Probiotics One Week Flat, 28 sachets
£27.73 for 28 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.
At one 5 g dose a day, this pack lasts 2 days. A month is 30 days, so twelve of them is not quite a year.
How we worked it out
- Servings: 28 ÷ 1 per serving = 28
- In the pack: 28 × 300 mg = 8.4 g
- £27.73 ÷ 8.4 g × 5 g = £16.51 per 5 g
- A week £16.51 × 7 = £115.54 · a month × 30 = £495.18 · a year × 365 = £6024.67
- 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 →
Ranked purely by price per 5 g. 74 combination products also contain inulin / FOS.
On the label
- Inulin / FOS · Inulin / FOS
- 300 mg per serving (stated on the label)
- Pack
- 28 sachets · 28 servings · 1 sachet(s) a serving
- Cost per serving
- 99p (28 servings in the pack)
More label details
- Sold by
- Vitamin Planet
- What the listing says
- “28 Sachets” · “Take 1 sachet daily” · “Each sachet guarantees 5 billion live cultures + 0.3g FOS fibres”
Ingredients
Maltodextrin (natural source); Fructooligosaccharides (FOS 0.3g); Live cultures: Bifidobacterium bifidum Rosell-71, Lactobacillus casei Rosell-215, Lactococcus lactis Rosell-1058 and Lactobacillus acidophilus / helveticus Rosell-52; Each sachet guarantees 5 billion live cultures + 0.3g FOS fibres.; Following the taxonomic updates by a global team of scientists and published in April 2020, a reclassification has been advised for the L. casei species. The casei strain in the Optibac One Week Flat product is now also known as Lacticaseibacillus casei Rosell-215.
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.
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Filled in from the label’s serving: 1 sachet.
What you paid
Optional. At Vitamin Planet today: £27.73.
“Order by” allows 3 working days’ delivery from Vitamin Planet and your spare days.
Price history
No price change since 7 October 2026. Checked on 1 day, most recently 7 October 2026.
- Price at every check
- £27.73Vitamin Planet
- First recorded
- £27.737 Oct
- Checked on
- 1 daysince 7 Oct
Checked once so far, on 7 October 2026.
- First checked at Vitamin Planet: £27.73
Questions about this product
How much does Optibac Probiotics One Week Flat cost per 5 g?
£16.51 per 5 g, from £27.73 for 28 sachets at Vitamin Planet, checked on 7 October 2026.
How long does one pack last?
2 days at one 5 g dose. The pack holds 8.4 g in total.