“ We already know the biggest levers. Nutrition, sleep, movement, connection, sunlight—all of those things we’ve known about for decades and they’re not sexy, but they work. Even novel gadgets are just an add-on to these big buckets.” ~ Dr. Karan Rajan
➡ From YouTube to TikTok: Dr. Karan shares his 14-year journey as a content creator, explaining why he sees himself as an “educator” trying to make science “sticky,” rather than an “influencer.”
➡ Blending Old and New: A discussion on how to bridge the gap between traditional, evidence-based medicine and the innovative (and sometimes unproven) world of biohacking, stressing the importance of nuance and an open mind.
➡ Supplement Skepticism: Dr. Karan breaks down the dangers of over-supplementation, the risks to your liver, drug interactions, and the minimal stack he personally takes and why.
➡ Mouth Taping Revisited: An updated and nuanced take on the controversial trend of mouth taping. Dr. Karan explains the potential benefits, the risks, who shouldn’t do it, and how to try it safely.
➡ Antibiotics & The Gut: A clear, three-phase plan (pre, during, and post) to support your microbiome and mitigate the damage when you need to take antibiotics.
➡ In this episode, host Tim Gray sits down with NHS surgeon and social media phenomenon Dr. Karan Rajan to navigate the complex world where mainstream medicine meets online wellness culture. Dr. Karan shares his long history of making educational content and his mission to provide nuanced, evidence-based knowledge in a digestible format. Together, they dive deep into the tension between established medical practice and the biohacking movement, exploring how to remain grounded in science while staying open to innovation. Listeners will come away with a refreshing, balanced perspective on health optimization and the tools to separate science from fiction.
💡 Highlights
0:00 Intro
0:53 Welcome to Dr. Karan
1:12 Why an NHS Surgeon Started Making TikToks
6:46 Why a Degree Doesn’t Mean Someone is Always Right
11:07 Bridging Mainstream Medicine and the Wellness World
16:48 The “Big Levers” of Health vs. The Extra 1% from Biohacking
20:47 The Dangers of Over-Supplementation & Protecting Your Liver
26:48 Dr. Karan Reveals the Supplements He Personally Takes
33:04 Mouth Taping: An Updated, Nuanced Stance
43:13 A 3-Phase Plan to Support Your Gut Through Antibiotics
51:51 Fiber vs. Fibers: Why Diversity is the Key to Gut Health
55:31 The Debate on Blue-Blocking Glasses
59:06 An Honest Take on Hydrogen Water
1:02:58 Rapid Fire: Harmful Trends, Fixing the NHS, and Biggest Health Wins
🔎 Follow Dr. Karan Rajan for more evidence-based health education:
Instagram: https://www.instagram.com/drkaranrajan/
TikTok: https://www.tiktok.com/@dr.karanr
YouTube: https://www.youtube.com/@DrKaran/videos
Massive thank you to OMNi-BiOTiC for sponsoring this episode!
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This is the Health Optimisation Podcast with your host, Tim Gray, the UK’s Leading Biohacker. This podcast brings you the latest in health optimisation, featuring experts and breakthroughs in nature, biohacking, technology, and longevity research. Join us to discover actionable advice for living longer and healthier.
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