Not every gut situation calls for the same potency. For daily maintenance, 4 billion CFU across 8 strains does the job. But after a course of antibiotics, food poisoning, or serious travel disruption, the microbiome can shed a large share of its diversity in days. BioTic 20 Billion delivers 20 billion viable organisms per capsule — five times our maintenance formula — across 8 human-compatible strains that are bile and acid tolerant with high adherence ability.
When to Choose High Strength Over Standard
The CFU debate is more nuanced than the marketing suggests. Higher CFU doesn't automatically mean better outcomes for everyday maintenance — strain selection and acid-bile tolerance matter just as much. But for restoration, CFU counts, because gut colonisation is competitive: beneficial bacteria need to outnumber and displace dysbiotic organisms. After antibiotics or illness you start from a compromised balance, and a high strength probiotic raises the daily inoculation dose.
A Cochrane systematic review found probiotics reduced antibiotic-associated diarrhoea by 60% compared to placebo, with higher-potency formulas showing stronger effect sizes across several individual trials.
How Other UK Probiotic Capsules Compare
Optibac For Every Day EXTRA Strength — 20 billion CFU, good strains, not halal. One of the better high strength probiotics on the UK market: well-researched strains, good acid tolerance. No halal certification. BioTic 20 Billion matches the CFU and strain count, with halal and kosher approval.
Symprove — liquid format, expensive, no halal. Symprove delivers bacteria in a water-based medium rather than capsules. The mechanism is genuinely interesting, but it needs refrigeration, costs far more per CFU, and holds no halal certification.
Biokult — good strains, not halal. A well-regarded multi-strain probiotic with a strong track record. No halal or kosher certification, where BioTic 20 Billion carries both.
The 8 Live Culture Strains
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Lactobacillus rhamnosus · among the most studied probiotic strains worldwide · robust acid and bile tolerance · strong evidence for traveller's diarrhoea and antibiotic-associated diarrhoea
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Lactobacillus casei · anti-inflammatory properties in the gut · widely studied for IBS symptom management
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Lactobacillus acidophilus · small intestine coloniser · produces lactic acid and bacteriocins · the most research-backed Lactobacillus for general gut and urogenital health
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Bifidobacterium infantis · among the first species to colonise the infant gut and a key adult bifid strain · extensively studied for IBS symptom relief and intestinal barrier support
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Streptococcus thermophilus · lactase producer · improves dairy tolerance · helps other strains colonise the colon
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Bifidobacterium breve · studied specifically in antibiotic-associated recovery protocols · broad fermentation capacity
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Bifidobacterium longum · large intestine coloniser · the dominant bifid species in adults · bowel health, transit time and gut-brain axis function
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Lactobacillus bulgaricus · classic yoghurt culture · works with S. thermophilus to produce lactic acid and support colonisation by other strains
20 billion viable organisms per capsule · 30 capsules · bile and acid tolerant with high adherence ability · no need to refrigerate · ideal for travel. Ingredients: capsule shell (HPMC), brown rice flour, bio-live bacteria blend, rice extract. Suitable for vegetarians and vegans. Halal approved. Kosher approved. No added dairy, sugars, artificial flavourings or colourings.
Allergy advice: manufactured in a facility that also handles nuts, wheat, soy, dairy and other common allergens. Check the pot label for the full allergen statement.
Every capsule is: ✓ 20 billion CFU · ✓ 8 strains · ✓ Vegan · ✓ Halal & kosher · ✓ No refrigeration · ✓ Ideal for travel
BioTic 20 Billion vs Other High Strength Probiotics
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BioTic 20 Billion BioBodyBoost · 30 caps
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Optibac Extra Strength ~£22.99
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Symprove ~£79/month
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| CFU per capsule/dose |
20bn ✓ |
20bn |
10bn ✗ |
| Halal & kosher approved |
✓ Both |
✗ No |
✗ No |
| Suitable for vegans |
✓ Yes |
Varies |
Varies |
| No refrigeration |
✓ Shelf-stable |
✓ Yes |
✗ Refrigerate |
| Price per 30 caps |
£19.99 ✓ |
£22.99 ✗ |
£79 ✗ |
Based on publicly available product information. Prices approximate. Always verify current specs on manufacturer websites.
How to Take Your Probiotic Capsules
Take 1 capsule, one to three times per day, before meals, or as advised. During an antibiotic course, take it at least 2 hours away from your antibiotic dose, and keep going for 4–8 weeks after the course finishes. For post-illness or travel recovery, run it intensively for 4 weeks then step down to BioTic 4 Billion for ongoing maintenance.
Alongside antibiotics, pair it with SaccharoMyTum — the yeast probiotic S. boulardii is naturally antibiotic-resistant, so the two can be taken together.
Is This You?
- You've just finished or are part-way through a course of antibiotics and want intensive CFU support
- You need halal and kosher approved probiotic capsules at 20 billion CFU — Optibac, Biokult and Symprove carry neither
- You've had food poisoning, gastroenteritis or heavy travel disruption and want to speed up microbiome recovery
- You travel often and want a shelf-stable probiotic that doesn't need refrigerating
- You're vegan and want a high strength probiotic that suits a plant-based diet
Explore the full Gut Health UK and Halal Vitamins UK collections.
Questions We Get Asked
Should I take probiotics during or after antibiotics?
Both. Start BioTic 20 Billion on day one of your antibiotic course, keeping each dose at least 2 hours apart from the antibiotic itself. The antibiotic will knock back the viability of some strains, but daily reinoculation helps preserve flora continuity and meaningfully reduces antibiotic-associated diarrhoea. Once the course ends, carry on for 4–8 weeks — that post-course window is when repopulation matters most.
When should I switch from 20 billion to 4 billion CFU?
Once your intensive phase is done — typically 4–8 weeks after antibiotics or illness — move to BioTic 4 Billion for ongoing daily maintenance. Staying at 20 billion CFU indefinitely isn't necessary once the microbiome has recovered. Think of BioTic 20 Billion as the restoration tool and BioTic 4 Billion as the upkeep tool.
Do these probiotic capsules need refrigeration?
No. The strains are bile and acid tolerant with high adherence ability, and the product is shelf-stable, which makes it ideal for travel. Store somewhere cool and dry, away from heat and direct sunlight.
Is it suitable for vegans?
Yes — the supplier states BioTic 20 Billion is suitable for vegetarians and vegans, with an HPMC plant capsule rather than gelatine, and no added dairy. It is also halal and kosher approved. If you have a diagnosed milk or soya allergy, check the pot label before use, as with any supplement.
Can I take this alongside SaccharoMyTum?
SaccharoMyTum supplies Saccharomyces boulardii — a probiotic yeast that, unlike bacteria, is naturally resistant to antibiotics. Combining it with BioTic 20 Billion during a course gives you antibiotic-resistant yeast protection at the same time as bacterial reinoculation.
Food supplements should not replace a varied diet or healthy lifestyle. Take at least 2 hours apart from antibiotics. Consult your GP before use if pregnant, breastfeeding, immunocompromised, or managing a diagnosed gut condition.