Written by the Plenthera team (orthomolecularly trained). Scientifically reviewed in April 2026. Last updated: April 30, 2026.
Probiotics — literally "for life" — are living microorganisms that, when ingested in sufficient numbers, can have a beneficial effect on the gut flora. At Plenthera, you'll find premium probiotics in all relevant forms: multi-strain formulas for broad support, targeted single-strain products for specific goals, and high-CFU capsules for after an antibiotic course or intensive travel. Gastric acid resistant and standardized for guaranteed live cells until the end of the shelf life.
Which probiotics are right for you?
| Purpose | Form | CFU per day |
|---|---|---|
| Daily maintenance | Multi-strain | 5-25 billion |
| After antibiotic course | High-CFU + S. boulardii | 50-100 billion |
| Travel | S. boulardii or L. plantarum 299v | 5-25 billion |
| Women's flora | L. rhamnosus GR-1 / L. reuteri RC-14 | 5-10 billion |
| Children | Child formula (powder/drop) | Adjusted |
What are probiotics?
Probiotics are living microorganisms that, when ingested in sufficient numbers, can have a beneficial effect. The most commonly used strains belong to the genera Lactobacillus, Bifidobacterium, and Saccharomyces (yeast). They are measured in CFU (Colony Forming Units).
The human gut hosts an ecosystem of an estimated 100 trillion microorganisms — more cells than the human body itself contains. This microbiome plays a role in digestion, immune function, vitamin production (especially vitamin K and some B vitamins), and the gut-brain axis. A balanced gut flora is associated with overall well-being; disruptions (due to antibiotics, unhealthy diet, stress, illness) can unbalance the ecosystem.
Probiotic supplements deliver specific strains of live bacteria in high numbers. The assumption is that these bacteria reach the gut, temporarily colonize there, and exert their beneficial effects. Important: probiotics usually do not colonize permanently — after stopping, they gradually disappear from the gut flora.
A point of attention: the world of probiotics is strain-specific. It is not enough to see "Lactobacillus rhamnosus" on a label — the specific strain (such as L. rhamnosus GG) is what has been clinically studied for specific effects. Two strains within the same species can work very differently. Also check our bone broth category and our amino acids category (glutamine) for the broader gut cluster.
Science, EFSA, and strain-specificity
Probiotics are one of the most researched classes of dietary supplements — thousands of clinical studies, especially around gastrointestinal effects, antibiotic-associated diarrhea, traveler's diarrhea, and women's flora. The evidence for some strains in specific applications is quite strong.
Important: despite extensive research, EFSA has not yet approved any health claims for probiotics. EFSA applies strict criteria that prove difficult to meet with probiotics (specific strain, specific dosage, specific outcome). The European practice is therefore that we are legally not allowed to make literal claims about what probiotics "do" — only to describe which strains exist, in what numbers, and in which research lines they are studied.
We do not make literal claims about the efficacy of probiotics. Probiotics are food supplements, not medicines. For serious medical conditions or medication use (especially immunosuppressants): consult a doctor or pharmacist beforehand.
CFU, strain-specificity, and gastric acid protection — what really matters?
CFU (Colony Forming Units): The number of live bacteria per serving. Products typically provide 1-100 billion CFU. Higher is not automatically better — what matters is whether the given dose matches the strain used in clinical research.
Strain-specificity: L. rhamnosus GG and L. rhamnosus GR-1 are both L. rhamnosus, but have very different applications in research. Good products specify the particular strain (often with a letter/number code).
Gastric acid protection: Many bacteria die in the stomach (pH ~2). Enteric coating, gastric acid-resistant capsules, or encapsulation techniques ensure that the bacteria reach the gut alive.
Shelf-life CFU: The CFU count on the label should be guaranteed until the expiry date, not just at the time of production. Good brands over-guarantee to compensate for loss during transport and storage.
Refrigeration: Not all probiotics require refrigeration. Modern freeze-drying + matrix techniques make many formulas room temperature stable. Read the label.
Plenthera's probiotic forms
Multi-strain daily (5-25 billion CFU)
Combination of 4-12 strains of Lactobacillus and Bifidobacterium. For general daily gut support. Our first-line for those starting without a specific goal.
High-CFU (50-100 billion) after antibiotics
Concentrated formulas for periods after an antibiotic course or during intensive disruption. Typically a 14-30 day course.
Saccharomyces boulardii
Yeast (not bacteria) — particularly relevant after antibiotics because antibiotics do not affect yeast. Clinically well-researched for traveler's diarrhea and post-antibiotic issues.
Women-specific probiotics
Strains such as L. rhamnosus GR-1 and L. reuteri RC-14 that have been specifically studied for women's flora.
Children's probiotics
Adapted dosages and strains for children. Often in powder form for mixing into milk or food.
Travel probiotics (S. boulardii or L. plantarum 299v)
For traveler's diarrhea theme. Start 5-7 days before departure and continue during travel.
How to use probiotics?
Simple basic approach to probiotics:
- Determine your goal: daily maintenance, after antibiotics, travel, women's flora, child.
- Choose a formula with clinically researched strains that suit your goal.
- Start with the recommended daily dosage — no need to dose higher at the beginning.
- Timing: morning on an empty stomach or with a light meal. For some brands: specific advice on the label.
- When using antibiotics: at least 2 hours between antibiotics and probiotics. Continue for 1-2 weeks after the antibiotic course.
- When traveling: start 5-7 days before departure, continue during and after the trip.
- Give it at least 2-4 weeks for a fair assessment.
- For serious medical conditions or immunosuppression: consult a doctor beforehand.
Myths and misconceptions about probiotics
Myth 1: "The more CFUs, the better the probiotic."
Not automatically. The effect is strain-specific and dose-specific. 50 billion CFUs of an under-optimized strain does less than 5 billion of a clinically well-researched strain.
Myth 2: "Yogurt provides as many probiotics as a supplement."
Yogurt typically contains 10-100 million live bacteria per gram — a 200g serving provides 2-20 billion CFU. A good supplement provides 5-50 billion CFU in one capsule. Yogurt is a food, not a substitute for targeted probiotics.
Myth 3: "Probiotics permanently colonize your gut."
Incorrect. Studies show that probiotics are usually temporarily present — after stopping, they gradually disappear. Therefore, long-term daily use is common if you want to maintain the effect.
Myth 4: "All probiotics work for all problems."
Strain-specificity means they are not interchangeable. L. rhamnosus GG for traveler's diarrhea does not mean it also works for women's flora — other strains have been studied for that.
Combining probiotics with other supplements
Probiotics often work in conjunction with other supplements for broad gut and immune support. Commonly chosen combinations:
- Prebiotics (FOS, GOS, inulin): food for probiotics and native flora — a symbiotic combination. Often in the same formula.
- Amino acids (L-glutamine): fuel for intestinal wall cells.
- Bone broth: provides collagen, glycine, glutamine, and minerals.
- Vitamin D: involved in the gut-immune axis.
- Zinc: for immune and gut wall integrity.
- Fibers and whole food approach: probiotics work best in a diet with sufficient fiber.
Frequently Asked Questions
What are probiotics?
Live microorganisms that, when ingested in sufficient numbers, can have a beneficial effect. Especially Lactobacillus, Bifidobacterium, and Saccharomyces.
How many CFUs per day?
General: 1-25 billion. After antibiotics: 50-100 billion. Strain and dosage from research are more important than total CFUs.
Which probiotics are best?
Strain- and goal-dependent. Multi-strain for general use, S. boulardii for antibiotics/travel, women's strains for flora.
What is the difference between probiotics and prebiotics?
Probiotics: living bacteria. Prebiotics: dietary fibers that serve as food for native flora. Symbiotics = both combined.
When to take probiotics?
In the morning on an empty stomach or with a light meal. With antibiotics: at least 2 hours between doses.
Probiotics and antibiotics — how to combine?
2 hours between antibiotics and probiotics. Continue for 1-2 weeks after the course.
Do probiotics help with gastrointestinal complaints?
Research indicates effects for specific conditions (antibiotic-associated diarrhea, traveler's diarrhea). EFSA claims do not exist — we do not make literal claims.
Do I need probiotics?
For general health: not automatically. In specific situations (after antibiotics, travel, intestinal disruption): supplementation can be useful.
Do probiotics need to be refrigerated?
Not always. Modern formulas are often room temperature stable. Read the label.
What is a good probiotic for travel?
S. boulardii or L. plantarum 299v have been clinically studied. Start 5-7 days before departure.
Sources
- Hill C. et al., "The International Scientific Association for Probiotics and Prebiotics consensus statement on the scope and appropriate use of the term probiotic", Nat Rev Gastroenterol Hepatol (2014).
- Hempel S. et al., "Probiotics for the prevention and treatment of antibiotic-associated diarrhea", JAMA (2012).
- Reid G. et al., "Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14: Use of cervicovaginal probiotic strains in women", FEMS Immunol Med Microbiol (2003).
- EFSA — Probiotics and Prebiotics scientific opinions (no specific claims approved).
Disclaimer: This text is intended for informational purposes only and does not replace medical advice. Probiotics are food supplements, not medicines. In case of doubt or if taking medication, we recommend consulting a doctor or orthomolecular therapist first.