Science you can feel good about

At Optibac, we're not just science backed. We're the UK's most scientifically researched brand of friendly bacteria supplements.°

When choosing a friendly bacteria supplement, it's not just about...

Having the most strains

Having the highest billions count

Having a capsule vs a liquid

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Look beyond the billions

It's the quality of the strain that really counts

Finding the right friendly bacteria supplement comes down to one thing: the specific strain. There are thousands of them, and research shows they all do different things.

The good news? You don’t need to become a friendly bacteria expert to find your perfect supplement. For over 20 years, we’ve been studying the science so you don’t have to.

Using the world’s most researched strains, we balance quality with quantity to formulate the most trusted, recommended & researched range.^†

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Find your Optibac

Your microbiome is too important for one-size-fits-all supplements

Our award-winning range is formulated with targeted strains for your specific needs. From digestive supplements to the intimate flora & immune system, there's an Optibac for everyone.

Shop the full rangeShop the full range

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Daily & immunity

Daily friendly bacteria

Women's

Friendly bacteria for women

Optibac S. Boulardii probiotics on a table; a woman sits blurred in the background on a sofa.

Digestive

For specific digestive needs

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Babies & children

Friendly bacteria for kids

Not all science is created equal

Strains under the microscope

Easy to digest science on some of our world renowned strains, and where to find them...

Lactobacillus rhamnosus GG

The most researched strain of friendly bacteria in the world, extensively studied across all age groups. Find this strain in our Babies & Children, Oral Care, and Women's Wellbeing supplements.

Saccharomyces boulardii

This strain of friendly yeast has been used safely around the world for over 50 years. It’s very robust and is resistant to heat, humidity and stomach acidity. Find it in S Boulardii and Oral Care.

Lactobacillus rhamnosus GR-1®

For Women, specifically designed for the vaginal microbiome, contains Lactobacillus rhamnosus GR-1^®, trialled in thousands of women worldwide.

Lactobacillus acidophilus NCFM®

The most researched strain of L. acidophilus in the world, studied in numerous large-scale scientific trials. Find it in our high-strength supplements, Every Day EXTRA and Every Day MAX.

Bifidobacterium breve M-16V®

This safe, highly researched strain has been clinically trialled in over 4,000 infants and young children, including newborns. You can find it in our Baby Drops and Babies & Children.

Bacillus coagulans Unique IS-2

One of the most researched strains of Bacillus, trialled in hundreds of children and adults. You can find it in our gummy supplements, Gut Health Gummies and Kids Gummies.

Doing good goes beyond our supplements