How to Read a Probiotic Label Step by Step: Strain, CFU at Expiry, Other Ingredients and Directions
A step-by-step checklist for reading a probiotic label: strain code, count at the end of shelf life, storage, other ingredients and directions, with no brands or rankings.
Content last updated . This page has not been medically reviewed.
Quick answer
A good probiotic label lets you connect the product to the research. ISAPP, a scientific association, lists what probiotic labels should carry: genus, species and strain for each strain, the minimum viable number at the end of shelf life, a serving size matched to any benefit claimed, proper storage conditions and contact details. [1] Many labels fall short. This page walks through the checklist; it does not rank or recommend any product.
Why the label matters
Probiotics are generally classed as food rather than medicine in the UK, and the NHS says that means we cannot always be sure the product contains the stated bacteria, enough of them, or bacteria that survive long enough to reach the gut. [3] In the US, FDA is not authorized to approve dietary supplements for safety and effectiveness before they are marketed. [4] A scientific review concluded that probiotic foods and supplements frequently do not match their labels for strain or viable cell number. [5]The checklist
| Step | What to look for | What the sources say |
|---|---|---|
| Live microorganisms, in an amount shown to help | ISAPP's 2014 consensus keeps the definition "live microorganisms which when administered in adequate amounts confer a health benefit on the host". [6] Foods without tested microbes can be described as having "live, active cultures". [1] |
| Genus, species and strain code for every strain | ISAPP says labels may list genus and species with no strain. [1] |
| Total or per-strain CFU, and the time it applies | ISAPP's FAO/WHO summary asks for minimum viable numbers at the end of shelf life. [1] |
| The storage line and expiry date | Storage conditions are on ISAPP's list. [1] |
| Anything you need to avoid | Check it against your own needs with a pharmacist. |
| Serving size and what the label claims | A claim should be backed by studies on the strain and dose. [1] |
Step 2 in more detail: strain
If the label shows only a species such as Lactobacillus acidophilus, you cannot tell which strain is inside. ISAPP's survey summary found 45% of retail supplement products gave no strain designation, and only 35% could be linked, by strain and dose, to evidence of a health benefit. [1] If the label uses a newer genus name than the study, match the strain code; see strain names and the 2020 renaming.Step 3 in more detail: count
ISAPP says the same survey found an equal share of products gave no measure of potency through the end of shelf life. [1] For a multi-strain product, a single total count does not show whether strains are present in equal amounts. [1] Health Canada's archived 2010 notice for natural health product licence applications asked that the label-claim number of viable organisms be present at the end of the expiry period; the page is archived and not updated. [7] Other countries differ, and we did not read their rules. See CFU: what the number means and does not.Step 4 in more detail: storage
Storage instructions on the label come from the maker of that product. A 12-month study of commercial multi-strain supplements found storage temperature was the main factor in viability. [8] See Probiotic storage.What a label cannot tell you
- Whether the product works for you. NCCIH says different probiotics may have different effects. [2]
- Whether the count is true. One laboratory study of locally marketed products (authors in Pakistan) found almost none met the label claim. [9] It is one study, not a market ranking.
- Whether it is safe for your situation. See the safety section above.
Third-party testing is covered generally on Quality testing and certifications and label accuracy and third-party testing. The broader guide is Reading supplement labels.
Frequently asked questions
How do I choose a probiotic?
This site does not recommend products. The evidence is strain-specific, so a useful starting point is a label that names the full strain and a study on that strain for your question, discussed with a clinician or pharmacist. [10]
What should a probiotic label include?
ISAPP lists genus, species and strain, minimum viable numbers at the end of shelf life, serving size, storage conditions and contact details. [1]
Is "live and active cultures" the same as probiotic?
Not necessarily. ISAPP says products with undefined microbes and no health-effect studies could be labeled as containing live, active cultures instead. [1]
Does a label mean the product was approved by a regulator?
Not in the US. FDA says it is not authorized to approve dietary supplements for safety and effectiveness before they are marketed. [4] Other countries are covered on how probiotics are regulated.
Who should ask before taking a probiotic?
People with a serious health condition or weakened immune system should talk to a doctor first. [3] NCCIH advises consulting a health care provider before using a probiotic supplement. [2]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Before you read: safety first
NCCIH says the risk of harmful effects from probiotics is greater in people with severe illnesses or compromised immune systems. [2] The NHS says people with an existing health condition or a weakened immune system should talk to a doctor before taking any probiotic supplement. [3] FDA advises talking to a doctor, pharmacist or other healthcare professional before deciding to use a dietary supplement. [4] Questions about pregnancy, children, older adults, kidney or liver conditions, medicines and surgery are not answered by a label; ask a clinician or pharmacist. See Probiotic safety and medication interactions.
References
- Sanders ME. Decoding a Probiotic Product Label. International Scientific Association for Probiotics and Prebiotics (ISAPP), 2022, updated 21 June 2025. Read 2026-10-22.
- NCCIH (US National Center for Complementary and Integrative Health). Probiotics: Usefulness and Safety. Page shows Last Updated August 2019. Read 2026-10-22.
- NHS (UK). Probiotics. Page last reviewed 24 November 2022. Read 2026-10-22.
- US Food and Drug Administration. Information for Consumers on Using Dietary Supplements. Content current as of 10/21/2022. Read 2026-10-22.
- Authenticity of probiotic foods and dietary supplements: A pivotal issue to address. Crit Rev Food Sci Nutr 2022 (erratum 2023). PMID 33819118. Read 2026-10-22.
- 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. PMID 24912386. Read 2026-10-22.
- Health Canada. ARCHIVED - Notice - Product Licence Applications for Natural Health Products Containing Probiotics. Notice dated January 2010; page archived by Health Canada. Read 2026-10-22.
- Brousilova T et al. Storage temperature as a determinant of probiotic long-term stability in commercial dietary supplements. Front Nutr 2026. PMID 42824401. Read 2026-10-22.
- Aziz G, Zaidi A, Tariq M. Compositional Quality and Possible Gastrointestinal Performance of Marketed Probiotic Supplements. Probiotics Antimicrob Proteins 2022. PMID 35199309. Read 2026-10-22.
- McFarland LV, Evans CT, Goldstein EJC. Strain-Specificity and Disease-Specificity of Probiotic Efficacy: A Systematic Review and Meta-Analysis. Front Med 2018. PMID 29868585. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.