, otherwise £2.50AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 500 ÷ 5 per serving = 100
  • In the pack: 100 × 5 g = 500 g
  • £16.50 ÷ 500 g × 5 g = 16.5p per 5 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Specifications: 500g”
  • units per serving “Just one heaped teaspoon typically provides 5 grams of FOS”
  • amount per serving “Just one heaped teaspoon typically provides 5 grams of FOS”

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3
Myvitamins Prebiotic Inulin Fibre Powder
Prebiotic Inulin Fibre PowderMyprotein · 360 g · 30 servings · 12 g a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarian
17p£5.202 months£12.49View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 360 ÷ 12 per serving = 30
  • In the pack: 30 × 12 g = 360 g
  • £12.49 ÷ 360 g × 5 g = 17.3p per 5 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “360g”
  • servings stated “30 SERVINGS”
  • units per serving “Per 12g”
  • amount per serving “Add 12g”

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4
Biocare FOS Powder
FOS PowderHealf · 250 g · 25 servings · 10 g a servingDetails and price historyAdd to my stack
24p£7.2350 days£12.05View 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: 250 ÷ 10 per serving = 25
  • In the pack: 25 × 10 g = 250 g
  • £12.05 ÷ 250 g × 5 g = 24.1p per 5 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “250g”
  • units per serving “per daily intake: 10 grams”
  • amount per serving “FOS ; 10g”

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5
KIKI Health Blue Agave Inulin Powder
Blue Agave Inulin PowderHealf · 250 g · 50 servings · 5 g a servingDetails and price historyAdd to my stack
26p£7.6650 days£12.77View 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: 250 ÷ 5 per serving = 50
  • In the pack: 50 × 5 g = 250 g
  • £12.77 ÷ 250 g × 5 g = 25.5p per 5 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “250g”
  • units per serving “1 heaped teaspoon (5g)”
  • amount per serving “1 heaped teaspoon (5g)”

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6
NOW Foods Inulin Prebiotic Pure Powder - 8 oz
Inulin Prebiotic Pure Powder - 8 ozHealf · 57 servings · 3.3 g a servingDetails and price historyAdd to my stack
27p£7.9738 days£9.99View 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: 57 (as stated on the label)
  • In the pack: 57 × 3.3 g = 188.1 g
  • £9.99 ÷ 188.1 g × 5 g = 26.6p per 5 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • servings stated “Servings Per Container: about 57”
  • amount per serving “Organic Inulin (FOS) (from Blue Agave) ; 3.3 g”

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7
Myvegan High Fibre Gummies - Orange
High Fibre Gummies - OrangeMyvegan · Myprotein · 60 gummies · 30 servings · 3 g a servingDetails and price historyAdd to my stackOrangeclaimed: veganclaimed: vegetarian
69p£20.8218 days£12.49View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 60 ÷ 2 per serving = 30
  • In the pack: 30 × 3 g = 90 g
  • £12.49 ÷ 90 g × 5 g = 69.4p per 5 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 gummies”
  • servings stated “30servings”
  • units per serving “Consume 2 gummies daily”
  • amount per serving “Inulin ; 3g”

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8
Hilma Fiber Gummy
Fiber GummyHealf · 60 gummies · 20 servings · 5 g a servingDetails and price historyAdd to my stack
£1.09£32.6120 days£21.74View 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 ÷ 3 per serving = 20
  • In the pack: 20 × 5 g = 100 g
  • £21.74 ÷ 100 g × 5 g = £1.09 per 5 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 gummies”
  • servings stated “Servings Per Container: 20”
  • units per serving “Serving Size: 3 Gummies”
  • amount per serving “Each serving provides 5 g of fibre from chicory root”

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9
Roundway Supplements Akkermansia & Inulin Capsules
Akkermansia & Inulin CapsulesHealf · 60 capsules · 30 servings · 275 mg a servingDetails and price historyAdd to my stackalso contains akkermansia muciniphilaclaimed: veganclaimed: gluten-free
£10.60£318.002 days£17.49View 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 ÷ 2 per serving = 30
  • In the pack: 30 × 275 mg = 8.25 g
  • £17.49 ÷ 8.25 g × 5 g = £10.60 per 5 g
  • Amount per serving: stated on the label.
  • Also contains: akkermansia muciniphila. The price counts the inulin / fos only.
What the retailer's listing says
  • pack units “60 capsules”
  • servings stated “60 Capsules. 30 Servings”
  • units per serving “Serving size: 2 Capsules a day”
  • amount per serving “Inulin Powder from Chicory Root ; 275mg”

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10
Golden Greens Greens Organic Inulin Powder
Greens Organic Inulin PowderGolden Greens · Vitamin Planet · 250 g · 50 servings · 5 g a servingDetails and price historyAdd to my stackOut of stock
25p£7.6250 days£12.70View at Vitamin Planet (opens in a new tab)Delivery £3.95AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 250 ÷ 5 per serving = 50
  • In the pack: 50 × 5 g = 250 g
  • £12.70 ÷ 250 g × 5 g = 25.4p per 5 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Powder - 250g”
  • units per serving “1 tsp (5g) per day”
  • amount per serving “1 tsp (5g) per day”

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By shop

Each shop's inulin / FOS products, with where its cheapest sits in the market.

How we work out these prices

We count the amount of inulin / fructo-oligosaccharides per serving as stated on the label.

Questions

Where can I buy inulin / FOS cheapest in the UK?

On 20 October 2026, the cheapest inulin / FOS per dose from a UK seller was High Fibre Inulin Powder at Simply Supplements (15p per 5 g, £4.65 a month). Then Flourishe Gut Supplement - Maintain Normal Intestinal Health at Lamberts Healthcare (Nature's Best) (17p per 5 g, £4.95 a month) and Prebiotic Inulin Fibre Powder at Myprotein (17p per 5 g, £5.20 a month). That is by price per 5 g, across 5 UK retailers and 10 products, with every price checked daily; the table above shows the working for each.

What is the best price per 5 g of inulin / FOS today?

15p per 5 g, for High Fibre Inulin Powder at Simply Supplements (15p per 5 g, £4.65 a month), on 20 October 2026. The dearest of the 10 products we price is £10.60 per 5 g, and the middle one is 25p.

How much does inulin / FOS cost per month?

At one 5 g dose a day, the cheapest works out at £4.65 a month, for High Fibre Inulin Powder at Simply Supplements, on 20 October 2026. Across the 10 products we price it runs from £4.65 to £318.00 a month. A month is 30 days, and the figure follows the dose you enter in the table.

How long does a pack of inulin / FOS last?

At one 5 g dose a day, the packs we price last from 2 days to 3 months; the middle one lasts 50 days. Each row says how long its pack lasts at the dose you enter.

What does “per 5 g” mean?

It is the unit we use to put every product on the same scale: the price of 5 g of inulin / fructo-oligosaccharides, 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.