Beyond Probiotics: Unlocking the Science of Postbiotics with Alastair Jessel

What are postbiotics, and why might they be the next massive breakthrough in gut health? In this episode of the Microbiome Medics Podcast, Dr. Sheena Fraser is joined by Alastair Jessel, founder of The Postbiotic Company (AYA BIOME™), for an eye-opening dive into the world of post-fermentation microbial science.

Using a clever "beer factory" analogy, Alastair breaks down exactly how postbiotics differ from prebiotics and live probiotics, explaining why these stable, inanimate metabolites might bypass the common pitfalls of live probiotic supplements—like dying on the shelf or in stomach acid. The conversation explores the patented fermentation of turmeric, sharing compelling insights from clinical trials regarding inflammation, weight management, and systemic health, alongside striking anecdotal evidence for skin conditions like rosacea.

Dr. Fraser grounds the discussion with clinical nuance, emphasizing the foundational importance of a whole-food, plant-based diet and natural fermented foods, while exploring how targeted postbiotic supplements could support patients recovering from antibiotic use or managing chronic metabolic issues.

Tune in to learn:

• The fundamental differences between prebiotics, probiotics, and postbiotics.
• Why shelf stability and bioavailability are the biggest hurdles for gut supplements.
• The clinical evidence behind fermented turmeric and its 550+ active metabolites.
• The potential role of postbiotics in post-antibiotic gut recovery, skin health, and metabolic function.
• Why Dr. Fraser advocates for a "food first" approach alongside emerging microbiome therapies.

(Guest Info: Alastair Jessel is the founder of AYA BIOME™ and publishes commentary on the gut health industry via his Substack, @amanofkent.)

Scientific References & Further Reading:

• Braga, J. D., et al. (2024). Gamma-aminobutyric acid as a potential postbiotic mediator in the gut-brain axis. Science of Food, 8(16).
• Higova, E. (2024). Postbiotics as metabolites and their biotherapeutic potential. International Journal of Medical Sciences, 25, 5441.
• Liang, B., & Xing, D. (2023). The current and future perspectives of postbiotics. Probiotics and Antimicrobial Proteins.
• Ma, L., et al. (2023). Postbiotics in human health. Nutrients, 15, 291.
• The Postbiotic Company. Research, Clinical Studies & Trials.

This podcast is brought to you in collaboration with the British Society of Lifestyle Medicine.

Disclaimer: The content in this podcast is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your doctor or qualified healthcare provider. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast.