Live Cultures Decoded: Live Cultures Decoded: Species, Strains and CFU

When you pick up a supplement labelled as containing live cultures, it is easy to assume that one product is much like another. In reality, the science behind these formulations is far more nuanced. The term “live cultures” covers a vast range of different microorganisms, each with its own unique properties and potential benefits. Understanding this complexity is key to making an informed choice, and the most important factor to consider is strain specificity.

Not all live cultures are created equal. Think of them like different varieties of apples: all are apples, but a Braeburn is quite different from a Granny Smith. Similarly, within a species such as Lactobacillus acidophilus, there are many distinct strains. Each strain has a unique genetic makeup, which influences how it interacts with the body. Research suggests that specific strains are associated with particular functions. Different strains of the same species are studied separately. A label can name the species (ours do) and, sometimes, the strain code.

Another common point of confusion is the CFU count—the number of colony-forming units. You will often see numbers in the billions on the front of a pack. However, a critical detail is whether that number refers to the count at the time of manufacture or at the end of the product’s shelf life. Live cultures are living organisms, and their numbers can decline over time. A product promising 20 billion CFU at manufacture may have far fewer by the time you consume it, especially if it has been stored improperly. Check whether the CFU count is stated at manufacture or at expiry.

Even if you consume a high number of live cultures, they face a formidable journey through the digestive system. The stomach is an acidic environment, designed to break down food and kill harmful bacteria. Many live cultures are sensitive to this acidity and may not survive the passage into the intestines where they are thought to be most active. This is where delivery technology becomes crucial. Some products use delayed-release capsules; ours use HPMC capsules taken before meals.

Scientific research has focused on a number of well-studied strains. Lactobacillus acidophilus is one of the most common and is associated with supporting the balance of the gut microbiota. Saccharomyces boulardii is a yeast, not a bacterium.

When selecting a live cultures supplement, look beyond the marketing. Check the label for the exact strain names, the CFU count at expiry, and the delivery mechanism. As with any supplement, it is sensible to consult a healthcare professional before starting a new regimen, particularly if you have an underlying health condition or are taking medication.

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This article is for informational purposes only and does not constitute medical advice. Vitadefence supplements are food supplements, not medicines. Consult a healthcare professional if you are pregnant, breastfeeding, on medication, or have a medical condition.