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Home › Botanicals & extracts › Inulin / FOS

OptibacBotanicals & extracts

Probiotics for Babies & Children, 10 sachets

£8.75 for 10 sachets at Vitamin Planet. It carries more than one active ingredient, so it is not ranked against single-ingredient products. Each price below counts one ingredient only.

What it really costs, per 5 g£8.75One 5 g dose is our comparison unit for inulin / FOS. It is not a recommendation.
A day£8.75
A week£61.25
A month£262.50
A year£3193.75

At one 5 g dose a day, this pack lasts 1 day. A month is 30 days, so twelve of them is not quite a year.

How we worked it out

Inulin / FOS

  • Servings: 10 ÷ 1 per serving = 10
  • In the pack: 10 × 500 mg = 5 g
  • £8.75 ÷ 5 g × 5 g = £8.75 per 5 g
  • A week £8.75 × 7 = £61.25 · a month × 30 = £262.50 · a year × 365 = £3193.75
  • Amount per serving: stated on the label.

Vitamin D3

  • Servings: 10 ÷ 1 per serving = 10
  • In the pack: 10 × 100 IU = 1,000 IU
  • £8.75 ÷ 1,000 IU × 1,000 IU = £8.75 per 1,000 IU
  • A week £8.75 × 7 = £61.25 · a month × 30 = £262.50 · a year × 365 = £3193.75
  • Amount per serving: stated on the label.

The standard dose is a comparison unit, not a recommendation. Always confirm the price on the retailer's site. How we compare everything.

How it compares: inulin / FOS

All 10, ranked →
High Fibre Inulin PowderCheapest per 5 gSimply Supplements · 5 g a serving · £4.65 a month · a pack lasts 3 months15p£15.49View at Simply Supplements (opens in a new tab)
Flourishe Gut SupplementLamberts Healthcare (Nature's Best) · 5 g a serving · £4.95 a month · a pack lasts 3 months17p£16.50View at Lamberts Healthcare (opens in a new tab)
Prebiotic Inulin Fibre PowderMyprotein · 12 g a serving · £5.20 a month · a pack lasts 2 months17p£12.49View at Myprotein (opens in a new tab)
This productVitamin Planet · 500 mg a serving · £262.50 a month · a pack lasts 1 day£8.75shown above

Ranked purely by price per 5 g. 74 combination products also contain inulin / FOS.

How it compares: vitamin D3

All 207, ranked →
WeightWorldHigh-Strength Vitamin D3 TabletsCheapest per 1,000 IUWeightWorld · 4,000 IU a serving · 17p a month · a pack lasts 4.4 years1p£8.99View at WeightWorld (opens in a new tab)
ZipVitVitamin D3 4000iuZipVit · 4,000 IU a serving · 17p a month · a pack lasts 4 years1p£8.49View at ZipVit (opens in a new tab)
WeightWorldVitamin D3 + K2 (MK7) TabletsWeightWorld · 4,000 IU a serving · 21p a month · a pack lasts 4 years1p£9.99View at WeightWorld (opens in a new tab)
This productVitamin Planet · 100 IU a serving · £262.50 a month · a pack lasts 1 day£8.75shown above

Ranked purely by price per 1,000 IU. 439 combination products also contain vitamin D3.

On the label

Inulin / FOS · Inulin / FOS
500 mg per serving (stated on the label)
Vitamin D3 · Vitamin D3
100 IU per serving (stated on the label)
Pack
10 sachets · 10 servings · 1 sachet(s) a serving
Cost per serving
88p (10 servings in the pack)
More label details
Sold by
Vitamin Planet
What the listing says
“10 Sachets” · “Fructooligosaccharides (FOS 0.5g)”
Ingredients

Stabiliser: maltodextrin (natural source); Fructooligosaccharides (FOS 0.5g); Live cultures: Bifidobacterium breve M-16V, Lactobacillus rhamnosus GG, Lactobacillus rhamnosus HN001; Vitamin D3 (2.5 g100IU, 50% NRV*); Each sachet contains 3 billion live cultures guaranteed until the date of expiry.

From the Vitamin Planet listing. Check the pack itself if you have an allergy: labels mark allergens in bold.

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One 5 g dose is our comparison unit, not a recommendation.

Price history

No price change since 7 October 2026. Checked on 1 day, most recently 7 October 2026.

Price at every check
£8.75Vitamin Planet
First recorded
£8.757 Oct
Checked on
1 daysince 7 Oct

Checked once so far, on 7 October 2026.

  1. First checked at Vitamin Planet: £8.75

Questions about this product

How much does Optibac Probiotics for Babies & Children cost per 5 g?

£8.75 per 5 g, from £8.75 for 10 sachets at Vitamin Planet, checked on 7 October 2026.

How long does one pack last?

1 day at one 5 g dose. The pack holds 5 g in total.

How much does Optibac Probiotics for Babies & Children cost per 1,000 IU?

£8.75 per 1,000 IU, from £8.75 for 10 sachets at Vitamin Planet, checked on 7 October 2026.

How long does one pack last?

1 day at one 1,000 IU dose. The pack holds 1,000 IU in total.

Keep comparing

All inulin / FOSEvery form, cheapest per 5 g firstInulin / FOS guideWhat it is, why people take it, how the forms differBotanicals & extractsEverything else we price in this categoryInulin / FOS price historyEvery inulin / FOS product's price per dose and price historyBuild a basketThe cheapest way to buy several at onceHow we compareWhere every number on this page comes from