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OptiBac Probiotics Probiotics

For a flat stomach

Product rated 4.6 from 41 reviews
( Website and brand rated 4.8 from 264 reviews )

£7.24 Excl. UK Taxes

(Approximately US$ 12.16)

In Stock

This is a high quality, short term course of live cultures. 'For a flat stomach' is gluten free and therefore may be especially suitable for those with bloating.

7 sachets

What's it for?

A natural bacteria supplement from OptiBac Probiotics to be taken for 7 consecutive days. 

Who's it for?

May appeal to those with bloating who are seeking a gluten-free live cultures supplement.

Each sachet provides

5 billion live cultures + 0.3g FOS fibres.

OptiBac Probiotics 'For a flat stomach' 

'For a flat stomach' is a natural supplement containing natural bacteria (live cultures), in powdered sachets to be taken daily as a one-week course. This can be taken once a month, or as frequently as desired. Please scroll to the bottom of the page to read reviews from our customers who have tried this supplement.

Abdominal or stomach bloating may be associated with food intolerances, constipation, over-eating, PMS or intestinal gas; leaving the abdomen feeling uncomfortable, full and tight.  If you have poor digestion, waste materials and the gases they produce can remain in the gut for long periods of time, often at high temperatures and pressures.  This causes bloating and stretching of the gut walls beyond their comfortable limits. An imbalance of bacteria in the gut may result in poor digestive health, bloating, production of smelly and uncomfortable gases, and sluggish bowels. This imbalance is known as dysbiosis

Lactococcus lactis Rosell-1058

Lactococcus lactis Rosell-1058

More about 'For a Flat stomach'

Lactobacillus acidophilus Rosell-52: acidophilus is a natural resident of the intestinal microflora; this strain of acidophilus from OptiBac Probiotics has been shown to survive gastric acidity and biliary salts, and to reach the intestines without damage. 

Bifidobacterium bifidum Rosell-71: In vitro tests suggest that this strain of B. bifidum may support the production of antibodies, promotes detoxification and help to maintain resistance to bad bacteria which can cause gas and bloating. In the colon, B. bifidum flourishes well with Fructooligosaccharides where it may support the intestines and assist natural transit, promote comfort and optimise a healthy frequency and regularity of bowel movements.

Lactobacillus casei Rosell-215 is of an extensively studied species naturally residing in the intestinal flora; this strain from OptiBac Probiotics has been researched in its ability to resist gastric acidity and bile salts in order to reach your small and large intestines alive.

Lactococcus lactis Rosell-1058 is extracted from the kefir culture, and has been scientifically proven to reach the gut alive.

Fructooligosaccharide fibres (FOS) predominantly settle in the large intestine where they may act as a food source to stimulate the growth of your body's natural bacteria. 

This 7 day course is ideal for those looking for a short term, high quality natural bacteria supplement. 

See Scientific Research on live cultures and bloating


As a natural food supplement For a flat stomach can be given to adults and children from 4 years old & up, with the following recommendations: Take one sachet daily with breakfast for a 7 day course, or as professionally directed.

We highly recommend you take For a flat stomach for 7 consecutive days.  Most customers take this course once a month, but it can taken as often as desired. For more information see our FAQ: How often should I take OptiBac For a flat stomach?

For best results:

  1. Pour an inch of water into a tall glass, leaving plenty of room for swirling.
  2. Shake the sachet well before gently sprinkling in the powder.
  3. Leave powder to dissolve naturally. 
  4. Vigorously swirl the water around in the glass.
  5. Drink, wait, and enjoy the benefits!


It is not recommended to give live cultures to patients who are: severely immunosuppressed, have pancreatitis, are in the Intensive Care Unit, have blood in the stool, have central venous catheters; or to post-surgical patients with open wounds, or infants with short bowel syndrome; unless under a doctor's care.

Full Ingredients

Stabiliser: Maltodextrin; Fructooligosaccharides (FOS); live cultures: (Lactococcus lactis Rosell-1058, Lactobacillus casei Rosell-215, Lactobacillus acidophilus Rosell-52 and Bifidobacterium bifidum Rosell-71).

Each sachet guarantees 5 billion micro-organisms + 0.3g FOS fibres.


Like the rest of the OptiBac Probiotics range, this product does not require refrigeration.  

Store away from direct sunlight.

  • Vegetarian
  • No added sugars
  • Gluten free
  • Yeast free
  • Free from artificial colours
  • Flavourless
  • Live cultures
  • FOS fibres
  • Natural bacteria

Delivery Options

We endeavour to keep our delivery and shipping rates as fair as possible. There are no extra hidden admin or packaging fees.

Delivery method Price per order
UK Standard Shipping
Usually delivered within 4-7 days
UK First Class Postage
Usually delivered within 1-3 days
UK Next Day Delivery
Choose this option by 2pm Mon-Fri and your order should be with you in 24 hours.
Please only select this option if someone can sign for the order.
International - EU
Please allow 7-10 days for delivery
International - Non-EU
Please allow 7-20 days for delivery
We noticed that you're not inside Europe, so we have removed UK Taxes from the table above.

Orders placed before 2.00pm will be dispatched the same working day.

Free Delivery

We offer free delivery (UK and International) on all orders over £100. This discount will be applied automatically to your basket when you checkout.

Customer Reviews — 41 Reviews

  • Posted by Laura (Hampshire) 1 month ago

    5 stars

    "I recently tried the flat stomach sachets followed by every day caps. I get bloated constantly; every food sets me off so I reluctantly looked into probiotics (as I couldn't cut out every single food group going!) and was so pleased with this product. I didn't get on so much with the capsules so have stocked up on these flat stomach sachets and notice how much they help almost immediately. Even on my period or at the end of the day, I have still been 100% more comfortable than usual! Will be sticking with courses of these from now on!"

  • Posted by Caroline (London) 1 month ago

    1 stars

    "I took my first 7 day course of For a Flat Stomach the week before my period since that is when I usually feel the most bloated. My period started days earlier than expected and I had acne all across my forehead which I do not think I have ever had before. I did not notice any improvement whatsoever gut-wise, but I put it down to my hormones clearly being all over the place at the time. I started the second 7 day course five weeks later, this time the week after my period, but stopped taking the powder when I started bleeding and that mysterious acne reappeared. I also had stomach pains and a lot of gas. The symptoms disappeared fairly quickly after I stopped taking For a Flat Stomach. My favourite (well, used to be anyway) frozen yoghurt gives me the same symptoms. It contains chicory root, which is a prebiotic, and I am clearly very sensitive to it. Chicory root can cause miscarriage, so pregnant women are advised not to eat it, but prebiotics in supplements are supposed to be safe. My reaction to For a Flat Stomach makes me wonder, though. Having said that, I know I am not the only one who gets a lot of gas and discomfort from prebiotics, but I have not come across anyone else whilst searching the web who has experienced bleeding. If I were pregnant I would definitely avoid prebiotics anyway to be on the safe side!"

    Reply from OptiBac Probiotics

    Dear Caroline, I'm sorry to hear of your symptoms. Occasionally some people find they are sensitive to prebiotics, in that the bloating and gas can slightly worsen in the first few days, but usually the body adjusts and symptoms disappear. We have an FAQ looking at prebiotics in more detail if of interest. However, probiotics & prebiotics should not interact with hormones, and we have never come across prebiotics being associated with influencing the menstrual cycle at all. I would recommend you consult with your doctor about the unexpected bleeding. Just to reassure you whilst chicory is contraindicated in pregnancy due to components such as polyphenols, prebiotics are not known to have contraindications in pregnancy. I hope you find this information useful, please be in touch if you’d like any further information. - Megan, Naturopath & Herbalist

  • Posted by Becki M (Rutland, UK) 4 months ago

    5 stars

    "Well so this might be a bit of an odd review. But I have been using the regular 'Well Being' probiotics since August, on the recommendation of my nutritionist. They have REALLY helped enormously with my overall health! But once a month, when my period arrives, I always dip into exhaustion, terrible pain, nausea, crazy bad bloating, stomach problems and so on. It has been ruining my life for years. Last month I was looking on this website and wondered...maybe 'For A Flat Stomach' might do some good? It's worth a try! So I bought a box and I took them. You would not BELIEVE the differe... Read More »"

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