What are probiotics?

Probiotics are live microorganisms used for a demonstrated health benefit when taken in an appropriate amount. They are different from digestive enzymes: an enzyme acts on a particular food component, while a probiotic supplies selected microorganisms.

The strain matters

A probiotic name can include its genus, species and strain identifier. Evidence for one strain or combination should not be assumed to apply to every product with a similar name. The reason for taking it matters too: a formulation studied for one outcome may not be suitable for a different goal.

Probiotics, prebiotics and fibre

These terms describe different things. Probiotics are live microorganisms. Prebiotics are substances used by selected microorganisms; some fibres have this role. A product combining probiotics with prebiotic ingredients may be described as a synbiotic. Check the full ingredient list if particular fibres affect your food tolerance.

How to compare products

• Check the named strains and the purpose of the formulation.
• Read the serving directions, storage requirements and expiry date.
• Compare the complete ingredient list, including capsule materials and added fibres.
• Ask a pharmacist or dietitian whether the product suits your circumstances.

A higher microorganism count does not automatically mean a product is better for a particular person. The strain, evidence, dose and intended use need to be considered together.

Choosing an Australian product

Browse the Australian probiotic range to compare current formulations, pack sizes and directions. Once A Day has its own guide because its purpose and use differ from other products in the range.

When to ask for advice

Discuss probiotics with your doctor if you are seriously unwell, have a weakened immune system or are considering them for an infant. Wind or bloating can occur with some products. Persistent gut symptoms should be assessed rather than repeatedly changing supplements without a plan.

Further reading: Healthdirect Australia: probiotics and NIH: probiotic strains and evidence.