In short:

Acidophilus is a microorganism (often called a 'probiotic') from the Lactobacillus family of natural bacteria. Its full name is Lactobacillus acidophilus, or L. acidophilus for short. Acidophilus has been well-researched in areas such as digestive health and immunity. It is naturally found in the gut, and is probably the microorganism most commonly found in natural bacteria (or 'live cultures') supplements on the market today.

Lactobacillus acidophilus can be found in 8 of the 12 OptiBac Probiotics supplements. It is important to find the right type, and strength of acidophilus for you. Scroll down to find out about our products containing acidophilus, or read on for more general information.

Extra strength probiotic containing L. Acidophilus NCFM

For every day EXTRA Strength contains 5 billion viable cells of the world's most researched strain of acidophilus.

Why to choose our acidophilus

Which supplement is best for me?

Looking for a pure acidophilus supplement on its own? At OptiBac Probiotics we find that acidophilus works well when combined with other species of natural bacteria rather than on its own. We work hard to develop well-researched live cultures supplements, and as of yet, we have not found any evidence or clear benefit from taking acidophilus on its own. As a result, we created a blend of at least 5 billion live cultures of L. acidophilus NCFM® per capsule (alongside 15 billion viable cells of other well researched strains such as B. lactis Bl-04). You can find this in 'For every day EXTRA Strength'. We also have another premium choice, containing 50 billion live cultures of well researched strains; a third of which is made up of L. acidophilus NCFM®. This supplement is 'For every day MAX'.

At the end of the day, we would always insist that each customer takes the live cultures supplement that is best for them. So if you are looking for acidophilus, it's best to ask yourself why you want acidophilus, and then find the product that's right for you. There's certainly no harm in taking your acidophilus alongside other species & strains of natural bacteria. Find out more about our supplements containing acidophilus below.

Where to buy acidophilus

You can buy natural bacteria supplements containing acidophilus on our website here. The Lactobacillus acidophilus species can be found in 8 of our 12 products, and we use 3 different strains of acidophilus across the range.

We would always recommend you find the right supplement for you, as opposed to making a decision on other factors such as the amount of acidophilus in a capsule or sachet. It is after all, about quality over quantity!

Need help choosing the right type of acidophilus?

As mentioned above we use 3 different strains of acidophilus across our product range. Click on the relevant section below to find out which strain you need and what product contains them.

OptiBac Extra strength probiotic supplement containing L. Acidophilus NCFM

'For every day EXTRA Strength' (For daily wellbeing EXTRA Strength) offers a high dose of premium acidophilus and contains 5 billion viable cells of the world's most researched strain of acidophilus, L. acidophilus NCFM®.

OptiBac For every day MAX probiotic supplement containing L. Acidophilus NCFM

'For every day MAX' contains 16 billion viable cells of the world's most researched strain of acidophilus. So if you want a high dose of a premium acidophilus strain, this is the product for you.

wellbeing pro & prebiotic

'For every day' (For daily wellbeing) contains Lactobacillus acidophilus Rosell-52, which is a well-researched strain of acidophilus, found to have excellent adherence to the gut wall lining. Whilst it's not the most researched in the entire world, it is certainly amongst the top! This strain comes from one of the world's leading institutes of microbiology, the Institut Rosell, and it has been through numerous clinical trials. Although this supplement contains fewer billions of cells than the 'EXTRA Strength' version, it still provides more viable live cultures than the average yoghurt or supplement containing natural bacteria. 'For every day' (For daily wellbeing) also contains added FOS fibres (often known as 'prebiotics' - find out more about prebiotics here.)

[NB: If you are struggling to decide between these two daily supplements - OptiBac Probiotics 'For every day' and OptiBac Probiotics 'For every day EXTRA Strength' - more information to help you make your choice can be found here.]

travel probiotic

'For travelling abroad' also contains L. acidophilus Rosell-52, along with some other high quality strains from the Institut Rosell. This product is ideal for travellers; look at this supplement if you wish to support your body's natural defence against bad bacteria in the gut (which can cause diarrhoea), whilst travelling. Like the rest of the range, this product does not require refrigeration.

for those on antibiotics

'For those on antibiotics' contains just two strains; L. acidophilus Rosell-52 and L. rhamnosus Rosell-11. These strains have been extremely well-researched, in numerous clinical trials where they have been taken alongside antibiotics, and still shown to survive to reach the gut alive. Maintain gut health even during your course of antibiotics, with a live cultures supplement especially made for those taking antibiotics.

probiotic for bloating

'One week flat' (For a flat stomach) contains the same strain of acidophilus again, and is a short term course of natural bacteria especially designed for those who suffer from abdominal bloating. This supplement comes in sachets; the contents of which can be added to cold food or drink.

children's probiotic

'For babies & children' (For your child’s health) contains the same strain of acidophilus (Rosell-52), alongside two other species which are commonly found in the gut flora of healthy infants and children. Suitable for infants from birth to 12 years old, as well as pregnant and breastfeeding mothers; if you are looking for acidophilus to support your child's health, OptiBac Probiotics 'For babies & children' is ideal.

probiotics & antioxidants

'For daily immunity' is a combination of natural bacteria and polyphenols, including the antioxidant vitamin C. OptiBac Probiotics 'For daily immunity' contains a strain of acidophilus called Lactobacillus acidophilus UBLA-34. This has been showed in-vitro to have good adherence capabilities to the gut wall lining, and excellent pathogen-inhibition abilities.

In depth:

It is worth bearing in mind that acidophilus can come in varying strains (types) and strengths, and that different strains of acidophilus have different qualities. For example the strain Lactobacillus acidophilus Rosell-52 is registered in the prestigious 'Collection National de Culture de Microorganisms (CNCM)' at the Institut Pasteur in France, and has been shown to help break down lactose. On the other hand the strain Lactobacillus acidophilus NCFM® is registered at the North Carolina State University and has been clinically trialled in a huge amount of studies, in areas including IBS, health in the elderly, and pollen allergies.

Acidophilus Rosell-52

L. acidophilus Rosell-52 under the microscope. Find out about our clinical trials here.

Lactobacillus acidophilus NCFM®

With more than 35 published human clinical trials, Lactobacillus acidophilus NCFM® is probably the world's most researched strain of acidophilus. (Read some of the trials here.)

In addition to demonstrating health support in human clinical trials, this has been shown in-vitro (test tubes) to have excellent survival through the stomach acidity, as well as excellent ability to bind to the gut wall lining. These are two very important factors for a natural bacteria or live culture. The large amount of high quality and varied research really sets this strain apart from other types of acidophilus. After all, when buying acidophilus it is essential to look at the quality of the strain, and not simply buy a 'generic' acidophilus supplement!

Lactobacillus acidophilus NCFM® has been used and tested for over 40 years in different foods, and as far we know, at OptiBac Probiotics we are the only company in England to provide this strain in a supplement. It can be found in 'For every day MAX' which provides at least 16 billion live cultures of L. acidophilus NCFM® per capsule or in 'For every day EXTRA Strength' which provides at least 5 billion live cultures of L. acidophilus NCFM® per capsule (alongside another 15 billion viable cells of other well researched strains such as B. lactis Bl-04; this combination of different types of live cultures is thought to be a very positive thing).

To learn more about the importance of different species and strains, click here, or to find out more about our range, click here.


  • I have been treated with antibiotics for H pylori it has been recommended I take Advanced Acidophiles complex but for how long before I recover?

  • Dear Mrs. Cauldwell,

    Thank you for your question.

    Helicobacter pylori, usually just referred to as H. pylori, is a pathogenic bacteria that grows in the stomach and is the main cause of many ulcers and stomach inflammation. H. pylori can weaken the protective coating of the stomach, leaving it vulnerable to digestive acids and consequent irritation. Many people carry small amounts of the bacteria in their system to no ill-effect but lifestyle factors such as consumption of alcohol, coffee and smoking increase the risk of a H. pylori instigated ulcer.

    You might be interested to read a recent blog on the subject of antibiotics and H.pylori.

    H. pylori can be difficult to manage, and we would always recommend that you take the advice of your doctor, and if you wish to embark on any holistic healthcare programme to do so with the help and guidance of a qualified healthcare practitioner.

    I can't comment on the use of products from other brands, but will email you with some more useful information on natural alternatives to help support this condition.

    Wishing you the best of health,


  • What kind of Acidophilus I need for "bad breath"?
    Thank you

  • Dear Asher,

    Thank you for taking the time to leave your query.
    It's interesting that you're looking at Acidophilus to help with halitosis symptoms; there's some evidence to suggest that supplementing with live cultures may be helpful for sufferers of this condition. It's often undesirable bacteria, either present in the mouth or the intestines, that can contribute to unpleasant smelling breath, so introducing symbiotic bacteria has been shown in some studies to help.
    We've written a couple of blogs that explain a little more about this - read 'Do probiotics help with bad breath?' and 'Probiotic gum can reduce the severity of bad breath'.

    I hope that you find some useful information in these articles. If you have any other questions, it's worth checking out our very comprehensive FAQ page to see if we've covered the topic there.

    Wishing you the best of health,


  • Hello,
    I wonder if you could advise.
    I travel a lot, and would like to make yogurt wherever I am, by taking the appropriate probiotics with me, and using local milk.
    Do you have a mix that would work, or could you suggest the strains I should need?
    Thank you

  • Hello Penny,

    Thank you for your interesting question.
    The short answer is that, although we do know that some of our customers use our products as starter cultures for fermented foods and report good results, we can only recommend taking them in the capsule or sachet form as this is the way it has been tested in clinical trials. But I'd say, go for it if you want to!
    Our products are all shelf stable and don't require refrigeration, so they're great for travel, though if you're visiting a very hot country then it's best to try and keep them as cool as possible. In theory, you could try using any of the products though you might have to experiment to see which gives the best results.

    Hope this helps, and do let us know how you get on!


  • Hi,
    My son was diagnosed with C-diff after staying in the hospital for a week, the first week of October. He had to stop taking probiotics because the docs said it was making his condition worse, is this common? I'm trying to figure out if there are any acidophilus products that he can take that will help him. Can you advise me on this topic? Thanks!

  • Hello Jeffrey's Mom,

    Thanks for leaving your question.
    I have a few suggestions to make that you may find helpful, but may need a little more information from you so I'll contact you directly to discuss this further.

    Wishing you and your son the best of health,


  • I recently had a colonoscopi and took medication to clear every thing out . Since then have had a bout of flu so what do you recommend to build up my immune system .

  • Dear Margaret,

    Thank you for your question, and I'm sorry that you've been unwell recently.

    You'll be glad to know that there's been quite a bit of research into the potential of probiotics to help support immune function. You may be interested to read some of our articles that give details about some of the related studies: 'Different probiotic strains trigger different immune responses'
    'Bifidobacterium bifidum Rosell-71 reduces colds in new study '

    Based on this research, I may also be able to make some helpful recommendations for yourself, and I'll contact you directly to discuss these.

    Warm wishes,


  • I have been suffering with symptoms of tingling, burning sensations, numbness, muscle spasms and pain all over my body for a number of years. I have other symptoms as well. I have seen Neurologists and other specialists, but after many tests and scans have not been diagnosed. A few years ago a friend suggested that the problems that I am suffering could be yeast related. I recovered to a certain extent but not fully from the first horrible attack of these symptoms but they have returned. I had six courses of antibiotics over a two month period for dental issues earlier this year. I would like to know how much acidophilus I can take daily to help build up my friendly bacteria. Can I take as much as 40 billion In two capsules daily?

  • Dear Angela,

    Thank you for your query, and I'm so sorry that you've been experiencing so many unpleasant symptoms over the past few years.

    Developing research is linking gut health to so many different health issues so, unless you fall into a very small minority of people for whom probiotics may be unsuitable (see our FAQ 'When should I NOT take probiotics?'), then it's certainly worth trying them as part of your daily health care regime.

    It's thought that antibiotics have the potential to significantly disrupt the delicate intestinal microbiota, so on that basis alone you may want to consider taking a probiotic supplement to help rebalance your gut flora. Our product 'For every day EXTRA Strength includes Acidophilus strains and contains 20 billion live cultures per capsule, and yes, you can take 1 or 2 per day.

    As you have a rather complex set of symptoms, then if you are keen to take a holistic approach to your health it may be best to do so with the guidance of a qualified health professional. Your chosen therapist should assess your diet, lifestyle and personal/medical history to put together a programme that suits your individual needs, and should also work with your doctor to provide a balanced approach. Check out or to find a suitably qualified practitioner near to you.

    With very best wishes,


  • Hi
    I suffer from seborrhoeic dermatitis on my face ...will priobotics help x

  • Hi Hilda,

    Thanks for your good question.

    Emerging evidence is linking gut health to skin issues, and this connection is explained in more detail in our FAQ 'Can probiotics help with acne or spots?'

    We also have a great information page: Probiotics and eczema which was written by Dr. Georges Mouton.

    If you still have any further questions after reading these two pages, then please feel free to contact me directly on [email protected]

    Wishing you the very best of health,


  • I have been suffering with yeast infections for a number of years, can acidophilus help to combat that problem?

  • Hi Ann,

    Thank you for your question.
    For more information about the best probiotics for use in yeast infections, then see our FAQ 'Which probiotics are best for Candida?' You may also wish to check out another relevant FAQ:'will probiotics help to prevent thrush?'

    If you have any further questions after reading these comprehensive information pages, then do feel free to contact me on [email protected]

    Warm wishes,


  • Hi, I have recently been told I have bad breath to my dismay; I called into the local health shop and the lady advised me to take Acidophilus, will this help? Although I do visit the dentist on a regular basis & clean my teeth regularly.



  • Dear Jacquie,

    Thank you for your question, and for sharing your experience with us.
    Halitosis, or 'bad breath', is something that can happen to most individuals at some point in their lives, and is far more common than you might imagine.

    To read more about what causes this condition, and how probiotics such as Lactobacillus acidophilus may be able to help, read Kathy's recent blog: Do probiotics help with bad breath?

    Wishing you the best of oral health!

    Warm wishes,


  • Does acidophilus with pectin help to reduce stomach bloating?
    Thank you.

  • Response from OptiBac Probiotics

    Hello Dee,

    Thank you for your question.
    There have been some interesting studies on the effects of L. acidophilus strains on bloating symptoms, with very encouraging results. You may like to take a look at our Research on 'For every day EXTRA Strength' page, which gives details of one such clinical trial using one of our own L. acidophilus strains, L. acidophilus NCFM®:
    Ringel, Y. et al. (2008) Probiotic bacteria Lactobacillus acidophilus NCFM® and Bifidobacterium lactis Bi-07 improve symptoms of bloating in patients with function bowel disorders (FBD). Gastoenterology; Vol 134(4 Suppl. 1):A549

    If bloating is an ongoing issue for you then pectin may or may not be helpful for you; whilst this substance is thought to be beneficial in the maintenance of good gastro-intestinal health and bowel regularity, depending on the cause of your bloating symptoms, it can also cause bloating in sensitive individuals.

    I'd always recommend that all ongoing bloating symptoms are checked out by your doctor in the first instance to rule out any underlying medical causes.

    Warm wishes,


  • Hello, Recently I underwent major abdominal emergency surgery for a burst appendicitis. After 2 separate weeks in hospital, where I had intravenous antibiotics for the whole stay, I was on antibiotics for a further 10 days. I have heard that Acidopholus would help to restore the good bacteria back into my gut.

    A friend dropped round a jar of tablets for me which said "take one or two daily". How long should I do this for ?

    Helen Lunt

  • Response from OptiBac Probiotics

    Dear Helen,

    Thank you for your query, and I'm sorry that you have been having such a challenging time of it health-wise.

    It's difficult to make general recommendations regarding dosage and duration as this will depend on the strength and formulation of the probiotic supplement, and also the response of the individual to the product. It's also worth remembering that there are many different strains in the Lactobacillus acidophilus species - see our other information page 'Our probiotic strains'.

    I'll reply to you directly with some advice that I hope you find helpful.

    With best wishes,


  • I suffer with allergy and I have been take antihistamine but no solution. I bought decently acidophilus . But the allergy got worse. Did I have the right one?

  • Response from OptiBac Probiotics

    Dear Juliana,

    Thank you for your question.

    It's good that you have recognised the importance of choosing the correct strain of probiotic when trying to support different health conditions.
    There are many different types of L. Acidophilus, and some may be more helpful in alleviating allergy symptoms than others, whereas some could potentially exacerbate symptoms.

    I'll write to you directly with some recommendations, but you may also find these information pages interesting and helpful:

    'Our probiotic strains'
    'Which probiotic for histamine intolerance'
    'General allergy information'

    With best wishes,

    Nutritional Advisor
    OptiBac Probiotics

  • Hi Kerry, I'm on various tablets. I also use an inhaler one puff once a day, my question is would taking one or two Acidophilus tablets daily affect me in any way .... Thanks.

  • Response from OptiBac Probiotics

    Hi Chris,

    Thank you for your question.
    I can only give advice regarding the safety and dosage of our own product range, but in general, probiotics are thought to be extremely safe supplements to take.

    For more information, see our FAQ 'When should I NOT take probiotics?'

    They are not known to be contraindicated with any other medications or supplements, except for those with an antibiotic, anti-bacterial, or anti-fungal effect, as these may damage the delicate live cultures.
    That being said, there are some probiotics that can be taken alongside short courses of antibiotics - you can read more about this in our FAQ 'Can I take probiotics with antibiotics?'

    If you're taking long-term antibiotics and want to take a regular probiotic, then I'd recommend taking the probiotic an hour or two away from the antibiotic doses.

    I hope that this answers your question.

    Warm wishes,

    Nutritional Advisor
    OptiBac Probiotics

  • HI Penny

    I am in my 60's, and seem to have inherited my Father's chest complications, ie: asthma, chest infections, and constantly in my later life get flu bugs :( Was told about acidophilius by another colleague, that this might help with my immune system, and build me up, as after every bug, I seem totally weak. Would this probiotic be useful to me at all? So fed up of being ill, and weak :(

    Kind regards


  • Response from OptiBac Probiotics

    Dear Suzanne,

    Thank you for your question, and I'm sorry that you have been experiencing poor health.

    If you are interested in the potential of probiotics to help support immune function, you'll probably be very interested to read one of our recent blogs: 'Probiotics and Immunity: A look at the research'

    I'll also contact you directly to make some recommendations that you may find useful.

    Wishing you the very best of health,

    Nutritional Advisor
    OptiBac Probiotics

  • Hi, will acidophilus help with constipation?

  • Response from OptiBac Probiotics

    Dear Eileen,

    Thank you for your question.
    If an imbalance in gut flora is contributing to constipation symptoms, then sometimes supplementing with a good broad-strain probiotic that contains some well-researched strains of L. Acidophilus may be helpful. But in general, there is another species and strain of bacteria that has been found to be more useful in supporting bowel regularity: Bifidobacterium lactis BB-12. This strain was recently featured in one of the largest probiotic clinical trials ever, and found to help improve stool transit time.
    See our recent blog about this:

    I hope this information is of interest to you, and I'll write to you directly with some more helpful recommendations.

    Best wishes,

    Kerry Beeson,

    Customer Care and Nutritional Advisor

  • Hi. Will optibacprobiotics help or work for someone with multiple sclerosis

  • Response from OptiBac Probiotics

    This is an interesting question.

    As I’m sure you know multiple sclerosis is an autoimmune condition. Autoimmune conditions are not well understood but one of the theories is that the poor gut health may well be associated with the trigger and perpetuation of the autoimmune process. We have a blog post on our website which discusses this topic:

    Gut bacteria may influence autoimmunity

    As you know, the treatment for autoimmune conditions is the use of drugs which shut down the inappropriate immune responses. The problem with this approach is that it can result in a complex balancing act to avoid unwanted infections and other serious side effects while still using sufficient immunosuppressive treatment to control the autoimmune process. This is why we advise those who are very severely immuno-compromised not to take probiotics as it’s not always clear whether they will be able to mount an appropriate immune response. For this reason, we’d usually recommend that you consult with your doctor who will be more well-informed about your general state of health.

    With their doctor’s advice, we do have many customers with autoimmune conditions who take our probiotics as one part of a holistic treatment plan, to help keep their gut microflora as healthy as possible, with the aim of better managing the autoimmune condition.
    Once you have spoken to your doctor, you;re most welcome to contact us on [email protected] for further information.

    Kind regards,

    Kerry Beeson BSc. (Nut. Med.) Nutritional Therapist
    Customer Care and Nutritional Advisor
    OptiBac Probiotics

  • I have an E.Coli kidney infection which is causing spasm in my stomach & back. I have been on 2 antibiotics but still not cleared. I have been told to take Acidophilus but not sure what this is or how much to take. Can you advise please??

  • Response from OptiBac Probiotics

    Hi Isobel,

    Thank you for taking the time to leave your comments, and I'm sorry that you have been feeling so unwell.
    We don't offer personal replies on this page - I will email you directly with some personal recommendations - but I can answer your general queries regarding the Acidophilus bacteria.
    As this page attempts to explain, Acidophilus is one of the most well-known species of bacteria (often called a 'probiotic') from the large Lactobacillus family of bacteria. Its full name is Lactobacillus acidophilus, or L. acidophilus for short, and for full identification, these terms would be followed by the bacteria's individual strain name.
    'Acidophilus' is just one of the species in this large family: other examples of Lactobacillus species are L. rhamnosus and L. casei. For more information, see our information page: 'Our Probiotic Strains'

    Even though they sound similar, knowing the strain name is very important as not all strains of bacteria have the same actions in the body, even if they come from the same family or species.

    I'll contact you directly with some product recommendations that I hope you'll find helpful.

    Kind regards,

    Customer Care and Nutritional Advisor

  • Hi Sir/Madam,
    From what have read on your article its interesting. Please I will like to know the type of acidophilus culture that is good for yeast infection and where I can get it.

  • Response from OptiBac Probiotics

    Hello Peace Eze,

    Thanks for your question.
    We can't make personal recommendations on the web pages due to regulatory restrictions; however I'll send you a personal response with some suggestions that I hope you find helpful.

    Kind regards,

    Customer Care and Nutritional Advisor

  • Hi, Sir/Madam,

    I have receding gums, gum disease for one year now. It's not getting better. Acidophilus works for me, am I taking the right medicine? Please advise me


  • Response from OptiBac Probiotics

    Dear Rizwana,

    Thank you for your question.

    We can't give personal recommendations on the website, due to regulatory restrictions, but I can send you a direct response by email.

    Best wishes,


  • Dr.

    I'm suffering from UTI and no antibiotic worked, they all are resistant. So will this medicine work on me?

  • Response from OptiBac Probiotics

    Hello there Devendra,

    Thank you for your question, and I'm sorry that you are suffering with UTIs.

    Firstly, I should point out that probiotics are food supplements and not medicines. Also, whilst it's been shown that L. acidophilus strains may inhabit the genital area, not all strains of bacteria are the same.
    See our information page, 'Our probiotic strains' for more information about this.

    So when you're looking for a probiotic to help support your intimate health, it's best to choose one that contains strains of bacteria known to colonise in the vagina and urinary tract.

    Best wishes,

    Nutritional Advisor

  • Hi . I've been diagnosed with hietus hernia . Gastritis and duodenitis . To which I still can't get on top of . So I'm now trying your probiotics. Should these help me

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