The Beginner's Guide to Probiotics

The Beginner's Guide to Probiotics

Anshul Kaushik

Probiotics are live microorganisms, mostly bacteria and some yeasts, that may offer health benefits when you take enough of them. They live mainly in your digestive tract. Many healthy adults try a daily probiotic to support digestive health, and most tolerate them well. Research is promising but still mixed, so the right choice depends on your goals, your health and the specific strains in the product.

What are probiotics?

The NIH Office of Dietary Supplements describes probiotics as live microorganisms that provide health benefits when taken in sufficient amounts. They mainly act in the digestive tract.

Your gut already holds a large community of microbes, often called the gut microbiome. Cleveland Clinic explains that probiotics add beneficial microbes to the populations already living in your body, mainly in your gut.

You will also see two related terms on labels:

  • Prebiotics are food parts your body cannot digest. Gut microbes use them as fuel. They are found mainly in high-fiber foods.
  • Synbiotics are products that combine probiotics and prebiotics.

Both definitions come from Mayo Clinic.

The most common types of probiotics

According to the National Center for Complementary and Integrative Health (NCCIH), the most common probiotics are Lactobacillus and Bifidobacterium bacteria. Yeasts such as Saccharomyces boulardii are also used.

Each probiotic has three parts to its name: genus, species and strain. Effects can differ from one strain to the next. That is why the NIH suggests checking the full genus, species and strain on the label.

You may notice some unfamiliar names too. Scientists have renamed several Lactobacillus species. For example, the NIH lists the well-studied strain Lactobacillus rhamnosus GG as Lacticaseibacillus rhamnosus GG.

What does CFU mean?

CFU stands for colony-forming units. The NIH calls it a more accurate measure of active microorganisms than total weight. Labels often show amounts like 1 billion or 10 billion CFU.

A higher number is not automatically better. The NIH notes that benefits depend on both the specific strains and the CFU amount. CFU counts can also drop over time. Some experts recommend choosing products that list the CFU count expected at the expiration date.

What does the research say?

Here the honest answer is: it depends. The evidence is stronger for some uses than others, and it is still developing.

  • Some promising areas. The NIH reports that probiotics may help reduce diarrhea linked to antibiotic use, especially when started within 2 days of the first antibiotic dose. NCCIH rates the overall evidence there as moderate quality.
  • Mixed results. The NIH describes findings on cholesterol and body weight as inconsistent. Some studies found no benefit at all.
  • Many open questions. NCCIH says that for most conditions, it is unclear which strains work, what doses are needed or who benefits most.

Mayo Clinic sums it up well. The research is promising, but it has not shown conclusively that these products improve health or are safe for everyone.

You may see claims online that probiotics help with weight loss or workout recovery. Current evidence does not support those claims with confidence.

Probiotics from food

You can get probiotics from food as well as supplements. Fermented foods that may contain them include:

  • Yogurt and kefir
  • Cheese, including cottage cheese
  • Sauerkraut and kimchi
  • Miso and kombucha
  • Pickles

Not every fermented food contains probiotics with proven benefits, the NIH notes. Processing can also destroy them. Cleveland Clinic suggests looking for "live and active cultures" on the label. Supplements usually provide higher doses than food.

How to choose and take a probiotic supplement

There are no official probiotic recommendations for healthy people, according to the NIH. These label checks can help you compare products:

  • Strains: Look for the full genus, species and strain names.
  • CFU: Note the count, and whether it is guaranteed through the expiration date.
  • Storage: Some probiotics need refrigeration. Others are fine at room temperature.
  • Allergens: Check for dairy, gluten or other ingredients you avoid.
  • Quality testing: The FDA does not approve dietary supplements before they are sold. Third-party testing is one way brands show what is in the bottle.

Consistency matters more than timing for most people. Cleveland Clinic says most probiotics should be taken daily for best results. Some work better with food and others on an empty stomach, so follow the label.

As one example, our Bowtrol Probiotic provides 9 billion CFU from 8 strains, including DDS-1 and Bifidobacterium, plus magnesium. You take 1 capsule a day, ideally on an empty stomach. It is vegetarian, gluten- and lactose-free, contains no stimulants, and each batch is third-party tested for potency. It is designed to support digestive health as part of a balanced routine.

Safety: who should talk to a doctor first

Probiotics have a long history of apparently safe use in healthy people, NCCIH says. Still, they are not right for everyone. Talk with your doctor before starting a probiotic if you:

  • Have a weakened immune system or take immune-suppressing medicine
  • Are seriously ill or in the hospital
  • Are pregnant or breastfeeding
  • Are thinking of giving probiotics to a premature infant or young child

NCCIH notes that severe or fatal infections have been reported in premature infants given probiotics. People with severe illness or weakened immunity also face higher risk.

For healthy adults, the most common side effects are mild. Cleveland Clinic says short-term gas or bloating can happen, and it should settle within a few days. Starting with the labeled dose and taking it consistently can help your body adjust.

Frequently asked questions

What are probiotics?

Probiotics are live microorganisms, mostly bacteria and some yeasts, that may benefit health when taken in enough amounts. They work mainly in the digestive tract. Common types include Lactobacillus, Bifidobacterium and Saccharomyces boulardii.

Should I take a probiotic every day?

If you choose to take one, daily use is typical. Cleveland Clinic says most probiotics should be taken daily for best results. Follow the dose and timing on the label.

Is a higher CFU count better?

Not necessarily. The NIH says benefits depend on both the strains and the CFU amount, not the number alone. Look for a count guaranteed through the expiration date.

Do probiotics have side effects?

Most healthy people tolerate them well, though mild gas or bloating can happen at first. Cleveland Clinic says this usually settles within a few days. People with weakened immune systems or serious illness should ask a doctor first.

Can I get probiotics from food instead?

Yes, fermented foods like yogurt, kefir, sauerkraut and kimchi can contain them. Look for "live and active cultures" on the label. Supplements usually provide higher doses than food.

Are probiotic supplements approved by the FDA?

No. The FDA does not approve dietary supplements before they are marketed. That is why checking labels, strains and third-party testing is worth the effort.

The bottom line

Probiotics are live microbes that may support digestive health, but the evidence varies by strain and use. A good product lists its strains, CFU count and storage needs clearly. If you have health concerns, check with your doctor first. You can browse more options in our digestion collection.

Sources

This article is for general information and is not medical advice. Statements about dietary supplements have not been evaluated by the Food and Drug Administration. Our products are not intended to diagnose, treat, cure or prevent any disease.

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