Live Cultures Explained: What the Label Tells You

Your gut contains trillions of microorganisms — collectively known as the gut microbiome — that influence far more than just digestion.

The beneficial bacteria in your microbiome help train immune cells to distinguish between harmful invaders and harmless substances.

Your gut and brain are connected via the vagus nerve and a complex network of chemical signals.

Look for supplements that specify the strains used (e.g., Lactobacillus acidophilus, Bifidobacterium lactis) and guarantee a minimum CFU (colony forming units) count at time of expiry, not just at manufacture. Multi-strain formulas are generally preferred over single-strain products.

Prebiotics — the fibre that feeds probiotics — are equally important. Good prebiotic sources include garlic, onions, bananas, oats, and asparagus. Some supplements combine both probiotics and prebiotics (called synbiotics) for a comprehensive approach.

Live-culture products differ a great deal. Here is what to look for:

• Strains: the label lists the species in the blend.
• CFU count at expiry: The number of colony-forming units should be guaranteed at the time of expiry, not just at manufacture. Probiotics are living organisms that die over time. The label states the count per capsule (for example 4 billion or 20 billion).
• Multi-strain formulas: products that contain several species.
• Storage requirements: Some probiotics require refrigeration while others are shelf-stable. Shelf-stable products are more convenient but check that the manufacturer has verified stability at room temperature.

Take your probiotic at the same time each day for consistent colonisation — many experts recommend with breakfast or just before a meal. Feed your good bacteria with prebiotic fibre from garlic, onions, leeks, asparagus, bananas, and oats. Eat a diverse range of plant foods — aim for 30 different plant species per week (including fruits, vegetables, herbs, spices, nuts, and seeds) to maximise microbial diversity. Regular exercise and enough sleep are part of a healthy lifestyle.