For daily immunity

30 capsules



(ex. tax)
4.5/5 (24 reviews) Read the product reviews

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Free standard delivery on orders over $100

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Suitable for





Gluten free

Gluten free

During pregnancy

During pregnancy

Dairy free

Dairy free

GMO free

GMO free

See full ingredients list


Optibac Probiotics 'For daily immunity' is a high quality probiotic supplement with added vitamin C to help support a healthy gut and immune system*. Contains 5 billion CFU of Lactobacillus paracasei CASEI 431®a premium strain researched in thousands of people and found to help support immune function*. 70% of the immune system lives in the gut so it's key to support gut health with the right strains when trying to improve immune health*.

for daily immunity press


Probiotic Strains

  • Lactobacillus paracasei CASEI 431®
  • Vitamin C
  • Product Description

  • How To Use

  • Ingredients

  • Help & Advice

  • Reviews

  • Delivery & Returns

  • Product Description

    Who is 'Optibac Probiotics For daily immunity' for​?

    For anyone who tends to suffer from poor immune health, and who is looking for a daily friendly bacteria supplement with vitamin C to help support immune function and digestion*. 

    Key benefits

    • Each capsule provides 5 billion probiotic cultures and 80mg of vitamin C. The billions count is guaranteed until end of expiry.
    • Contains the well-researched probiotic strain Lactobacillus paracasei CASEI 431® which has been clinically trialed in thousands of people in over 20 clinical trials.
    • Scientifically proven to survive through stomach acidity and reach the gut alive.
    • Contains added vitamin C, also helping to support a healthy immune system*. 
    • Suitable for all from 1 year onwards, including women during pregnancy, breastfeeding mothers, vegans and vegetarians.
    • Gluten free for those with coeliac disease or an intolerance.
    • Dairy free
    • Sugar free
    • GMO-free
    • Free from artificial flavorings or colorings that may be found in other food & drinks containing probiotics.
    • Recommended for daily use, ideally with breakfast. 
    • Easy to take on the go – no refrigeration required. Capsule can be opened and contents taken alone.
    • Available to order in one pack size of 30 capsules.
    • From the UK’s most trusted & recommended brand of friendly bacteria supplements. As determined in an independent survey of 1000 British women+

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



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

  • How To Use

    Instructions for use

    'For daily immunity' can be given to adults and children, from 1 year onwards, with the following recommendations:

    • Take 1 capsule daily, preferably with breakfast, or as professionally directed.
    • Drink plenty of water with your course of live cultures.
    • For anyone unable to swallow capsules, the content of the capsule may be mixed with a cold, non acidic meal or beverage.

    Food supplements should not be used as a substitute for a healthy diet and lifestyle. Those with serious medical conditions should consult their doctor before use. Optibac will not cause dependency, and may be used on an ongoing basis.


    Like the rest of the Optibac range, 'For daily immunity' does not require refrigeration. Store in a cool, dry place below 25°C and out of direct sunlight.


    Probiotics 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, infants with short bowel syndrome, or patients with open wounds following major surgery; unless under a doctor's care.



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

  • Ingredients

    Ingredients for daily immunity supplement fact panel

    • Vitamin C (80mg, 100% ECNRV*)
    • Stabilizer: maltodextrin (natural source); anti-caking agent: vegetable magnesium stearate
    • Vegetarian capsule: hydroxypropyl methylcellulose
    • Live probiotic cultures: Lactobacillus paracasei CASEI 431®

    Each capsule guarantees 5 billion micro-organisms.

    Suitable for vegetarian and vegan diets.

    Suitable during pregnancy and during breastfeeding.

    * EC Nutrient Reference Value.

    Following the taxonomic updates published in April 2020 which are intended to be adopted globally, this strain may now also be referred to as Lacticaseibacillus paracasei subsp. paracasei CASEI-431.



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

  • Help & Advice

    Talk to our experts

    If you have a specific question or need some advice on which product to choose please email or click on the link below for our contact form

    Need help choosing a product?
  • Reviews

    Customer reviews

    • A huge thank you to OptiBac Advisor and Nutritionist Claire Foss for all her support and guidance around my digestive health and OptiBac products. Very happy to say that the gentleness of OptiBac Immunity is working well after a few weeks after many other brands did not agree my digestive system. The secret is trying different products, give them a few weeks each. I know you're eager to reduce your symptoms, but issues like this can take some time to resolve... keep going, and thanks again to Claire for her help.

      Joe - 25th May 2021

    • My wife bought this for us last year and we've both been taking it ever since. So far so good - we're feeling well, good energy and regular in the gut health department!

      Will B. - 4th January 2021

    • Does what it says on the tin! My wife and I both take one of these a day - have been for years but especially now it feels like a good way to keep safe. We've hardly had a cold since we found this in our local health food shop. Highly recommend.

      Joe Rawlings - 25th September 2020

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  • Delivery & Returns

    USA Shipping

    Coronavirus Update

    We ship all USA orders from our warehouse in Hampshire in the UK. Due to the ongoing global pandemic many US, European and Worldwide postal routes are seeing increased transit times. Delivery times provided on this site are therefore a guide and not a guarantee. Express Services largely remain unaffected however these routes are typically subject to local tax and duties at customs.

    USA standard shipping: $4.99

    International postal order - typically delivered within 4-10 working days.
    Free standard shipping on orders over $100.

    USA express shipping: $6.99

    We use DHL and orders are typically delivered within 1-3 working days.



    Good to know

    • We'll send you an email to confirm once your parcel has been dispatched.
    • For delivery queries, please email
    • We are unable to ship orders to PO boxes.
    • Product prices on this website are always shown in US dollars (USD $) and exclude tax - tax is not applicable as orders are fulfilled from the UK.

    Worldwide Delivery

    • We deliver to more than 50 countries.
    • Shipping is charged at cost - please note that duties may apply.
    • Please allow 3-7 working days for delivery within Europe and 5-12 days to all other destinations. Includes order tracking.  
    • If you are located within the United Kingdom or Europe, we recommended switching to our UK website.
    • International deliveries might currently take a little longer due to the global coronavirus situation. Please refer to the webpage of our international delivery provider DHL to confirm the number of days it takes to receive your order and whether they currently ship to your country.
    • Most international delivery prices are dependent on the size and weight of your order and where it is being sent. You'll be shown the final price of shipping in the checkout, before payment, once we have your address and order details.
    • Long distance shipping and short-term exposure to high temperatures will not compromise the viability of our products. Customers living in very hot countries should store the products out of direct sunlight and refrigerate if the option is available.

    For more details regarding international orders, currency conversion and applicable tax for orders outside the USA, please take a look at our delivery FAQ.

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