Supplement for your Immune & Digestive System

Course Length:

Subscribe & Save

  • Save every order
  • Provides daily consistency for lasting support
  • Free UK delivery for every order and reorder
  • Delay, pause, skip or cancel anytime
Save

What is it?

Did you know that children catch an average of 5-8 colds per year, with adults averaging 2-3 colds each year?

SMART STRAINS[sup]®[/sup] for your immune system has been specially formulated with scientifically proven live bacterial strains Lactobacillus rhamnosus, LGG[sup]®[/sup] - the world’s most documented bacterial strain - and Bifidobacterium lactis, BB-12[sup]®[/sup] - the world’s most published Bifidobacterium strain – scientifically proven to support the upper respiratory tract during the winter months.

Also includes vitamin D[sub]3[/sub], which contributes to the normal function of the immune system. The NHS recommends that children and adults above 4 years take a daily supplement of 10μg vitamin D[sub]3[/sub] during the winter months, and all year long for babies and children up to 4 years.

Each sachet provides 20 billion live bacteria and 10μg vitamin D[sub]3[/sub], and its powder format was specially selected to deliver SMART STRAINS[sup]®[/sup] directly into the mouth & throat.

Why choose SMART STRAINS?

Probiotic science has evolved, and SMART STRAINS® is leading
the live bacteria revolution. Formulated by The Gut Health Doctor®, SMART STRAINS® is a family of targeted live bacteria supplements using evidence-based live bacterial strains, which are backed by international health bodies.

The notion that all live bacteria have similar effects, and that you should take one daily for your health is outdated. Each type of bacteria, known as a ‘strain’,serves a unique purpose, and works best when taken in the right dose and format, to make a meaningful difference.

Just as you wouldn’t take an iron supplement for a vitamin D deficiency, the latest gut microbiome science tells us how important it is to get specific - we should be taking the right strain, at the right time, in the right way.

Who is it for?

Take daily to support your immune system, especially throughout the winter months. Suitable for infants, children and adults.

SMART STRAINS[sup]®[/sup] for your immune system is dairy & gluten free, and contains no added sugars, sweeteners, flavours, emulsifiers or preservatives.

How to take?

1 sachet per day provides the recommended 20 billion live LGG® and BB-12® + 10μg vitamin D[sub]3[/sub]. To take, open the sachet, sprinkle directly onto tongue, or mix into water, cold food or non-fizzy drinks. Consume immediately. Preferably take with food.

What's in it?

Ingredients per sachet - 20 billion live bacteria (20x10[sup]9[/sup]): Fructooligosaccharide fibre, Lactobacillus rhamnosus, LGG®, Bifidobacterium lactis, BB-12®, vitamin D[sub]3[/sub] (10μg, 100% Reference Intake).

Delivery and returns

Get free Royal Mail tracked 24-hour delivery on all orders over £30.

For orders below £30, you can choose between Royal Mail tracked 48 (for an additional £2.99) or Royal Mail tracked 24 (£3.99).

Monday - Friday same day dispatch on orders placed before 1pm. Saturday same day dispatch on orders placed before 11am. Any orders placed after these times will be dispatched on the following weekday.

Currently we are only able to deliver across the UK and its territories. But please register your interest and we’ll let you know as soon as international shipping is available.

Standard delivery times are:
Royal Mail Tracked 48 - 2-3 working days (subject to Royal Mail Terms and conditions)
Royal Mail Tracked 24 - The next working day (subject to Royal Mail Terms and conditions)

We are unable to guarantee these delivery times, and they may differ depending on the time of the year (see here for more information)

When your immune system is under pressure, everything feels a little harder. 


Targeted daily support with live bacteria LGG®, BB-12® & Vitamin D3 – scientifically formulated to support your immune & digestive system through every season.

Dr Megan Rossi offering a pack of SMART STRAINS for your immune system to you
Image of whole family suffering from cold or flu
Pouring SMART STRAINS for your immune system sachet into water

How SMART STRAINS® works

Specially designed with the science in mind

  • The Right Strain

    Lactobacilus rhamnosus, LGG[sup]®[/sup]
    Bifidobacterium lactis, BB-12[sup]®[/sup]
    Scientifically proven to support the upper respiratory tract during the winter months, and recommended by Cochrane Library on probiotics.

  • The Right Time

    Take daily when your immune system needs support, especially during the winter months. Suitable for infants, children and adults.

  • The Right Way

    Powder formulation specifically designed to target the nose and throat.
    Directions: Open sachet, sprinkle directly onto tongue, or mix into water, cold food or non-fizzy drinks. Consume immediately, preferably take with food.
    Dosage: 1 sachet per day, provides the recommended 20 billion live LGG® and BB-12® + lOµg vitamin D3.

Read the Science

We're not like other live bacteria supplements for the immune system. Here's why.

    SMART STRAINS[sup]®[/sup] for your Immune & Digestive System

    Powder format designed to start working in the mouth and throat
    Based on the latest scientifc review from the world-leading Cochrane Library
    Contains the world's most scientifically studied strains, LGG[sup]®[/sup] and BB-12[sup]®[/sup]
    Formulated by a leading scientist with an award-winning PhD in probiotics
    Contains 100% daily Reference Intake for vitamin D[sub]3[/sub] , as recommended by the NHS, to support the immune system
    No added sugars, sweeteners, emulsifiers, bulking agents, flavours or preservatives
    Suitable for all ages

    Other immune probiotic brands

    Powder format designed to start working in the mouth and throat
    Based on the latest scientifc review from the world-leading Cochrane Library
    Contains the world's most scientifically studied strains, LGG[sup]®[/sup] and BB-12[sup]®[/sup]
    Formulated by a leading scientist with an award-winning PhD in probiotics
    Contains 100% daily Reference Intake for vitamin D[sub]3[/sub] , as recommended by the NHS, to support the immune system
    No added sugars, sweeteners, emulsifiers, bulking agents, flavours or preservatives
    Suitable for all ages

70

%

of regular users of live bacterial supplements find it difficult to choose the right supplement

60

%

of people do not check the specific bacterial strains they are buying

51

%

are unaware that different probiotic strains treat different conditions

We’re Credible.

We’re Trusted.

We’re Trailblazers.

If you’re confused about live bacterial supplements, you’re not alone. That’s where SMART STRAINS® steps in. We’re here to the bring clarity and education.[sup]1[/sup]

Read the Science

The Right Strain

The Right Time

The Right Way

Dr Megan Rossi The Gut Health Doctor

Formulated by Dr Megan Rossi The Gut Health Doctor®

The Gut Health Doctor®, Dr. Megan Rossi (PhD, RD) is a leading dietitian, nutritionist, and gut health authority with an award-winning PhD in probiotics. With SMART STRAINS®, she is revolutionising how people take live bacteria to care for them and their families, one strain at a time.

Read the Science

Customer Reviews

Don't just take our word for it, here's what customers are saying about SMART STRAINS®

Overall rating: 4.844156 / 5 from 77 reviews.

AI Generated Review Summary

Summary topics

Review topics: [].

Review highlights

Reviews

When nothing else helped. . . .

"I am amazed by this product! I have a couple of issues with my skin and bowels that have gone on for YEARS. I feel 70% better after just 9 days of taking the digestive and immune sachets. I can't wait to get to the 30 days and feel 100% better and if not, Il happily buy another 30 days. Thankyou Smart Strains!!!!!"

Zoe S. (5/5)

Hit with the kids and parents

"The kids love the morning ritual of having their smart strains powder. Its also been great with significantly reducing their sick days from daycare and school. So far my kids have avoided all the sicknesses that seem to constantly going around the school yard. It might be a coincidence, but I am crediting smart strains for this."

Timothy (5/5)

Easy to open the little

"Easy to open the little packets, tastes neutral, no after-effects. I generally feel lots better after suffering from a series of viruses and hope to stay healthy on Smart Strains (immune)."

Joy P. (5/5)

Can enjoy grandson cuddles

"My 3 year old grandson seems to be always catching colds from nursery. I started taking Smart Strains to help with my immune system so I could enjoy his cuddles. I can say thanks to Smart Strains my immune system is much improved."

Tina (5/5)

Great all year round

"This Smart Strain is a game changer, I have been taking it for a few months now and at one point I felt like I was getting sick and within a day nothing came of it. I out it down to Smart Strains."

Renee (5/5)

The best live bacteria! Already

"The best live bacteria! Already bought for the fourth time in a row. Highly recommended"

Maria B. (5/5)

Package was delivered quickly, thanks!

"Package was delivered quickly, thanks! And the supplement is easy to take and tastes nice. Will definitely order again"

Peter B. (5/5)

My absolute go-to

"I always get ill on holiday (it must be the planes!) but for the first time I'm cold free! Didn't catch one on the way home either. I'm delighted, won't be without it now."

Sam (5/5)

Saved me during stressful patch

"Highly recommend - I usually get sick when work stress escalates, so took these and have managed to stay well."

Harry (5/5)

Just brilliant! I started taking

"Just brilliant! I started taking following a bout of holiday tummy but it seems to have also improved my ongoing gut problems due to diverticulitis. Just wish I’d found it sooner ☺️"

Jane G. (5/5)

Q&A

You May Also Like...

Our range of scientifically-proven formulations are targeted at specific everyday needs that affect every member of the family. From immune support to fussy babies, our range provides the right strain, at the right time, in the right way to care for you and your family.

References

1. Data on File. January 2025. Opinium Research - Independent Survey of 2000 people reflective of the UK population