The UK's No. 1 bestselling brand of friendly bacteria supplements^

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Specific digestive friendly bacteria

Whether you're heading abroad, taking a course of antibiotics or looking for a friendly bacteria supplement for your individual needs, our range has you covered.

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A person holding a box of Optibac One Week Flat supplements, with a sachet being pulled out. The box features a yellow figure illustration.
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Our digestive range

Try the Optibac digestive range for the most researched strains of friendly bacteria.

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Short-term friendly bacteria supplements

Discover our range of short-term friendly bacteria supplements, designed for specific needs and occasions. Whether you're travelling abroad, taking antibiotics, or need something for occasional use, you’ll find the right option for you.

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For Those On Antibiotics

Specially formulated for anyone aged 4 and over taking a course of antibiotics, this supplement can be taken alongside your medication. Unlike many other live cultures supplements, the strains in For Those On Antibiotics are suitable to take at the same time as your treatment.

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One Week Flat

One Week Flat is a vegan, gluten free friendly bacteria supplement with four proven strains and FOS fibres to complement the natural gut bacteria and is suitable for those with occasional bloating. In easy, flavourless sachets, it's perfect for a 7-day course or daily use.

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Optibac Travel Abroad supplement box and jar with capsules on a table, palm trees blurred in the background.

Travel Abroad

Travel Abroad is a shelf-stable friendly bacteria supplement with Lactobacilli, Bifidobacteria, and the renowned Saccharomyces boulardii, proven to survive stomach acidity and hot climates. Suitable alongside travel medications, it’s ideal for destinations like Mexico, Thailand, and India

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A unique friendly yeast

A pure Saccharomyces boulardii supplement

Saccharomyces Boulardii is a renowned friendly yeast with over 50 years of research, proven to reach the gut alive and complement the natura gut bacteria. It's fast-acting and suitable for long-term use, it’s vegan, gluten free, and needs no refrigeration - perfect for at home or on the go. Optibac was the first to introduce S. boulardii to the UK, and it’s even recommended in the 2023 World Gastroenterology Organisation guidelines.

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Scientifically proven formulation

Bifido & Fibre

This high-fibre supplement combines the renowned Bifidobacterium lactis BB-12® with 4g of natural FOS fibres to increase your natural gut bacteria. Proven to survive stomach acidity and reach the gut alive, it comes in easy, flavourless sachets that can be mixed into cool food or drink—no refrigeration required.

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