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
  • Most trusted and recommended by UK and Irish consumers

Find out why we're the most trusted friendly bacteria brand on Trustpilot

Showing our favourite reviews

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.

  • Icon

    Backed by science

    We only use the most highly researched strains of friendly bacteria

  • Icon

    Natural ingredients

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

  • Icon

    Rated 'Excellent'

    From over 5,000 independently verified reviews on Trustpilot

  • Icon

    Friendly bacteria experts

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

  • Icon

    Targeted supplements

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

  • Icon

    Eco-conscious packaging

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

We’ve featured in…

  • Logo0
  • Logo1
  • Logo2
  • Logo3
  • Logo4
  • Logo5
  • Logo6
  • Logo7

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 £1.5 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, the UK's No 1 friendly bacteria supplement for the vagina^^.

  • 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 £12.99 Price £10.48 Price £79.00
Price per day Price per day 43p Price per day 35p to £1.40 Price per day £2.63

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.

Click to browse the full range

Follow @optibac on social media