How long should you take a probiotic? Daily use, how long studies ran, and when to stop
Published by Physician's Choice, which makes the products discussed on this site.
The short version
None of the health sources on this page sets an end date. NIH says no official recommendations cover probiotic use by healthy people, and it suggests asking your health care provider how long to use a product. ISAPP adds that probiotics "typically do not take up residence in your gut." 60 Billion Probiotic's directions: 1 capsule daily, with or without food, with no stop date.
Key facts
- No set length"There are no official recommendations that cover the use of probiotics by healthy people."[NIH Office of Dietary Supplements]
- Usually minor"Side effects of probiotics are usually minor and consist of self-limited gastrointestinal symptoms, such as gas."[NIH ODS, fact sheet for health professionals]
- Safety gapsFew studies have looked at probiotic safety in detail, so information on how often side effects happen, and how strong they are, is lacking.[NCCIH]
- Set coursesTrial reviews NIH summarizes gave probiotics for 10 days to 3 months in one review and 4 weeks to 6 months in another.[NIH ODS, fact sheet for health professionals]
- No lasting changeA review of 45 studies in healthy adults found no support for persistent changes in gut microbiota.[Khalesi et al., 2019]
- 30 days a bottle1 capsule daily, with or without food; the 30-count bottle holds 30 servings.[60 Billion Probiotic label and product page]
Should you take probiotics every day?
If you take one, the label sets the rhythm, and for 60 Billion Probiotic that rhythm is daily: 1 capsule, with or without food. A probiotic is also not something the gut keeps. ISAPP, the International Scientific Association for Probiotics and Prebiotics, says so directly:
"Probiotics typically do not take up residence in your gut and may not evoke any detectable change in the microbes that are normally present."
Research in healthy people points the same way. A 2019 review in the European Journal of Clinical Nutrition looked at 45 studies of live bacteria given to healthy adults. It found a short-lived rise in the bacteria each supplement supplied, and it "failed to support the ability of probiotics to cause persistent changes in gut microbiota."
None of this sets a number of months. For a healthy person, the length is left to you and your provider, which is what NIH suggests.
Is it safe to take a probiotic every day? What NIH and NCCIH say
For healthy people, the federal sources describe a good track record and admit gaps in the data. NIH's fact sheet for consumers says: "Most probiotics have been safely used in foods or dietary supplements for decades." Its fact sheet for health professionals adds that "Probiotics are unlikely to cause harm in healthy people, and side effects are usually minor."
The National Center for Complementary and Integrative Health, also part of NIH, describes "an extensive history of apparently safe use, particularly in healthy people." It then names the limit of that record:
"few studies have looked at the safety of probiotics in detail, so there’s a lack of solid information on the frequency and severity of side effects."
NIH's health professional sheet makes a related point about trial design: some probiotic trials "are not designed to adequately address questions about safety, leaving gaps in available safety evidence." None of the sources on this page gives a number of months or years after which daily use by a healthy person becomes a concern, and none reports a study of open-ended daily use.
The picture changes for people who are already very sick. NCCIH says the risk of harmful effects "is greater in people with severe illnesses or compromised immune systems."
How long did probiotic studies run?
Weeks to months, as set courses, and mostly in people with a specific health condition. Two of the reviews NIH's fact sheet for health professionals summarizes give their lengths. In one, 1,499 children and adults took a single strain for 10 days to 3 months across 12 trials. In the other, 877 adults took probiotics or a placebo for 4 weeks to 6 months across 10 trials.
Both reviews studied people in a specific medical situation, which this page leaves out because it is not about healthy daily use. Their lengths describe how long each study ran. They are not a minimum, and they are not a safe maximum.
The same NIH sheet sums up the World Gastroenterology Organisation's position on how long to use a probiotic: clinicians should only advise "probiotic strains, doses, and durations that have been shown to be beneficial in human studies." In plain terms, the length belongs to the strain and the study, which is one more reason a strain code on a label matters: the code is what lets you look up whether a study exists for that strain and how long it ran. The 10 codes in 60 Billion Probiotic, and which of them have a studied dose on record, are listed in High CFU probiotics: what to check beyond the 60 billion on the label.
How long to take a probiotic: what each source says
Each question about duration, with each source's answer in its own words where it has one.
| Question | What the source says | Source |
|---|---|---|
| Is there an official length of use? | No. "There are no official recommendations that cover the use of probiotics by healthy people." NIH suggests asking a provider "how long to use the product." | NIH ODS, consumer fact sheet |
| Is daily use safe for healthy people? | "Probiotics are unlikely to cause harm in healthy people, and side effects are usually minor." | NIH ODS, health professional fact sheet |
| How complete is the safety data? | Few studies have looked at safety in detail (NCCIH). Some trials "are not designed to adequately address questions about safety" (NIH). | NCCIH; NIH ODS |
| Is there any long-term record? | After one strain went into dairy products in Finland in 1990, monitoring through 2000 "revealed no increase in the rates of bacteremia (bacteria in the blood) caused by Lactobacillus species." That is a food strain across a population, not a daily capsule; NIH pairs it with a hospital record of higher risk in tube-fed intensive care patients, the severe-illness case in the doctor section below. | NIH ODS, health professional fact sheet |
| How long did trials run? | 10 days to 3 months (12 trials, 1,499 children and adults) and 4 weeks to 6 months (10 trials, 877 adults), in people in specific medical situations, not healthy daily users. | NIH ODS, summarizing two reviews |
| What should set the length? | Strains, doses "and durations that have been shown to be beneficial in human studies," as NIH summarizes the World Gastroenterology Organisation. | NIH ODS, citing WGO |
| Do the microbes stay after you stop? | They "typically do not take up residence in your gut" (ISAPP). No support was found for persistent changes in gut microbiota in healthy adults (Khalesi 2019). | ISAPP; Khalesi et al., 2019 |
| What does the 60B label say? | 1 capsule daily, with or without food. No end date is given. | 60 Billion Probiotic product page |
Sources were read on Oct 10, 2026, and are listed in full at the end of this page. Quotes are copied as the sources print them.
Does 60 Billion Probiotic say how long to take it?
No. Its directions give a daily serving and no end date: 1 capsule daily, with or without food. The 30-count bottle holds 30 servings of 1 capsule, so at the label serving one bottle runs 30 days.
What the bottle does carry is a date. Physician's Choice describes the formula as "60 billion CFU at expiration, across 10 strains identified by strain code." Its strain dossier adds that extra is packed in at the factory so the 60 billion count holds up to the expiration date. So the one time limit is on the bottle, not on you: use it by that date, and store it cool and dry, as the directions say. What a printed date does and does not promise is set out in our Shelf-stable probiotic checklist: bottle, capsule and CFU at expiration.
How long to try a probiotic before judging it is a separate question from how long to keep taking one. Physician's Choice answers it on its own site, in How long does it take for probiotics to work?; the timing of a daily dose is in When is the best time to take a probiotic? Morning, night, and with food. What to track while you try one is in Signs your probiotic is working.
"If I feel exactly the same, I somehow keep going"
When should you stop taking a probiotic and talk to a doctor?
Before you start, if one of the groups in the line below fits you, and at any point a reaction worries you. Physician's Choice puts the first part this way:
Physician's Choice, on who should ask first
If you are pregnant or breastfeeding, are seriously ill, or have a weakened immune system, consult your healthcare provider before taking a probiotic or any other dietary supplement.
NCCIH adds two rules that apply however long you have been taking one. "Anyone with a serious underlying health condition should be monitored closely while taking probiotics." And a probiotic is never a reason to put off care: "Don’t use probiotics as a reason to postpone seeing your health care provider about any health problem."
Before you start, and when to stop
- Stop and call a doctor if gas, cramps or loose stools are strong, or are getting worse rather than settling.
- Stop and get care for blood in your stool or severe belly pain.
- Ask again if your situation changes: a pregnancy, a serious illness, or a medicine that weakens the immune system.
- Starting an antibiotic? Ask your pharmacist about timing.
More on the NIH line about gas in the first days is in Is 60 billion CFU too much?
Where 60 Billion Probiotic fits
Physician's Choice, which publishes this site, makes 60 Billion Probiotic: 1 capsule per serving, 30 servings to the bottle, and a 220 mg probiotic blend with 60 billion CFU, counted at expiration per the strain dossier. Its directions are 1 capsule daily, with or without food, and they name no length of use, so how long to take it is a choice for you and your provider. Taking it alongside a digestive enzyme is covered in Can you take digestive enzymes and probiotics together?
Sources for this page
Short answers
Should I take probiotics every day?
Follow the label of the product you take. 60 Billion Probiotic's directions are 1 capsule daily, with or without food. NIH adds that no official recommendation covers probiotic use by healthy people, so how long to keep going is a question for your health care provider.
Can you take probiotics every day long term?
NIH says probiotics are unlikely to cause harm in healthy people and that side effects are usually minor. NCCIH adds that few studies have looked at probiotic safety in detail. None of the sources on this page sets a limit in months or years, so long-term use is a question for your provider.
Should you take a break from probiotics?
None of the sources on this page tells healthy people to cycle a probiotic on and off, and none gives a break schedule. The 60 Billion Probiotic directions give a daily serving and do not mention breaks. Stop and ask a doctor if a reaction worries you.
What happens when you stop taking a probiotic?
ISAPP says probiotics typically do not take up residence in your gut, and a 2019 review of 45 studies in healthy adults found no support for persistent changes in gut microbiota. No source on this page describes symptoms from stopping.
How long does a bottle of 60 Billion Probiotic last?
30 days at the label serving. The 30-count bottle holds 30 servings of 1 capsule, and the directions are 1 capsule daily, with or without food. The strain dossier says the 60 billion CFU count holds to the expiration date, so use the bottle by that date.