At manufacture vs through expiration: how to read probiotic potency and storage claims
A probiotic CFU number needs a serving basis, a shelf-life basis, and the product’s storage directions. Keep those qualifiers visible before comparing potency or price.
A probiotic label may state CFU at the time of manufacture, through an expiration or use-by date, or without a clearly visible timing qualifier. Those declarations should not be treated as equivalent. Viable-organism counts can decline over time, and the product’s stated storage conditions are part of the evidence needed to interpret the number.
Why the timing statement matters
The NIH Office of Dietary Supplements explains that some products list CFU at manufacture while others list the amount through the expiration or use-by date. Because CFU can decrease over time, the manufacturing count does not necessarily describe the count when the product is purchased or used.
LabelLens should therefore store the number and its timing basis together. Removing the qualifier can make an older or differently guaranteed product appear directly comparable when it is not.
Storage language is product-specific
Some labels require refrigeration.
Others permit room-temperature storage.
Some specify limits for heat, moisture, or time after opening.
Absence of refrigeration wording is not proof of shelf stability under every condition.
The captured label should remain the authority for the listed product and variant. Storage assumptions should not be borrowed from another product, another package, or a general statement about the species.
How to capture a potency declaration
Record CFU per labeled serving, including the serving units.
Capture the exact phrase that establishes “at manufacture,” “through expiration,” “through best by,” or another basis.
Record the expiration or use-by date when it belongs to the observed package.
Preserve the storage directions and any after-opening qualification.
Keep the source URL, access date, and package variant with the record.
Be careful with normalized price
Cost per billion CFU is only meaningful when the offer, serving size, CFU amount, and shelf-life basis belong to the same product variant. Even then, it is a price calculation—not a measure of effectiveness, strain appropriateness, manufacturing quality, or remaining viability in a particular bottle.
When the catalog should show “not available”
The CFU amount lacks a clear serving basis.
The page mixes a retailer title with a different Supplement Facts image.
The timing qualifier cannot be verified.
The storage instructions are cut off or belong to another variant.
The offer or label evidence is no longer current enough for the intended use.
A truthful comparison preserves uncertainty. A missing timing or storage field should remain missing rather than being inferred from marketing language or common practice.