Vegan live cultures: which Optibac is best for vegans?

All Optibac friendly bacteria supplements are vegetarian and approved by the Vegetarian Society. Most of our live cultures are vegan and dairy-free too. Our FAQ explains everything you need to know about vegan friendly bacteria.

There are currently around 1.5 million1 people in the UK and around 9.7 million2 in the US who class themselves as vegan, with these numbers on the increase. Vegans and vegetarians are predicted to make up a quarter of the British population in 2025, motivated by concerns about health, factory farming and animal cruelty, and the environment. Consequently, there's a huge interest in vegan supplements, including vegan live cultures.

But are friendly bacteria vegan? This article aims to answer all of your questions about taking vegan live cultures:

Vegetarian society vegan approved

Which Optibac supplements are vegan?

Becoming vegan can be bewildering, as there are so many hidden animal products in foods and drinks. Live cultures are often associated with dairy produce, so many vegans ask us if friendly bacteria are also vegan-friendly! The good news is that vegans can have live cultures: all our products are suitable for vegetarians, and the products listed below are suitable for vegans and will be labelled as vegan:

Shop all our vegan supplements.

The rest of the Optibac range may contain tiny traces of dairy, as some of our strains are cultured on a base of organic dairy & soy before being extracted. Although these products do not contain dairy as an ingredient, they are not suitable for people who are strictly adhering to a vegan diet. Read more about this here: Which Optibac are lactose & dairy free?

What are vegan live cultures?

Live cultures can only be classed as vegan when they are fermented (or grown) on a medium that does not contain any animal derived ingredients, typically dairy in the fermentation of live cultures. Whilst none of the dairy growing medium will be added to the end product, the fact that the bacteria have been grown on a dairy ‘substrate’ means that we cannot rule out possible trace amounts in the finished product. If you want a purely vegan friendly bacteria supplement, choose supplements labelled as veganAll of our certified vegan supplements have been grown on a medium that does not contain dairy or other animal-derived ingredients. These supplements have the ‘vegan approved’ certification from the Vegetarian Society and do not use or contain any other animal products. 

Some may wonder why we don’t always use a dairy-free growing medium for all our supplements, to enable our whole range to be vegan. Whilst this may sound simple, the fact is that some strains of friendly bacteria just do not grow well on a medium that does not contain any dairy. Just like you or I have our favourite foods, so do bacteria! But most good bacteria strains are happy to ferment plant-based substrates, and we still have one of the widest ranges of vegan live cultures supplements in the UK.

Which are the best vegan friendly bacteria strains?

In terms of whether certain strains of bacteria are better for vegans than others: there has been some debate as to whether the microbiome of vegans is different to those who eat animal products3.  There's no evidence to highlight any particular strains for vegans, but certainly a vegan eating a healthy diet, full of natural plant fibres and natural vegan fermented foods, will naturally be encouraging strains of live cultures in their gut which like to ferment plant-based foods. The microbiome adapts: find out more about how a vegan or vegetarian diet impacts your gut over on the Probiotics Learning Lab. 

But when it comes to choosing a vegan live cultures supplement, answer is simple: the best friendly bacteria strains for vegans are the ones which have been researched for their individual needs, especially if they have particular health concerns. Read more about how different strains have different properties. Thankfully, there are numerous highly researched vegan strains so it is easy to find the one which suits your needs best.

Some people worry about whether vegan friendly bacteria are as effective, but be reassured that in fact some of the world’s most highly researched live cultures strains are classed as vegan. The following examples are some of the most well-known and prestigious strains in use today - they are all vegan and can be found in the Optibac range:

These are just a few examples of the high quality vegan strains in the Optibac range, but all of the Optibac strains are proven to reach the gut or vagina alive. If you're not sure which are the best vegan live cultures for you, contact our Nutrition Team for free advice.

How do vegans get friendly bacteria from their diet?

There is no difference in how vegans can get good bacteria compared to omnivores. In fact, the majority of fermented foods are naturally vegan, or can be made so. For example, vegan yoghurts and yoghurt drinks can be made using dairy alternatives7,8. Those trying out a plant-based diet for the first time may experience changes in their digestion as the good bacteria flourish. One study found that men, in particular, can break wind up to 7 times more per day4!  These friendly bacteria-rich foods are easily accessible nowadays and offer global benefits, so it's great to include some in your diet if you are vegan. 

Do vegans need to take live cultures supplements?

It's highly recommended to eat a broad and varied diet if you are vegan, and you should definitely aim to eat a variety of natural fermented foods on a regular basis. However, be aware that it is not always easy to find out which strains of friendly bacteria you may be eating or drinking when you consume live cultures in fermented foods and drinks, or the number of billions. You may wish to read more about fermented foods v supplements on the Probiotics Learning Lab. Therefore, especially if they suffer from a particular symptom or health concern, it still makes sense for vegans to take a live cultures supplement containing strains that are the most appropriate for their needs.

But even if you're taking live cultures supplements, you can still eat as many yummy fermented foods as you like - Optibac products are all fine to consume alongside your favourite natural cultured foods.Check out our list of the best vegan fermented foods below.

7 of the best vegan fermented foods:

  1. Sauerkraut - delicious fermented cabbage, crunchy and tangy
  2. Kimchi - an Asian version of sauerkraut, which is sour and sometimes quite spicy
  3. Pickles - the above are examples of traditional pickled foods, but you can pickle pretty much any vegetable! Try making your own - to contain friendly bacteria however, they should be made with brine5 and not vinegar
  4. Raw apple cider vinegar - not to be confused with normal vinegar, apple cider vinegar containing 'the mother' is full of natural enzymes and friendly bacteria6
  5. Yoghurt - even though it's typically made with milk, we can't leave this old favourite out as there are so many yummy vegan versions around, made with non-dairy milks such as soya, almond or coconut milk7,8
  6. Tempeh - tofu's fermented cousin, this fermented soy bean food is much denser and more satisfying, but just as easy to flavour with your favourite spices
  7. Kombucha - as long as it's made with natural cane sugar and not honey, this delicious, slightly sparkling, slightly alcoholic drink is a delicious addition to your vegan diet


  1. Finder. 2021. Online. Available at: [Accessed 30 September 30 2021]
  2. Vegannews US. 2021. Online Available at: [Accessed 30 September 30 2021]
  3. Glick-Bauer, M., & Yeh, M.-C. (2014). The Health Advantage of a Vegan Diet: Exploring the Gut Microbiota Connection. Nutrients, 6(11), 4822–4838.
  4. Barber, Claudia, et al (2021) "Differential Effects of Western and Mediterranean-Type Diets on Gut Microbiota: A Metagenomics and Metabolomics Approach" Nutrients 13, no. 8: 2638.
  5. Ragul K, Kandasamy S, Devi PB, Shetty PH. Evaluation of functional properties of potential probiotic isolates from fermented brine pickle. Food Chem. 2020 May 1;311:126057. doi: 10.1016/j.foodchem.2019.126057. Epub 2019 Dec 14. PMID: 31869636.
  6. Cousin, F. J., Le Guellec, R., Schlusselhuber, M., Dalmasso, M., Laplace, J. M., & Cretenet, M. (2017). Microorganisms in Fermented Apple Beverages: Current Knowledge and Future Directions. Microorganisms, 5(3), 39.
  7. Pimentel TC, Costa WKAD, Barão CE, Rosset M, Magnani M. Vegan probiotic products: A modern tendency or the newest challenge in functional foods. Food Res Int. 2021 Feb;140:110033. doi: 10.1016/j.foodres.2020.110033. Epub 2020 Dec 17. PMID: 33648260.
  8. Almghawesh E, Slik S, Okkou H. Processing of Functional Yoghurt-Like Product from Soymilk Supplemented by Probiotics. Int J Food Sci. 2022 Feb 23;2022:5898537. doi: 10.1155/2022/5898537. PMID: 35252437; PMCID: PMC8890885.
  9. Koch CA, Kjeldsen EW, Frikke-Schmidt R (2023) Vegetarian or vegan diets and blood lipids: a meta-analysis of randomized trials. European Heart Journal, Volume 44, 28: 2609–2622.

This FAQ was answered by: Camilla Gray, Nutritional Therapist DipCNM.