The short answer: Choose a probiotic by its strains rather than the size of its CFU count. Look for well-identified strains, a formula that includes prebiotics and postbiotics, packaging that keeps it stable until the last capsule, clear manufacturing standards, and a brand with a long track record.
Shelves are full of probiotics with big numbers on the label, and it's hard to tell them apart. This checklist shows what matters. If you'd rather skip the comparison, Dr. Ohhira's probiotic supplements tick every box below.
Are all probiotics the same?
No. Two products can both say "10 billion CFU" and do very different things. Benefits are linked to specific strains, the way they're made and whether they survive to reach the gut. That's why the label details matter more than the headline number.
1. Check the strains, not just the species
A strain is identified by three parts: genus, species and a strain code, for example Lactobacillus fermentum ME-3. Research is done on strains, so a full strain name tells you the product is based on something that has been studied. Multi-strain formulas can support the microbiome more broadly, but more strains isn't automatically better. Look for strains chosen to work together.
2. Look beyond the CFU count
CFU (colony-forming units) measures how many live microbes are in a dose. A higher number isn't always better. What matters is whether the dose of each strain matches what's been studied and whether those microbes are still alive when you take them. Check whether the CFU is guaranteed "at time of manufacture" or "through the best-before date".
3. Consider survivability
Probiotics have to get past stomach acid and bile to reach the gut. Fermented formulas, capsule design and taking them as directed all help more of them arrive where they're needed.
4. Look for prebiotics and postbiotics
- Prebiotics, such as FOS, feed beneficial bacteria.
- Postbiotics are the beneficial compounds, such as organic acids, created during fermentation.
A formula with probiotics, prebiotics and postbiotics works on several levels at once rather than relying on live bacteria alone.
5. Think about shelf stability
If a probiotic needs the fridge, it's easy to forget and hard to travel with, and heat can damage it. Shelf-stable probiotics in blister packs protect each capsule from air, light and moisture, so you can keep them in a bag, desk drawer or suitcase.
6. Check how it's made
Look for clear information about where and how the product is made, which ingredients it uses, and whether it's free from things you avoid, such as dairy, gluten, artificial colours or preservatives.
7. Choose a brand with a track record
A long history, published research and independent recognition, such as industry awards, are good signs. Buy from the brand or an authorised retailer so you know the product is genuine and has been stored properly.
Quick checklist
| Check | What to look for |
|---|---|
| Strains | Full strain names, chosen to work together |
| CFU | Guaranteed through the best-before date |
| Prebiotics | Included, e.g. FOS |
| Postbiotics | Included, from fermentation |
| Stability | Shelf-stable, blister-packed |
| Quality | Clear sourcing, free from additives you avoid |
| Brand | Long track record, authorised retailer |
New to probiotics? Where to start
Start with one capsule a day for the first few days if your gut is sensitive, then move to the full dose. Take it at the same time each day so it becomes a habit. Give it a few weeks before judging the results. Most people notice changes gradually rather than overnight.
How Dr. Ohhira's measures up
- 13 probiotic strains plus prebiotics (FOS) and postbiotics in every capsule.
- Naturally fermented in Japan from fruits, vegetables, mushrooms and seaweed: 3 years for the Original Formula and 5 years for the Professional Formula.
- Shelf-stable and blister-packed, so no refrigeration is needed.
- Vegetarian, non-dairy, gluten-free and non-GMO, with no artificial colours or preservatives.
- Research going back to 1974 and trusted for over 30 years. The Original Formula won the 2026 Taste for Life Supplement Awards Essential Award in Digestive Health.
We're an authorised US retailer of Dr. Ohhira's Probiotics. Subscribe and save 10% on either formula.
Sources
- Hill C, et al. (2014). The ISAPP consensus statement on the scope and appropriate use of the term probiotic. Nature Reviews Gastroenterology & Hepatology 11, 506–514.
- NIH Office of Dietary Supplements. Probiotics fact sheet for consumers.
This article is for information only and isn't medical advice. Talk to your doctor before starting any new supplement.
