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

  • Backed by Gold Standard Science Since 2004
  • Discover the most researched strains of friendly bacteria
  • The UK & Ireland's most trusted & recommended brand
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Find out why we're the most trusted friendly bacteria brand on Trustpilot

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Showing our favourite reviews

Best selling friendly bacteria supplements

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High quality live cultures, backed by credible science

At Optibac we specialise entirely in live cultures and have many different supplements for different life stages and individual needs.

We're the UK & Ireland's most recommended brand of friendly bacteria supplements †

So you can feel good about choosing Optibac.

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    Backed by science

    We use only the most highly researched strains of friendly bacteria, supported by over 800 human studies.

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    Natural ingredients

    We prioritise natural ingredients and take care to avoid hidden sugars and other nasties

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    Rated 'Excellent'

    From over 6,000 independently verified reviews on Trustpilot

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    Friendly bacteria experts

    We have specialised in creating friendly bacteria supplements for over 20 years.

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    Targeted supplements

    Our specialist range is designed to target individual needs and life stages

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    Eco-conscious packaging

    Including glass jars, compostable pouches and FSC®-certified cartons

What do our friendly bacteria experts say?

Talk to our team

Louise Mason

BA(Hons) DipCNM Nutritional Therapist, DipCNM Naturopath, mANP
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"When you consider the quality of the strains used, and the billions per capsule, Optibac actually offers incredible value for money!"

Sarah Oboh

BSc(Hons) Human Nutrition, Nutritionist
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"I love that the range is tailored for different life stages and needs. It takes into account our individuality - which is important."

Dr Sasivimol Ahmed

PhD, PG Dip (Personalised Nutrition), BSc (Food Science)
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"Most people don’t know that the research behind the strains is so much more important than a higher billion count per capsule."

Sam Andrews

BSc(Hons) Sport and Exercise Nutrition
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"Optibac use more natural ingredients and fewer additives than most brands. The gummies are made from fruit purees with no added sugar or flavourings – that’s rare!"

Kerry Beeson

BSc(Nut. Med.) Nutritional Therapist
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"The Optibac Probiotics range is home to the most researched strains in the world. It feels good being able to recommend supplements that you genuinely believe in!"

Camilla Gray

DipCNM Nutritional Therapist
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"My personal discovery of live cultures started with ‘One Week Flat’ 10 years ago and it’s one I still use and recommend regularly, especially before holidays or festive periods."

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We care about the health & happiness of our customers

Caring & Committed

We specialise in friendly bacteria and have created a unique range of supplements designed to meet the needs of the whole family. Our supplements are proven to not only reach the gut alive, but to complement the natural microbiome. We genuinely care about helping the planet and its people, and so far have raised over £1.8 million for charitable organisations such as Womankind Worldwide.

More about us
The Queen's Award

Proud winners of The King's Award for Enterprise

We are delighted to have been awarded the King's Award for Enterprise in 2024 for impressive international growth. This is one of the most prestigious awards for business in the UK, designed to celebrate the best of British business and recognise companies who are making an outstanding contribution to enterprise. We first won the Queen's Award in 2019.

The King's Award
Here to help

Our qualified experts are here to help

We care about helping our customers make the best possible choice from the friendly bacteria supplements in our range. Sometimes you need a little help, so we've made it as easy as possible to settle on the right friendly bacteria for your needs.

Get Started

Research backed, good bacteria for every need

At Optibac we specialise entirely in good bacteria and we understand the importance of using specific strains for your individual needs.

Learn about specific strains

  • Lactobacillus acidophilus NCFM®

    This is the most researched strain of L. acidophilus in the world and has undergone numerous large scale clinical trials. Find it in our high-strength supplements, Every Day EXTRA and Every Day MAX.

  • 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 our S Boulardii.

  • Lactobacillus rhamnosus GG

    This is the most researched strain of friendly bacteria in the world. It has been extensively studied around the world in all age groups, and we're proud to offer it in our Babies & Children supplement.

  • 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 gut health gummy supplements, Gut Health Gummies and Kids Gummies.

  • Lactobacillus rhamnosus GR-1®

    This highly studied strain for the intimate flora has been trialled in thousands of women around the world. It can be found in For Women, specifically designed for the vaginal microbiome.

  • 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.

More clinical trials, eco conscious packaging and great value for money!

Bio-Kult Symprove
No. of clinical trials No. of clinical trials 26 No. of clinical trials 19 No. of clinical trials 3
Eco conscious packaging Eco conscious packaging Yes Eco conscious packaging No Eco conscious packaging No
Daily recommendation Daily recommendation 1 capsule Daily recommendation 1 - 4 capsules Daily recommendation 70ml shot
Price Price £13.99 Price £10.48 Price £79.99
Price per day Price per day 47p Price per day 35p to £1.40 Price per day £2.86

Comparing Optibac Every Day 30 capsules, Bio-Kult Everyday (formerly Advanced Multi Strain Formulation) 30 capsules and Symprove 500ml bottle in either flavour. Clinical trials counted across strains or combination of strains in each product. Optibac Every Day packaging is widely recyclable and not in plastic containers nor blister packs.

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