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$34.99
(ex. tax)Pack size
Free standard delivery on orders over $100
Vegetarian
Gluten free
During pregnancy
GMO free
During breastfeeding
Vegan
Optibac Probiotics One Week Flat is an easy seven-day course of probiotics and prebiotics, formulated to support digestive health, especially in those with occasional bloating*. Contains four high-quality probiotic strains which complement the natural gut bacteria.
One Week Flat can be taken occasionally for 7 consecutive days once a month or on an ongoing basis.
Customer feedback collected via independent review platform Trustpilot. See more One Week Flat reviews for more customer opinions collected via our own website.
Natural dietary supplement suitable for adults and children (from 4 years onwards) with the following recommendations:
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.
All questions answered by probiotic experts Dr. Kate Stephens PhD (Food and Microbial Sciences) BSc(Hons) Medical Microbiology and Kerry Beeson BSc (Nutritional Medicine) Nutritional Therapist.
Definitely! Probiotics for the gut are not gender-specific, so One Week Flat is suitable for everyone over the age of 4 years who wishes to support occasional bloating, gut health, and digestion*. This includes men, women and trans and non-binary people, too!
It is recommended to take One Week Flat every day for at least one week. After that it is down to personal preference. One Week Flat can be used in the short term, as a week-long course for those experiencing occasional bloating* or if you are looking for an affordable way to 'top up' your gut bacteria every now and then. Equally, it can be used daily on an ongoing basis if you find this suits you best. There is no ‘right’ or ‘wrong’ way to take it. Here are some of the ways that our loyal One Week Flat customers take this supplement:
One Week Flat has a fairly ‘neutral’ taste and most people find it easy and pleasant to take. You may notice a slight natural sweetness which comes from the prebiotic fibers, but you can rest assured that the supplement contains no added flavourings, sugar, or sweeteners.
One Week Flat is gluten-free so is fine to be taken by those with food-related bloating. It is also suitable to be taken by those with lactose intolerance1,2,3. It contains 4 well-researched probiotic strains combined with 0.3g FOS prebiotic fibers. Individual responses to a supplement can vary, but the majority of our customers get on very well with this formulation; in fact, some people find that probiotics, such as the Lactobacillus rhamnosus Rosell-11 strain in One Week Flat, help to improve digestion* of certain foods like dairy products1,2,3.
One Week Flat contains just 7.72 calories per sachet, and 0g fat. Most of the carbohydrate in the supplement comes from the prebiotic fiber (Fructooligosaccharides, also known as FOS) which is not digested, and therefore has almost no calorific value. But the FOS feeds the friendly bacteria in our gut and helps them to flourish*.
Many probiotic strains, including those found in One Week Flat, produce digestive enzymes. These digestive enzymes are known to help break down problematic foods, preventing excessive fermentation in the gut that can cause bloating4*. The good bacteria in the supplement also help to discourage the growth of undesirable bacteria5* which tend to product a lot of gases. For these reasons, many people find that One Week Flat can be helpful for occasional bloating*.
Probiotics 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.
This is a dietary supplement and is not intended to prevent, treat or diagnose any medical conditions. Dietary supplements should not be used as a substitute for a healthy diet and 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.
1. Kocian J. (1996) ‘Further Possibilities in the Treatment of Lactose Intolerance: Lactobacilli’ Prakticky Lekar (General Practitioner). Vol. 74. pp. 212 – 214
2. 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
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.
4. 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.
5. Likotrafiti E, Rhoades J. Probiotics, Prebiotics, and Synbiotics. Science Direct. https://www.sciencedirect.com/topics/food-science/probiotic-bacteria. Published 2016. Accessed September 30, 2020.
Prebiotic FOS (Fructooligosaccharides 0.3g); Probiotic blend: Bifidobacterium bifidum Rosell-71, Lactobacillus casei Rosell-215, Lactococcus lactis Rosell-1058 and Lactobacillus acidophilus/helveticus Rosell-52; maltodextrin
Each sachet guarantees 5 billion CFU + 0.3g FOS prebiotics.
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 Probiotics One Week Flat product is now also known as Lacticaseibacillus casei Rosell-215.
If you have a specific question or need some advice on which product to choose please email enquiries@optibacprobiotics.com or click on the link below for our contact form
Need help choosing a product?This product is a total game changer. I’ve tried all the opti bac products but this one seemed to agree with me the most and I now take these daily. The sachets make my bowels regular, which is something I’ve struggled with for years. The opti bac team have been great with their customer care and have been committed to helping me find a product that works for me. Thank you!
Used to get so bloated whenever i had my period but these probiotics have put a stop to it! I take a course once a month, starting a 2 or 3 days before my period is due.
I was living with serious bloating when I discovered One Week Flat. I use it regularly now and that bloating no longer happens! I no longer live in England, but I was delighted to find that I could buy it locally. (EU)
We ship all USA orders from our warehouse in Hampshire in the UK. Due to the ongoing global pandemic many US, European and Worldwide postal routes are seeing increased transit times. Delivery times provided on this site are therefore a guide and not a guarantee. Express Services largely remain unaffected however these routes are typically subject to local tax and duties at customs.
International postal order - typically deatched and delivered within 5-10 working days.
Free standard shipping on orders over $100.
We use DHL and orders are typically dispatched and delivered within 2-5 working days.
For more details regarding international orders, currency conversion and applicable tax for orders outside the USA, please take a look at our delivery FAQ.