Probiotic vs Prebiotic: What’s the Difference and Do You Need Both?

Probiotics vs Prebiotics: The Simple Explanation

Probiotics are live microorganisms (bacteria and yeasts) that, when consumed in adequate amounts, confer a health benefit. Think of them as adding beneficial tenants to your gut.

Prebiotics are non-digestible fibres and compounds that feed your existing beneficial bacteria. Think of them as fertilizer for the good bacteria already living in your gut.

Synbiotics combine both in a single supplement — live bacteria plus the fibre they thrive on. The ISAPP (International Scientific Association for Probiotics and Prebiotics) formalized this definition in 2020.

Best Prebiotic Foods Available in Canada

You don’t need a supplement if you eat these regularly:

• Chicory root — highest natural source of inulin (available as Roasted Chicory at Bulk Barn)
• Garlic & onions — contain fructo-oligosaccharides (FOS)
• Oats — beta-glucan fibre feeds Bifidobacteria
• Bananas (especially slightly green) — resistant starch
• Asparagus — 2–3g inulin per serving
• Jerusalem artichoke (sunchoke) — up to 76% inulin by dry weight
• Flaxseed — Canadian-grown, widely available at Costco

Best Probiotic Foods in Canada

• Kefir — Liberté and Olympic brands, 12+ bacterial strains per serving
• Yogurt with live cultures — look for "contains active bacterial cultures" on the label (Activia, Astro BioBest)
• Sauerkraut — must be refrigerated/unpasteurized (Bubbies, Wildbrine at Whole Foods)
• Kimchi — found in most Canadian grocery stores refrigerated section
• Kombucha — Rise, Tonica, GT’s (all available in Canada)
• Miso — paste form at Asian grocery stores or T&T Supermarket

Do You Need Both? Decision Framework

You likely need neither as a supplement if: You eat 5+ servings of fruits/vegetables daily, include fermented foods 3–4 times per week, and have no digestive symptoms.

Consider a probiotic if: You’ve recently taken antibiotics, have IBS/bloating, or experience frequent vaginal infections.

Consider a prebiotic if: You eat fewer than 25g of fibre daily (most Canadians get only 14g), rarely eat garlic/onions/oats, or want to support existing gut flora.

Consider a synbiotic if: You want the simplicity of one supplement covering both, or you’re rebuilding your microbiome after antibiotics.

Top Synbiotic Supplements in Canada

Seed DS-01 Daily Synbiotic — 24 strains, 53.6 billion AFU, with a prebiotic outer capsule. Ships to Canada, ~$50/month. The most clinically referenced synbiotic available.

Genuine Health Fermented Gut Superfoods+ — Canadian-made, combines fermented prebiotic fibres with probiotic cultures. ~$40 at Well.ca.

Frequently Asked Questions

What is the difference between a probiotic and a prebiotic?

Probiotics are live beneficial bacteria you add to your gut. Prebiotics are fibre compounds that feed the beneficial bacteria already in your gut. Probiotics = adding workers; prebiotics = feeding the workers you already have.

Can you take probiotics and prebiotics together?

Yes — this combination is called a synbiotic. Taking them together can be more effective because the prebiotic fibre feeds the probiotic bacteria, helping them survive and colonize. Many supplements now combine both.

Do I need a prebiotic supplement if I eat enough fibre?

Probably not. If you eat 25–30g of fibre daily from diverse sources (oats, garlic, onions, bananas, legumes), you’re already getting adequate prebiotics from food. Supplements are for people who struggle to hit fibre targets.