One Week Flat 28 Sachets


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Who is it for?

Optibac One Week Flat is an affordable, 7-day course of friendly bacteria in easy-to-take sachets. It is gluten-free and therefore may be suitable for those with bloating.

Key benefits

Friendly bacteria suitable for those with bloating

• An easy, short-term option 
Designed to be taken over 7 consecutive days (1 sachet per day) 

• Scientifically proven 
Passes through stomach acidity and reaches the gut

• Quality, multi-strain formula 
Containing various high quality strains of friendly bacteria

• Highly researched strains 
Such as L. acidophilus/helveticus Rosell-52, found to support digestive enzymes including lactase & α-glucosidase, involved in the breakdown of lactose in milk & starch

• A more natural option 
Complements your natural gut bacteria, and free from artificial flavours often found in other food & drinks containing live cultures

• Highly recommended 
From the UK’s most trusted & recommended brand of friendly bacteria supplements†.

One Week Flat can be taken occasionally for 7 consecutive days once a month or on an ongoing basis.

Optibac Probiotics strains

• Lactococcus lactis Rosell-1058

• Lactobacillus casei Rosell-215

• Lactobacillus acidophilus/helveticus Rosell-52

• Bifidobacterium bifidum Rosell-71

Added nutrients

• FOS fibres

Recommended use

Natural food supplement suitable for adults and children (from 4 years onwards) with the following recommendations:

• Take 1 sachet daily for 7 consecutive days, preferably with breakfast.

• Pour an inch of water into a tall glass, leaving plenty of room for swirling.

• Shake the sachet before gently sprinkling the powder into the glass.

• Vigorously swirl the water around in the glass making sure the powder is dissolved.

We highly recommend you take One Week Flat for 7 consecutive days. Many consumers like to take this course once a month. However, it can be taken on an ongoing basis or as desired.


• Store in a cool, dry place below 25°C and out of direct sunlight.


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.


• Vegan

• Vegetarian

• Gluten free

• Yeast free

• No added sugar

• Suitable during pregnancy

• Suitable during breastfeeding

• GMO free

• Flavourless

• Free from artificial flavourings, colourings and preservatives

• No chemicals or parabens

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.

Visit the Probiotics Learning Lab to find out more about friendly bacteria supplements and bloating.



No. Live Cultures

5 billion

Added Ingredients

FOS Fibres

Recommended Use

1 sachet dail

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