If you’ve ever wondered whether you should take a probiotic, add more fibre to your diet, or do both, you’re really asking one question: what might help support your gut?

In this guide, we’ll break down prebiotics vs probiotics in plain English: what they are, what they do, and how to choose something that will work for you (without the jargon).

Prebiotics vs probiotics: what are they and what do they do?

Prebiotics and probiotics both support gut health, but in slightly different ways. Probiotics are ‘friendly’ bacteria that live in your intestines, while prebiotics are the fibres that feed them. Together, they can help support healthy digestion, everyday immune function, and general wellbeing as part of a balanced lifestyle. 

• Prebiotics are non-digestible fibres (and some plant compounds) that your body cannot break down but your beneficial gut bacteria can. They act as “fuel” for these microbes in your large intestine.

• Probiotics are live microorganisms (usually specific strains of bacteria or yeasts). When taken in adequate amounts, they can support a healthy balance of gut bacteria.

As supplements, prebiotics and probiotics may help support regular bowel habits, everyday digestive comfort, and general immune health.

But one of the first things to know about probiotic and prebiotic supplements is that they vary significantly in terms of their contents and quality. It’s important to know what to look for and to check with a healthcare professional if you have ongoing symptoms or medical conditions.

What are probiotics?

To understand how probiotics work, it helps to understand how the microbiome works. 

Within your large intestine are trillions of microbes arranged like a living carpet over your gut lining. They are literally alive - they eat (mainly the fibres you cannot digest), they grow, they compete with each other, they communicate with other parts of the body, and they produce useful substances that your own cells can use.

Different species have different jobs. Some ferment fibre, some produce nutrients, others live in the gut wall and support the immune system. Together, they act as a crowd of friendly locals that support one another.

Unfortunately, these good microbes can be affected by common lifestyle factors such as antibiotics, processed food, stress, alcohol, and pollution. Including probiotic foods or supplements in your routine can help support the balance and activity of your gut bacteria.

Common probiotic sources include:

• Fermented foods such as yoghurt with live cultures, kefir, sauerkraut, kimchi, and miso.

• Dietary supplements in capsules, powders, liquids, or chewables.

What are prebiotics?

Prebiotics are nutrients that pass through your gut and end up in the large intestine, where they act as food for beneficial microbes. When those microbes break down prebiotics, they produce compounds such as vitamins and short‑chain fatty acids that help support the normal structure and function of your gut.

There are many different types of prebiotics, including: 

• Inulin and oligofructose (often from chicory root)

• Fructo-oligosaccharides (FOS)

• Galacto-oligosaccharides (GOS)

• Various starches and fibres in foods
  
  

Good sources of prebiotics include:

• Foods such as garlic, onions, leeks, asparagus, bananas, oats, barley, chickpeas and lentils

• Dietary supplements in capsules, powders, and gummies 

The takeaway: Think of probiotics as the plants in the garden and prebiotics as the fertiliser that helps them grow.

Everyday benefits: what do they actually do?

Together, prebiotics and probiotics can support: 

• A healthy, balanced gut microbiome

• Regular bowel movements 

• Digestive comfort 

• Healthy immune function

• General wellbeing, especially during times of stress, or changes to routine

Different probiotic strains have different effects, and not all probiotic supplements are the same.

The strains most commonly used in supplements include Lactobacillus, Bifidobacterium, and yeasts such as Saccharomyces. Each of these strains has unique properties. For example, many Lactobacillus strains are used in products that support general immune function and women’s health, while Bifidobacteria are often used to support bowel health and gut comfort. Always check the label to see which strains are included and what they are intended to support.

It’s also worth checking that the product guarantees a high CFU count (colony-forming units), as this refers to the numbers of live and active cultures.

Safety notes and who they may or may not suit

Prebiotics and probiotics are generally considered suitable for most healthy adults as part of a balanced wellness routine. However, here are some helpful pointers:

• Too much too soon can cause gas, bloating, or changes to your normal bowel habits. Start with a low dose and increase gradually. Drink plenty of water.
  
  

• Everyone tolerates prebiotics differently. Some people may find that certain prebiotic fibres cause uncomfortable digestive symptoms. While these are often only temporary, it may help to try a range of prebiotics until you find which works for you.
  
  

• If you are pregnant, breastfeeding, have ongoing gut symptoms, take medication, or have been diagnosed with a medical condition, always check with your doctor or pharmacist before starting new supplements.
  
  

• Stop using any product and seek medical advice if you experience symptoms such as severe abdominal pain, persistent diarrhoea, fever, or signs of an allergic reaction.

A Beginner's Guide: Prebiotics vs probiotics: which should you start with? 

Step 1: Increase your fibre

Many people don’t eat enough fibre, and increasing your intake can help support the diversity and balance of your good gut bacteria. High-fibre foods you can add to your diet include wholegrains, legumes, nuts, seeds, fresh fruits, and vegetables. 

Step 2: Add probiotic foods
Fermented foods such as unsweetened acidophilus yoghurt, kefir, sauerkraut, and miso can provide naturally occurring live cultures alongside beneficial nutrients, such as protein and calcium.

Step 3: Consider supplements

Broad‑spectrum probiotic supplements can be used to help support digestive function, immune system health, and overall gut balance. Check out GO Healthy GO Probiotic 40 Billion, NutraLife ProBiotica High Potency 50 Billion, and Lifestream Probiotics 14 Strains.
Some products are formulated to support specific aspects of gut and general health. For example:

• for digestive comfort and bowel regularity, such as Inner Health IB Support

• to support women’s health, such as: Life-space Probiotic Women's Microflora,  Inner Health Women's 5 In 1 Probiotic

• to support gut health when travelling, such as: BLIS Travel Protect Lozenges

• to support gut flora during and after antibiotic use, such as: Clinicians Antibiotic Support Probiotics, GO Healthy GO Antibiotic Support
  
  

Prebiotic supplements can be useful if you struggle to get enough fibre from your diet. Powders such as Bioglan Prebiotic Fibre or Good Health Gut Guard can be added to water, juice, smoothies, cereal, or baking to help increase your daily fibre intake and support digestive health. Chewables such as Nature's Way High Strength Adult Vita Gummies Pre + Probiotic are a convenient option for supporting gut health on the go.

Always read the label and use as directed. If symptoms persist see your healthcare professional.