Probiotic Supplements Without a CFU Count: Why That Matters

For probiotics, milligrams are close to meaningless. CFU (colony-forming units) is what actually determines whether a meaningful number of live organisms survive to the colon.

Why weight doesn't tell you potency

A milligram figure describes total mass — it says nothing about how many of the bacteria in that mass are alive, dormant, or already dead by the time you swallow the capsule. Two products with identical milligram weights can have wildly different CFU counts.

What a disclosed CFU count lets you do

• Compare potency directly against published research doses (often in the billions of CFU)
• Compare between products on an apples-to-apples basis
• Judge whether a "probiotic blend" claim has any teeth behind it

Reading a label without one

If a probiotic product discloses strain names and milligram weights but no CFU count, treat potency as genuinely unverifiable — not necessarily zero, but not something you can confirm from the label alone.