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OptiBac Probiotics


Suitable for Vegetarians

7 Days


Optibac One Week Flat probiotics supplement is a 7-day course of friendly bacteria in sachets for anyone looking to take an easy, high-quality, short-term supplement.  It is gluten-free and therefore may be suitable for those with bloating.

Unlike similar foods and supplements containing live cultures, Optibac Probiotics One Week Flat 7 sachets are free from ingredients such as added sugars and do not contain gluten, and may therefore be suitable for those with bloating.

Abdominal or stomach bloating is thought to 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.

  • 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 flourishes well with Fructooligosaccharides.
  • 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.

Optibac Probiotics One Week Flat is a food 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.

Directions: This food supplement is suitable for adults and children (from 4 years onwards) with the following recommendations. One sachet of Optibac Probiotics One Week Flat to be taken daily in juice or water, preferably taken with breakfast. It is recommended to be taken for 7 consecutive days.  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.

Live cultures are not recommended for those with serious medical conditions e.g. those who are severely immunosuppressed, have pancreatitis, are in the ICU, have melaena, have a central venous catheter, infants with short bowel syndrome, or patients with open wounds following major surgery; unless under a doctor's care. Keep out of reach of children.

Gut health supplements are not intended to prevent, treat or diagnose any medical conditions. If taking probiotic supplements for gut health, note that these should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. If you are taking any medications or have a serious medical condition, consult a doctor before use. Optibac supplements will not cause dependency and may be used on an ongoing basis.

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.

How often should I take Optibac One Week Flat live cultures?
Initially, it’s best to take Optibac One Week Flat daily for one week to complement your natural gut bacteria. After that, people take a week’s course every month, or whenever they feel they need it. Others prefer to take one sachet every day on an ongoing basis. All of these options are absolutely fine! See what suits you best.

Can I take Optibac One Week Flat on a calorie-controlled diet?
With only 7.72 calories per sachet, and 0g of fat, it’s easy to include Optibac One Week Flat in your calorie-controlled diet. The carbohydrate content is mostly from natural FOS fibres which are indigestible with barely any calorific content.

Does Optibac One Week Flat taste nice?
Yes! One Week Flat is carefully formulated to have a slightly sweet, ‘neutral’ flavour which most people find pleasant to take. However, be reassured that the supplement contains no added flavourings, sugar, or sweeteners – the mild sweet taste comes from the natural Fructooligosaccharide (FOS) fibres.

If I suffer bloating from dairy and gluten, can I take Optibac One Week Flat?
One Week Flat is dairy and gluten-free, so is a perfect supplement for those with food-related bloating or lactose intolerance (1,2,3). This high-quality supplement contains four, highly-researched friendly bacteria strains combined with natural FOS fibres, which together help to complement the gut microbiome.

(1). Rampengan et al., (2010), ‘Comparison of efficacies between live and killed probiotics in children with lactose malabsorption’. Southeast Asian Journal of Tropical Medicine and Public Health 41: 474-481 (2). D. H. Juers, B. W. Matthews and R. E. Huber, “LacZ β-galactosidase: Structure and function of an enzyme of historical and molecular biological importance,” Protein Science, vol. 21, no. 12, pp. 1792-1807, 2012.# (3). Oak SJ, Jha R. The effects of probiotics in lactose intolerance: A systematic review. Crit Rev Food Sci Nutr. 2019;59(11):1675-1683. doi: 10.1080/10408398.2018.1425977. Epub 2018 Feb 9. PMID: 29425071.

Is Optibac One Week Flat suitable for both men and women?
Definitely! Friendly gut bacteria are not gender-specific. Optibac One Week Flat live cultures can be taken by everyone over the age of 4 years: women, men, trans and non-binary people too!

Food supplements should not be used as a substitute for a varied diet. Store in a cool, dry place away from direct sunlight. Keep out of reach of young children. Do not exceed the daily dose.  If pregnant, or breastfeeding, or if you are taking medication, or on medical care, consult your physician prior to use.  While we work to ensure that product information on our website is correct, on occasion manufacturers may alter their ingredient lists.  Actual product packaging and materials may contain more and/or different information than that shown on our website.  All information about the products on our website is provided for information purposes only. We recommend that you do not solely rely on the information presented on our website.  Please always read the labels, warnings, and directions provided with the product before using or consuming a product.  In the event of any safety concerns or for any other information about a product please carefully read any instructions provided on the label or packaging and contact the manufacturer.  Content on this site is not intended to substitute for advice given by medical practitioner, pharmacist, or other licensed health-care professional. Contact your health-care provider immediately if you suspect that you have a medical problem.  Information and statements about products are not intended to be used to diagnose, treat, cure, or prevent any disease or health condition.  The customer reviews are only moderated for offensive content – they should not be regarded as medical or health advice; no reliance should therefore be placed on them; and they are not endorsed by Victoria Health. If you have any health problems or questions regarding the suitability of any product please contact a health professional. Products are not medicinal unless otherwise stated. Victoria Health accepts no liability for inaccuracies or misstatements about products by manufacturers or other third parties. This does not affect your statutory rights.

Product Code: OPB0002