CFU Count Explained: What 100 Billion Actually Means
CFU is the most visible number on a probiotic label — and the most misunderstood. A manufacturer's guide to potency claims at expiry.
Colony-forming units (CFU) count the live bacteria that can multiply — but a number on the label is only meaningful if you know when it was measured.
Key Features
Label claims are always measured at expiry, not at manufacture
Overages of 30–50% are common to guarantee the claim
Third-party verification gives retailers confidence
High CFU is not always better — strain function matters more
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