The probiotic category has grown so fast that choosing has become confusing. What you see most is a CFU arms race — 10 billion, 20 billion, 50 billion — as though a bigger number is automatically better. In reality CFU is only one of four variables you need to read together.
The short version
- Most research uses 1–10 billion CFU a day, not 50 billion.
- The number on the label is usually at manufacture, not at expiry.
- A formula that names its strains is more trustworthy than one that only counts them.
- It takes 4–8 weeks of daily use before you can judge anything.
01 Pro, pre, post, syn — the four words people mix up
- Probiotics — live beneficial organisms. They have to survive as far as the intestine to do anything.
- Prebiotics — the kinds of fibre those organisms feed on, such as inulin, FOS and GOS. Not alive, so they keep far longer and tolerate heat.
- Postbiotics — compounds produced by the organisms during fermentation, including inactivated cells. Nothing alive, so they survive stomach acid and need no refrigeration.
- Synbiotics — probiotics plus prebiotics in one formula. Most products on the market today are this.
Fermented foods are the original source, but the amount and the strains vary batch to batch. That is why anyone wanting a predictable result moves to a formula that states strains and CFU on the label.
02 How much CFU is enough
CFU (colony forming units) is the count of live organisms. Most research uses 1–10 billion CFU a day. The number on the label is usually the count at manufacture, not at expiry — and the higher the number, the harder it is to hold.
More important than the CFU figure are the encapsulation technology and the choice of acid-tolerant strains, because the organisms have to survive stomach acid at pH 1.5–3.5 before reaching the small intestine.
03 The main strains worth knowing
| Strain | What sets it apart |
|---|---|
| Lactobacillus acidophilus | The most common baseline strain, lives in the small intestine |
| Lactobacillus plantarum | Good acid tolerance, common in fermented foods |
| Bifidobacterium lactis / longum | Lives in the large intestine, associated with regularity |
| Lactobacillus rhamnosus | One of the most heavily researched strains |
| Lactobacillus reuteri | Often found in formulas aimed at women |
The simple rule. A formula that names its strains is more trustworthy than one that says only “10 probiotic strains”, because different strains work in different parts of the gut.
04 Sachets or capsules
| Criterion | Drink sachet | Capsule |
|---|---|---|
| Acid protection | Lower, unless the strains are encapsulated | Better — the capsule provides some protection |
| Convenience | Easy to take, has flavour, good for anyone who struggles with pills | Easy to carry, no taste |
| Room for prebiotics | Plenty — more volume available | Limited |
In short: if you want high CFU per serving and easy carrying, take capsules. If you also want fibre and prebiotics, or cannot swallow capsules, take sachets.
05 When to take it and for how long
Take it on an empty stomach in the morning or before bed, when stomach acid is lower than after a meal. Postbiotics can be taken any time, because there are no live organisms to protect.
On duration, most research runs 4–8 weeks or longer. Taking it for a few days and concluding it does nothing is too early. Most supplement organisms do not colonise permanently, so it needs to be continuous, alongside eating enough fibre.
Frequently asked questions
I feel bloated when I start. Is that normal?
- Some bloating or gas in the first week is common, especially if prebiotics are included. Start with half a sachet and build up.
Can yogurt replace a probiotic?
- Partly. Ordinary yogurt usually has a limited range of strains and a lot of sugar, which is why people watching sugar tend to use a supplement instead.
Does it need refrigerating?
- WISAMIN formulas use room-temperature-tolerant organisms and store at room temperature, though a fridge holds the CFU count better. Keep them out of heat and direct sunlight.
Can I take it with antibiotics?
- Leave at least 2 hours between them, and if you are undergoing treatment, speak to a doctor or pharmacist first.
Related products
Probiotics, prebiotics and postbiotics, made in a GMP-certified facility and Thai FDA registered.
- Gut & digestive care — sachets and capsules, with prebiotic and postbiotic formulas.
- Fill the nutrition gaps — fibre and seeds, to add prebiotics from food.
This article provides general nutritional information for education. It is not medical advice. Dietary supplements are not medicines and do not treat, relieve or prevent any disease. Eat a varied diet and read the warnings on the label before use.
