Probiotics are live micro-organisms, often called friendly bacteria, that may offer health benefits when taken in sufficient amounts. Some probiotic strains may support digestive health, including helping to prevent or manage certain types of diarrhoea. If you’re looking for the best probiotics for gut health, it’s worth remembering that benefits can vary by strain and product.
Taking probiotics may also support the immune system, although the effects depend on the strain. While diet plays a central role in fostering a healthy gut – think fibre-rich plant foods and fermented options like kimchi or kefir – there may be moments when a probiotic supplement could be a useful addition to your routine.
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If you’re considering supplementation, we – with the help of an expert nutritionist – have tested a variety of probiotic products to determine the best for quality, effectiveness and value.
Read on to discover the top probiotic supplements to support your gut health which includes some of our favourites for 2026, Natures Zest Biocultures Powder and the highly rated Smart Strains For Your Immune System. The potency of probiotics is measured in colony-forming units (CFU). Find out more about probiotics and what they do.
Best probiotic supplements at a glance
- Best probiotics for gut health: Vitabright Advanced Bio-Cultures, £19.99
- Best probiotics to take with antibiotics: Smart Strains For When You’re on Antibiotics, £16.49
- Best vegan probiotics: DR.VEGAN Gut Works, £32.99
- Best high-strength probiotic: Prowise Healthcare Pro Bio Cultures Complex, £14.99
- Best probiotic with zinc: Heights Biotic+, £45
- Best probiotic blend: FutureYou Cambridge ProBio 8+, £28.75
- Best probiotic with live cultures: Vitabiotics Probiotics Extra Strength Live Cultures, £26.95
- Best probiotic powder with prebiotics: Nature’s Zest Biocultures Powder, £19.95
- Best probiotic for diverse strains: Swallow Probiotic Live Cultures, £35
- Best probiotic for targeted gut support: Inessa Advanced Biotic Complex, £38.99
- Best probiotic with postbiotic: Ancient + Brave True Biome, £36
- Best researched probiotic: ProVen BioForm, £31.99
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How we tested probiotic supplements
All supplements were tested within the same time period, with observations recorded based on the testing criteria. We included samples from various manufacturers, offering diverse formats such as capsules, gummies and liquids, with a range of price points to suit different budgets. The key areas we assessed were:
- Taste and flavour: are they pleasant to consume?
- Active ingredients: what are the different species of probiotic and are details of the strain included? What is the potency (CFU) of the individual bacteria? Are there details regarding the expiry date?
- Formulation: Does the product include a prebiotic? And has it been formulated to deliver the probiotics to the part of the gut where they are needed?
- Dietary requirements: does the product meet any specific dietary needs – is it vegetarian, vegan, gluten-free?
- Value for money: how does it compare to other products on a cost-per-day basis?
- Clarity of instructions: are storage details and how to take the product clearly described?
Best probiotics to buy in 2026
Vitabright Advanced Bio-Cultures
Available from Vitabright (£19.99), Amazon (£16.99)
Best probiotic for gut health
Price per day: 63p
Star rating: 5/5
Offering a 100 per cent money-back guarantee, this product ticked most of our boxes, with 17 different species, 11 of which are at amounts above 1bn CFU (there are 45bn CFU in total). However, there are no details of the exact strains of bacteria used in the product. An enteric-coated capsule offers protection against stomach acid, and inulin acts as a food source to support the gut-friendly bacteria. Vegan and gluten-free.
Available from:
Smart Strains For When You’re On Antibiotics
Available from Boots (£16.49)
Best probiotics to take with antibiotics
Price per day: 82p
Star rating: 5/5
Taking antibiotics can wreak havoc on your gut, so it’s wise to give your body extra support. Testers were impressed that these probiotics had been thoughtfully created to do just that. Each capsule provides 10 billion live Lactobacillus rhamnosus and should be taken daily from the first antibiotic treatment, and continue for seven days after treatment has ended. Suitable from four years of age.
Available from:
Dr Vegan Gut Works
Available from Amazon (£22.99), Dr Vegan (£32.99)
Best vegan probiotics
Price per day: 97p
Star rating: 5/5
Easy to take and featuring a neutral flavour with no noticeable smell, this Dr Vegan probiotic supplement offers a blend of six well-known probiotic strains, including Lactobacillus and Bifidobacterium species, alongside prebiotic inulin and psyllium husk. Each capsule delivers an impressive 50 billion CFU, which have a delayed release to help protect bacteria through the stomach. The formula is vegan, allergen-free and comes in a recyclable pouch. While claims reference clinical studies, more transparent evidence for the specific formulation would be reassuring. A 60-day money-back policy adds peace of mind.
Available from:
Prowise Healthcare Pro Bio Cultures Complex
Available from Prowise (£14.99), Holland & Barrett (£11.69)
Best high-strength probiotic
Price per day: 43p
Star rating: 4.5/5
Providing 50 billion CFU across 10 individually identified strains, this is one of the most detailed high-strength blends we tested. The two-capsule serving also contains 100mg inulin, 100mg L-glutamine and 40mg vitamin C, while the vegan capsules are made in the UK to GMP standards. The 60-capsule bottle lasts 30 days and costs around 43p per day at Holland & Barrett.
Strain-level labelling is a real strength, making it easier to see exactly what the blend contains rather than relying on a vague proprietary total. However, the brand does not state that the 50 billion CFU is guaranteed to expiry, and the capsules are not described as enteric-coated or delayed-release. Even so, the clearly named strains, strong daily dose and useful supporting ingredients make this a well-rounded high-strength option.
Available from:
Heights Biotic+
Available from Healf (£45)
Best probiotic with zinc
Price per day: £1.50
Star rating: 4.5/5
Each one-a-day capsule provides at least 20 billion CFU from seven live cultures, including Lactobacillus rhamnosus GG and Saccharomyces boulardii. Zinc is also included, which contributes to normal immune function and the maintenance of normal skin, hair and nails.
The vegan delayed-release capsule and protective culture matrix are designed to help the live cultures survive stomach acid and reach the colon. We liked the convenient one-capsule serving, clearly identified cultures and third-party testing, while the compact 30-capsule pack is easy to fit into a daily routine.
The main drawback is price: £45 for a 30-day supply makes this one of the more premium probiotics tested. The amount supplied by each culture is not disclosed, either. However, the 20 billion CFU dose, zinc and targeted delivery system help justify some of the extra cost.
Available from:
FutureYou Cambridge ProBio 8+
Available from QVC (£24.96)
Best probiotic blend
Price per day: £1.03
Star rating: 4.5/5
Eight individually identified bacterial strains and a pre-measured format make this one of the most transparent probiotic powders tested. Each vanilla-flavoured sachet provides three billion CFU alongside the brand’s Probioact blend of prebiotics, proteins and minerals, including FOS and inulin. It mixed well with no aftertaste into 100ml water, milk and yogurt with a very light flavour, and does not require refrigeration, making it particularly convenient for travel.
The CFU count is lower than many high-strength capsules, and the individual strain quantities are not disclosed. However, clear strain identifiers and a six-week observational study using the same blend add useful detail. The study included only 40 adults, so its findings should be interpreted cautiously. At £1.03 per day, it is relatively expensive, but the subscription price, portable sachets, satisfaction guarantee and straightforward once-daily directions help justify the premium.
Available from:
Available from Vitabiotics (£26.95)
Best probiotic with live cultures
Price per day: 90p
Star rating: 4.5/5
Each capsule provides 26 billion viable cells across seven individually identified strains. The four-strain Lab4 blend supplies 25 billion CFU, with a further one billion from three additional cultures. Vitabiotics also publishes the amount of every strain, offering much better transparency than products that disclose only a combined blend total.
Triphase technology is designed to protect culture levels for the product’s shelf life, so refrigeration is not required. The once-daily vegan capsule also contains 100mg inulin and 120mg calcium and can be opened into cold food or drink. Clear instructions are supplied for separating it from antibiotics, too. The 90p daily cost is relatively high and inulin may not suit those sensitive to FODMAPs. Independent finished-product testing and GMP certification are not confirmed, but the detailed strain breakdown, convenient serving and storage stability make this a strong Lab4 option.
Available from:
Natures Zest Biocultures Powder
Available from Natures Zest (£19.95), Amazon (£19.95)
Best probiotic powder with prebiotics
Price per day: 66p
Star rating: 5/5
Offering a high-strength probiotic in powder form, this product delivers 60 billion CFU per daily scoop across nine strains, with prebiotic fructooligosaccharides to support the growth of beneficial bacteria. It supports digestive health and overall gut balance. Suitable for vegans and gluten-free, made in the UK in a GMP-certified facility.
Available from:
Swallow Probiotic Live Cultures
Available from Swallow (£35)
Best probiotics for diverse strains
Price per day: £1
Star rating: 4.5/5
Plenty of reassurance is provided on the website and packaging about the quality of the ingredients, with third-party testing and well-researched strains highlighted. The updated formula has also picked up a Nourish Award, which adds to its credibility. With 16 different strains at a total of 35 billion CFU this made for a popular product with testers.
What makes it feel more complete is the added prebiotic fibre (inulin) and chromium, so it is not just bacteria on its own. The capsule is easy to take, completely neutral and designed to release further down in the gut. The trade-off is price and complexity. At £1 per day it is more expensive than simpler options and the higher potency and broader strain mix may be more than you need for everyday use.
Available from:
Inessa Advanced Daily Biotic
Available from Inessa (£19.99)
Best single-strain probiotic for targeted gut support
Price per capsule: 33p
Score: 4.5/5
Inessa is one of the easiest probiotics to stick with day to day and is a more focused take on probiotics. Instead of packing in multiple strains, this centres on lactobacillus rhamnosus GG, with 10 billion CFU per capsule. The capsules are small, completely neutral and do not need refrigeration, so it fits easily into a routine.
The addition of glutamine adds a bit more support without making the formula complicated. It does not try to do everything, so if you are looking for a broader multi-strain approach this may feel quite specific. But for something simple and consistent it works well.
Available from:
Ancient + Brave True Biome
Available from Ancient and Brave (from £36)
Best probiotic with postbiotic
Price per day: £1.28
Star rating: 4.5/5
This neutral-tasting powder blends smoothly into drinks or smoothies and is easy to add to a daily routine. It contains a single postbiotic strain, prebiotic fibre and L-glutamine to support the gut lining and microbiome balance without using live bacteria. The vegan formula comes in secure, clearly labelled packaging with a good shelf life. It’s a gentle, effective option for sensitive digestion, though those after live probiotics may prefer another product. We love that it’s available in either individual sachets as well as a glass jar.
Available from:
ProVen BioForm
Available from Pro-Ven Biotics (£31.99), BodyKind (£25.59)
Best researched probiotic
Price per day: £1.05
Star rating: 4.5/5
With 50bn CFU of ‘extensively researched’ microbes, this has one of the highest contents of the products we tested. However, although we are given the details of five different strains, there’s no detail of proportions.
Corn starch acts as a prebiotic, and an enteric coating protects against stomach acid, meaning there’s a good chance the bacteria will survive and establish themselves in the gut.
The capsules also include vitamins D3 and C, plus zinc. The packaging includes a claim they’re proven to support a ‘shapelier you’, but there’s no further explanation of how or what that means.
Vegetarian (not vegan), dairy- and gluten-free.
Available from:
Other probiotics tried and tested:
- Smart Strains For Your Immune System, 5/5, £26.49
- Healthspan Pro20 Biotic, 5/5, £48.99
- Epetome Synbiotic Duo Cap, 4.5/5, £54.99
- Zipvit Pro-Bio 20 Probiotic 20 Billion CFU, £5.99
- Thorne FloraMend Prime Probiotic, £45.57
- Garden of Life Microbiome Once Daily 10B, 4/5, £25.99
- ProVen Biotics ProVen Probiotics 25B, 4/5, £18.50
- Centrum Multibiotics Complete Multivitamin Supplement, 4/5, £21.99
- Symprove, 3.5/5, from £49.99
- The Gut Co Care, 3.5/5, £44
- Feel Daily Biotic: 3/5, £35.04
- Feel Beauty Probiotic+: 3/5, £35.04
- Vitl Daily Biotic: 3.5/5, £15
- JS Health Probiotic: 3.5/5, £21.99
How to choose a probiotic
When choosing a supplement check the label for the following information:
- A list of the species of bacteria included in the product. Are these appropriate for your needs (e.g. have they been assessed in clinical trials)? A good starting base is the inclusion of families such as Bifidobacterium and Lactobacillus.
- The number of colony-forming units (CFU) supplied by the product. The higher the number, the more active microbes per dose.
- Either the manufacture date or an expiration date. This is a useful guide to determine the potency of the product, because the number of live bacteria will reduce over the life of the product.
- Has the product been tested by a third party to confirm the CFU and potency?
- Does the product contain a fuel source (known as a prebiotic) to support the microbes? Check the ingredients label for accepted prebiotics which include inulin, fructooligosaccharides (FOS) and galactooligosaccharides (GOS). You may see these combination products (pro- and prebiotics) referred to as ‘synbiotics’.
- Has the product been designed to promote the safe delivery of the microbes to the small intestine and colon (where they are needed)? This may be thanks to an enteric coating on a capsule or the way a liquid product is taken, e.g. on an empty stomach.
If you have a specific dietary need, check the ingredients carefully, for example, not all products will be suitable for vegans because they may contain traces of dairy.
Which probiotic strain is best?
Look at the ingredients label to check the details – you’re likely to see the bacteria and/or yeast described as Bifidobacterium longum W11.
We read this is as follows:
- Bifidobacterium is the ‘genus’ or family name
- longum is the species, or type within that family group
- W11 is the specific strain.
The most common and effective probiotics that are included in a supplement are those of the Lactobacillus, Bifidobacterium and Streptococcus families as well as Bacillus. Outside of these four, you will need to do your own research.
If you want to verify whether the particular probiotic can help with a specific health need, check the relevant clinical studies and then ensure that the product you are considering contains the same strain, at the same potency that was evaluated in the trial.
How much should I take?
There are no official recommended daily doses or upper limits for probiotics, although most experts suggest a product should supply 1-10 billion CFU per dose; with multi-strain products potentially offering doses of 1-10 billion CFU for each strain. Taking high doses isn’t advised due to the risk of unwanted side effects such as bloating, wind and loose bowels or constipation.
For most people, probiotic supplementation is generally safe; however, those with certain gut disorders, compromised immune systems (including those on immune-suppressant medication), severe illness or allergies, as well as pregnant and breastfeeding women should seek advice from their GP prior to supplementing. Furthermore, if you are taking certain medications including antibiotics or anti-fungals, discuss the use of a probiotic supplement with your GP.
What format of probiotic is best?
This depends on a number of factors:
- The bacteria you choose
- How you wish to store the product
- Whether the formulation is designed to ensure the probiotics reach the part of the digestive system where they are needed.
Liquid and dairy-based products will likely need refrigerating and tend to be the least shelf-stable. Probiotics in solid form, such as capsules and powders, are more stable and can be stored for a longer period of time often under cool, dry conditions, such as in a cupboard.
Probiotics that are encapsulated in a hard capsule shell or ‘enteric’ coating stand a better chance of reaching the colon, while dairy-based foods and drinks that tend to stay in the stomach longer may result in more of the bacteria being lost. Studies suggest that suppositories, which avoid the stomach altogether, may deliver a greater proportion of viable probiotic, but these aren’t as commonly available over the counter.
How should I take a probiotic supplement?
Follow the instructions on the label, as how you should take the product will depend on the ingredients. Often the recommendation is to take on an empty stomach, to avoid it being held up in the digestive system. Most studies support taking once or twice a day for about 12 weeks.
When to start taking probiotics before travel
Travelling and going on holiday – particularly abroad – can have a noticeable impact on gut health and digestion. Changes in time zones, dietary habits, water sources and even increased stress levels can disrupt the balance of gut bacteria, sometimes resulting in digestive issues such as bloating, constipation or diarrhoea. Exposure to unfamiliar foods and environments may also increase the risk of gut upsets, including traveller’s diarrhoea.
Taking a probiotic supplement can help support digestive health during travel by helping to maintain a healthy balance of gut bacteria. An analysis of studies has found that the most effective probiotic strain for traveller’s diarrhoea is Saccharomyces boulardii CNCM I-745, so be sure to check your product contains this specific strain.
For best results, it is recommended to start taking a probiotic supplement at least a week before travel and continue throughout your trip. This gives the beneficial bacteria time to establish in your gut and offer protection during your travels.
We also reviewed Nutrigums (£9.99).
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