Fix Leaky Gut, Boost Testosterone & Slash Endotoxins with Spore-Based Probiotics | Kiran Krishnan

Your bad gut bacteria might be the reason your testosterone, your immune system, and even your sperm count are struggling, and most probiotics never survive long enough to fix it. This episode reveals which strains actually make it through your stomach acid alive, and what happens once they do.

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Host Dave Asprey sits down with research microbiologist Kiran Krishnan, co-founder of Microbiome Labs, the leading microbiome therapeutics brand among healthcare professionals. He has published multiple peer-reviewed studies, holds global patents, and has spent 20 years building companies focused on the science of the microbiome. His work centers on spore-based probiotics, the rare strains proven to survive the stomach's brutal acidity and actually rebuild the gut from the inside out.

Kiran and Dave break down why 98 percent of conventional probiotics die before they ever reach your gut, and why spore-forming bacteria are different. They dig into the "gelding effect," the well-documented pathway where endotoxins from bad gut bacteria shut down testosterone production and drive up cortisol, and how fixing your microbiome can reverse it. They cover the connection between endotoxemia and nearly every major marker of aging, metabolism, and inflammation, why butyrate acts like a natural GLP-1 for fat loss, how Akkermansia can upregulate mitochondria and improve blood sugar control, and the surprising role vitamin K2 plays in bone density and functional medicine. This is biohacking at the cellular level, using ancient biology, fasting-adjacent metabolic pathways, and precision supplementation to optimize human performance from the gut up.

You'll Learn:

Why 98 percent of probiotics die in your stomach before they ever work
What the "gelding effect" is and how gut bacteria can shut down testosterone
How endotoxins drive inflammation, cortisol, and accelerated aging
Why butyrate functions like a natural, low-cost alternative to GLP-1 drugs
How Akkermansia improves mitochondrial function and blood sugar control
The overlooked link between your microbiome and vitamin K2 production
Why spore-based probiotics can survive gastric acid when most others cannot
How 90 days of gut repair can measurably reduce circulating endotoxins

Keywords: best probiotics that survive stomach acid, spore based probiotics benefits, gelding effect testosterone, endotoxins and testosterone, how to lower endotoxins, LPS gut bacteria, Akkermansia GLP-1 natural, gut bacteria and belly fat, vitamin K2 bone density, Kiran Krishnan microbiologist, Just Thrive probiotic, leaky gut symptoms, microbiome and testosterone, fecal transplant benefits, Dave Asprey, biohacking, longevity

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Timestamps:

00:00 – Trailer

00:38 – Kiran Intro

02:01 – Stomach Acid & Probiotics

05:25 – Fauci & Spore Bacteria

13:58 – Losing Gut Diversity

19:01 – How Butyrate Is Made

22:11 – Dave's Personal Stack

24:00 – Quorum Sensing

31:26 – Endotoxins Explained

37:13 – Charcoal & Binders

39:41 – SIBO & Gut Bacteria

45:03 – Discovering Vitamin K2

49:33 – Gelding Effect & Testosterone

54:51 – Akkermansia & Weight Loss

01:02:17 – Role of Bitters

01:04:47 – Just Thrive Gift

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