For every day EXTRA Strength

30 capsules



(inc. VAT)
4.8/5 (88 reviews) Read the product reviews

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Gluten free

Gluten free

During pregnancy

During pregnancy

No dairy

No dairy

See full ingredients list


Optibac 'For every day EXTRA Strength' is a premium, 20 billion CFU, high-strength, multi-strain live cultures supplement. Contains Lactobacillus acidophilus NCFM®, considered the most researched acidophilus strain in the world.

For every day EXTRA Strength wins Rude Health Award

Live Bacteria Strains

  • Lactobacillus acidophilus NCFM®
  • Lactobacillus paracasei Lpc-37®
  • Bifidobacterium lactis Bi-07®
  • Bifidobacterium lactis Bl-04®
  • Product Description

  • How To Use

  • Ingredients

  • Help & Advice

  • Reviews

  • Delivery & Returns

  • Product Description

    Registered Nutritionist Naomi (ANutr) explains Optibac 'For every day EXTRA Strength'

    Who is Optibac ‘For Every Day EXTRA’ for?

    An advanced live cultures supplement for adults; suitable for vegans, vegetarians, and gluten-free or dairy-free diets. Recommended for optimal daily support.

    Key benefits

    • Trusted, multi-strain live cultures supplement.
    • The strains in this supplement have been collectively studied in approximately 70 clinical trials.
    • Lactobacillus and Bifidobacteria naturally occur in the digestive tract.
    • This product is designed to provide bacteria that are suited to the upper intestine (Lactobacillus species: L. acidophilus NCFM® and L. paracasei Lpc-37®) and Bifidobacterium species, which are suited to the lower intestinal tract.
    • Complements the flora naturally present in your gut.
    • Highest quality standards - subject to rigorous laboratory testing to ensure consistent quality and safety.
    • Free from FOS (Fructooligosaccharides), so may be suitable for those with IBS.
    • 20 billion CFU of friendly bacteria per serving, guaranteed until end of expiry.
    • Proven to reach the gut alive.
    • Easy-to-take capsule.
    • Suitable for those on vegetarian, vegan, dairy-free or gluten-free diets.
    • Free from GMOs and soy. No artificial colours, flavours or preservatives typically found in other food & drinks containing friendly bacteria.
    • Recommended for daily use.
    • Easy to take on the go – no refrigeration required.
    • Winner of 2020 Rude Health Awards.
    • From the UK’s most trusted & recommended brand of friendly bacteria supplements. As determined in an independent survey of 1000 British women+

    Available in two pack sizes of 30 and 90 capsules – serving size 1 capsule per day.


    Customer feedback collected via independent review platform Trustpilot. See 'Reviews' tab for more customer opinions collected via our own website.

    Customer questions

    All questions answered by probiotic experts Dr Kate Stephens PhD (Food and Microbial Sciences) BSc(Hons) Medical Microbiology and Kerry Beeson BSc (Nut. Med.) Nutritional Therapist.

    How do I choose the best live cultures for adults?

    With so many brands to choose from, it can be difficult to choose the live cultures supplement that’s right for you. We recommend looking for good bacteria which is guaranteed to reach the gut alive, contains well-researched strains, is shelf stable and does not need refrigerating. It is always good to choose a product with great customer reviews, but most importantly it should contain strains researched especially for your needs.

    What strength of live cultures should I take?

    When it comes to friendly bacteria, ‘more’ is not always ‘better’. It is more important to consider the quality of the good bacteria strains, and the number of gold standard clinical trials they have been featured in. It is also very important to ensure that this research is relevant for your individual needs. High-quality supplements containing well-researched strains1 will contain the same number of billions used in clinical trials: some studies suggest that lower dosage have more significant effects2, and therefore there is no point in offering a higher strength product (usually at higher cost) when the same effects will be achieved with a lower dose.


    1. Sanders ME, Klaenhammer TR. Invited review. The scientific basis of Lactobacillus acidophilus NCFM functionality as a probiotic. J Dairy Sci. 2001;84(2):319-331. doi:10.3168/jds.S0022-0302(01)74481-5
    2. Eskesen D, Jespersen L, Michelsen B, Whorwell PJ, Müller-Lissner S, Morberg CM. Effect of the probiotic strain Bifidobacterium animalis subsp. lactis, BB-12®, on defecation frequency in healthy subjects with low defecation frequency and abdominal discomfort: A randomised, double-blind, placebo-controlled, parallel-group trial. Br J Nutr. 2015;114(10):1638-1646. doi:10.1017/S0007114515003347

    Please note: This is a food supplement and is not intended to prevent, treat or diagnose any medical conditions.

  • How To Use

    Recommended use

    • For best results take 1 capsule daily or as professionally directed.
    • One capsule consists of a minimum of 20 billion live Lactobacillus acidophilus NCFM®, Lactobacillus paracasei Lpc-37®, Bifidobacterium lactis Bi-07® and Bifidobacterium lactis Bl-04®.
    • Can be increased to 2 capsules a day if desired - for ongoing use 1 capsule a day may suffice.
    • Take with food, preferably with breakfast.
    • For anyone unable to swallow capsules, the capsule can be opened and the contents sprinkled into cool food or drinks.
    • Do not exceed recommended daily dosage.

    Storage instructions

    No refrigeration necessary when stored in a cool, dry place below 25°C. 

    Customer Questions

    All questions answered by probiotic experts Dr Kate Stephens PhD (Food and Microbial Sciences) BSc(Hons) Medical Microbiology and Kerry Beeson BSc (Nut. Med.) Nutritional Therapist.

    Is it OK to take live cultures every day?

    Yes, it is safe and generally advisable to take live cultures daily. Good bacteria colonise in the gut for a few weeks but research1,2,3 suggests that the good bacteria strains will disappear without regular supplementation, so for this reason you might wish to take them regularly.

    Should you take live cultures on a full or empty stomach?

    The concern is that bacteria are delicate by nature, and that they may not survive stomach acid. Taking live cultures at a certain time of day (when stomach acidity is closer to neutral) could help ensure the highest survival rates of the good bacteria. Confusingly though, different healthcare professionals and live cultures manufacturers have different guidelines about when is best to take these supplements! So, let us try to clarify a few things.

    First, let us look at the logic behind taking live cultures on an empty stomach, advocated by some. Well, because acid is stimulated by consumption of food, it is thought that taking live cultures on an empty stomach (mainly first thing in the morning) is ideal because there is less residual acid in the stomach. However, it is also important to note that there is a lag time (up to 30 minutes) between when food is eaten and when acid is released into the stomach

    With a few exceptions, it’s best to take your live cultures supplements with a breakfast, as the food helps to buffer the effects of stomach acid; it may also help to facilitate the passage of the friendly bacteria through the stomach, and ensure that they are well mixed with the stomach contents as they pass into the small intestines.

    How long should you take live cultures for?

    This depends on why you are taking them: some people like to take specific strains at certain times, for example during pregnancy, when travelling abroad, or during the winter flu season. However, if you prefer general daily supplementation, then take your supplements every day. There is no current research to suggest the body becomes dependent on good bacteria, so long-term supplementation is also fine.


    1. Mimura, T. et al. (2004). 'Once daily high dose probiotic therapy (VSL#3) for maintaining remission in recurrent or refractory pouchitis'. Gut, 53(1): 108-114
    2. Morelli L et al., 2004. 'Utilisation of the intestinal tract as a delivery system for urogenital probiotics'. Journal of Clinical Gastroenterology; 38(6): 107-110
    3. Jacobsen et al., 1999. 'Screening of probiotic activities of 47 strains of Lactobacillus spp. by in vitro techniques and evaluation of the colonisation ability of 5 selected strains in humans'. Applied and Environmental Microbiology; 65 (11): 4949-4956


    Live cultures are not recommended for those with serious medical conditions e.g. those who are severely immunosuppressed, have pancreatitis, are in the ICU, have melaena, have a central venous catheter, short bowel syndrome, or patients with open wounds following major surgery; unless under a doctor's care. Keep out of reach and sight of children.

    This is a food supplement and is not intended to prevent, treat or diagnose any medical conditions. Food supplements should not be used as a substitute for a healthy diet and lifestyle. If you are taking any medications or have a serious medical condition, consult a doctor before use. Optibac supplements will not cause dependency and may be used on an ongoing basis.

  • Ingredients


    • Stabiliser: micro-crystalline cellulose
    • Live cultures: Lactobacillus acidophilus NCFM®Lactobacillus paracasei Lpc-37®Bifidobacterium lactis Bi-07®Bifidobacterium lactis Bl-04®
    • Vegetarian capsule: hydroxypropyl methylcellulose; anticaking agents: vegetable magnesium stearate, silicon dioxide.

    Each capsule guarantees 20 billion live cultures.

    Suitable for vegetarian, vegan, dairy free, gluten free, yeast-free or soy free diets. GMO free. Free from artificial flavourings, colourings and preservatives typically found in other food & drinks containing probiotics. No chemicals or parabens. Sugar free. Suitable during pregnancy and during breastfeeding. 

    This product should not be used as a substitute for a varied diet.

    Customer questions

    All questions answered by probiotic experts Dr Kate Stephens PhD (Food and Microbial Sciences) BSc(Hons) Medical Microbiology and Kerry Beeson BSc (Nut. Med.) Nutritional Therapist.

    How strong should live cultures be? 

    When choosing a live cultures supplement, remember that high strength does not always mean high quality.
    Rather than looking at the number of billions, it is far more important to look at the good bacteria strains it contains. It is best to choose a supplement containing high-quality strains which have been used in gold standard clinical trials. High-quality supplements will typically contain the same number of billions used in the clinical trials; sometimes lower doses perform just as well as high doses1 so it is not worth paying extra for more billions than you need.

    However, some people do better on a higher dose, and it is fine to experiment and increase the dose of any of our products; ultimately it all depends on your individual needs and responses to the supplement. 

    Can a live cultures supplements be too strong?

    The human gut is home to roughly 100 trillion bacteria, so the dose contained in even our highest strength live cultures supplements (20-50 billion) is comparatively small. Many people take several of our supplements at the same time, depending on their individual needs and requirements. We’re all individual, however, so if you tend to be sensitive to new foods and supplements, sometimes it’s best to introduce them gradually. If you want to start with half a dose initially, then our live cultures capsules can be opened, and the contents taken alone.

    Following the taxonomic updates published in April 2020, a reclassification has been proposed for the paracasei species, and the paracasei strain in 'For every day EXTRA Strength' may therefore now also be known as Lacticaseibacillus paracasei subsp. paracasei Lpc-37®, or still indeed as L. paracasei Lpc-37® for short.



    Customer feedback collected via independent review platform Trustpilot. See 'Reviews' tab for more customer opinions collected via our own website.


    1. Eskesen et al. (2015) Effect of the probiotic strain Bifidobacterium animalis subsp. lactis, BB-12®, on defecation frequency in healthy subjects with low defecation frequency and abdominal discomfort: a randomised, double-blind, placebo-controlled, parallel-group trial. Br J Nutr; 114, 10: 1638-46.
  • Help & Advice

    Talk to our experts

    If you have a specific question or need some advice on which product to choose please contact our Nutrition Team on +44 (0) 1264 318 881 or click on the link below for our contact form.

    Need help choosing a product?
  • Reviews

    Customer reviews

    • Great products, knowledgeable and helpful Nutritional Therapists. Have suffered for years but have huge benefit from Optibac Extra Strength. Am unable to use fos, and delighted to find products without this ingredient.

      K Blackmore - 10th May 2021

    • After just 3 weeks taking OptiBac For every day EXTRA Strength already starting to sleep better and skin much clearer- easy addition to my daily routine and will definitely continue

      Cam - 11th March 2021

    • I have been using your OptiBac 'For every day EXTRA Strength' for many years, both for myself and nutritional therapy clients, with great success for a wide range of problems. I have also found the friendly and efficient advice given by your nutritional experts to be very comprehensive and helpful. It is important to me to work with a company which specialises in probiotics as their knowledge of the subject is second to none. Many thanks! Julia

      Julia Kitson - 3rd March 2021

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  • Delivery & Returns


    Free UK Delivery over £40

    Free standard UK delivery is automatically applied at the checkout when you spend £40.

    Standard 2nd class (Tracked): £2.50

    Allow 4-10 working days (Monday - Friday) for delivery; no deliveries on Saturdays

    1st class (Tracked): £3.95

    Allow 1-3 working days (Monday - Friday) for delivery; no deliveries on Saturdays

    Express Next Day (Tracked): £6.50

    Order before 2pm for guaranteed next working day delivery to most of the UK*. Orders placed on Friday will be delivered on Monday (next working day). Requires signature.
    *Express delivery may exclude the Channel Islands, Herm Island, Isle of Man, Isle of Wight, Northern Irish postcodes BT18 & upwards, Sark, Scottish borders and offshore and a small number of remote mainland destinations as determined by our delivery courier. 

    Good to know

    • We'll send you an email to confirm once your parcel has been dispatched.
    • For delivery queries, please call us on +44 (0)1264 339 770 or email
    • Orders placed before 2pm will be dispatched on the same working day.
    • Delivery within the UK and Northern Ireland has a fixed price, regardless of the size and weight of your order. 
    • Delivery times are estimates and not guaranteed unless otherwise stated.



    International Delivery

    We offer an excellent worldwide delivery service. For more details, please take a look at our delivery FAQ.

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