The Dr. Layne Norton Podcast

In this episode, Dr. Layne Norton sits down with Professor Bill Campbell, PhD — Director of the Performance & Physique Enhancement Laboratory at the University of South Florida and a leading researcher on body composition, high-protein diets, and resistance training adaptations.
They discuss Bill’s high-protein studies in women (including physique athletes, contest prep, older adults, and time-restricted eating), sex differences in muscle growth and training adaptations, the menstrual cycle’s impact on performance, intermittent energy restriction, refeeds and diet breaks, and one major belief he completely changed his mind on (meal frequency).
Packed with practical, evidence-based insights on optimizing body composition, fat loss, and strength.

SPONSORS
• Workout Builder – Customized training programs for all experience levels: https://biolayne.com/workout-builder
• Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching

LAYNE'S COMPANIES
Carbon Diet Coach: https://joincarbon.com/podcast
Outwork Nutrition: https://outworknutrition.com
REPS Research Review: https://biolayne.com/reps
Workout Builder: https://biolayne.com/workout-builder
Team Biolayne: https://biolayne.com/online-coaching
Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE
http://www.facebook.com/laynenorton
http://www.twitter.com/biolayne
http://www.instagram.com/biolayne

TIMESTAMPS
0:00:00 - Intro
0:02:53 - Career History
0:10:58 - What is the Focus of Your Lab?
0:15:48 - Physique Coaching Academy
0:16:49 - High vs Low Protein Study
0:36:45 - REPS Research Review
0:40:19 - Animal vs Human Studies
0:43:22 - Importance of Leucine
0:45:55 - Arginine & Growth Hormone
0:49:14 - Should Women Train Differently
0:54:34 - Device Trackers vs Subjective Feelings
0:57:38 - Squats
1:04:48 - Injuries
1:07:41 - Training Volume
1:13:30 - Refeeds and Diet Breaks
1:32:32 - Meal Frequency
1:36:25 - Outro

SHOW NOTES
https://biolayne.com/podcasts/dr-layne-norton-podcast/

In this listener Q&A, Layne dives deep into your most-asked questions on training, nutrition, and practical science. As always, he breaks down the actual research and gives no-BS, evidence-based takeaways you can actually use.
Topics covered in this episode:
• Does cortisol cause fat gain? Plus the impact of low-calorie dieting on cortisol
• Sucralose and gut health – new research on dysbiosis, glucose/insulin levels, and the role of Blautia
• Do seed oils increase inflammation? Comprehensive look at linoleic acid studies, systematic reviews, and clinical trials
• Insulin, high-glycemic carbs, and fat storage – what do overfeeding studies actually show?
• Is “natural” always better? The naturalistic fallacy explained
• Is resistance training safe and effective for kids? What the science says for youth training
• Creatine dosing for women vs. men – do women need a different amount?
• Does cardio interfere with building muscle? Latest meta-analyses on concurrent training
• Layne’s honest take on The Biggest Loser Netflix documentary
• And more!
Whether you’re chasing muscle gains, fat loss, or just cutting through the noise, this episode delivers the science-backed answers.

SPONSORS
• REPS - Research Explained in Practical Summaries: https://biolayne.com/reps
• Workout Builder – Customized training programs for all experience levels: https://biolayne.com/workout-builder

LAYNE'S COMPANIES
Carbon Diet Coach: https://joincarbon.com/podcast
Outwork Nutrition: https://outworknutrition.com
REPS Research Review: https://biolayne.com/reps
Workout Builder: https://biolayne.com/workout-builder
Team Biolayne: https://biolayne.com/online-coaching
Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE
http://www.facebook.com/laynenorton
http://www.twitter.com/biolayne
http://www.instagram.com/biolayne

TIMESTAMPS
0:00:00 - Intro
0:01:08 - Bulking/Cutting vs Recomp?
0:08:00 - Does Cortisol Cause Fat Gain?
0:11:51 - REPS Research Review
0:12:41 - Does Sucralose Harm Your Gut?
0:15:42 - Do Seed Oils Cause Inflammation?
0:21:24 - Insulin and Fat Storage?
0:25:48 - Workout Builder
0:26:43 - Is Natural Always Better?
0:31:42 - Can Women Over 60 Grow Their Glutes?
0:33:31 - Is Resistance Training Healthy for Kids?
0:35:53 - Dosing Creatine for Women vs Men?
0:37:00 - Stacy Sims Content?
0:40:30 - Alcohol and Body Composition?
0:42:45 - Does Cardio Interfere with Building Muscle?
0:45:57 - Thoughts on New Biggest Loser Documentary?
0:54:04 - Outro

SHOW NOTES
https://biolayne.com/podcasts/dr-layne-norton-podcast/

In this episode, Dr. Layne Norton interviews Professor Jeremy Loenneke — one of the world’s top researchers on blood flow restriction training. They break down how BFR actually works, why metabolite accumulation appears to be the primary driver of its muscle-building effects, practical self-application techniques, and whether expensive cuffs are even necessary.
Jeremy also shares his latest thinking on the hypertrophy vs. strength relationship, why muscle may be an underrated health marker (just like fat once was), his biggest concerns about the replication crisis in exercise science, and how he responds to critics who call BFR “gimmicky.”
Whether you’re an athlete chasing gains, a coach, or just training smarter, this is a must-listen deep dive into the science and real-world application of BFR.
SPONSORS
• Workout Builder – Customized training programs for all experience levels: https://biolayne.com/workout-builder
• Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching
LAYNE'S COMPANIES
Carbon Diet Coach: https://joincarbon.com/podcast
Outwork Nutrition: https://outworknutrition.com
REPS Research Review: https://biolayne.com/reps
Workout Builder: https://biolayne.com/workout-builder
Team Biolayne: https://biolayne.com/online-coaching
Physique Coaching Academy: https://physiquecoachingacademy.com
FOLLOW LAYNE
http://www.facebook.com/laynenorton
http://www.twitter.com/biolayne
http://www.instagram.com/biolayne
TIMESTAMPS
0:00:00 - Intro
0:05:27 - Background on BFR
0:12:30 - BFR Effects
0:18:38 - BFR Protocols
0:23:18 - Workout Builder
0:24:14 - Preferences = Consistency
0:28:36 - BFR and Injuries
0:31:39 - BFR vs Regular Training
0:41:57 - Mechanisms
1:04:51 - Team Biolayne
1:05:43 - Training to Failure
1:10:50 - Don’t Get Stuck in the Details
1:16:35 - BFR Safety
1:20:41 - Recommendations to Start
1:27:30 - Strength vs Hypertrophy
1:49:58 - Study Design & Replication
2:04:14 - Final Question
2:15:52 - Outro

SHOW NOTES
https://biolayne.com/podcasts/dr-layne-norton-podcast/

It’s here—the last episode of Dr. Layne Norton’s no-nonsense supplement series! In this finale, Layne takes a hard, evidence-based look at some of the most overhyped supplements in fitness and bodybuilding. He cuts through the marketing claims, examines the actual research, and tells you exactly what works, what doesn’t, and who (if anyone) should actually be spending money on these products.
In this episode, Layne covers:
BCAAs – Do they build muscle, boost strength, or speed recovery more than just eating enough total protein?
HMB – Why the “like deca” claims from the ’90s never panned out, and what it actually does (and doesn’t) do
Glutamine & Arginine – Poor bioavailability, gut-first metabolism, and why they rarely deliver the muscle-building or performance benefits promised
Ecdysterone & Turkesterone – The “natural steroid” hype meets high-quality human RCTs
Electrolytes – When they actually matter (and when plain water is sufficient)
“Better” Creatine forms (CEE, buffered creatine, HCl, etc.) vs. good old Creatine Monohydrate – spoiler: you’re usually just paying 2–4× more for the same (or worse) results

Layne breaks down the bold claims vs. reality for each supplement, explains what the science shows they actually do in the body, and identifies the very narrow populations who might see real benefit.
Stop wasting money on supplements that underdeliver. Focus on what actually moves the needle.

SPONSORS
• Outwork Nutrition - Evidence-Based Supplements to Support Your Hard Work: https://outworknutrition.com
• Carbon Diet Coach – 14 day free trial: https://joincarbon.com/podcast

LAYNE'S COMPANIES
Carbon Diet Coach: https://joincarbon.com/podcast
Outwork Nutrition: https://outworknutrition.com
REPS Research Review: https://biolayne.com/reps
Workout Builder: https://biolayne.com/workout-builder
Team Biolayne: https://biolayne.com/online-coaching
Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE
http://www.facebook.com/laynenorton
http://www.twitter.com/biolayne
http://www.instagram.com/biolayne

TIMESTAMPS
0:00:00 - Intro
0:03:10 - BCAAs
0:11:38 - HMB
0:19:46 - Glutamine
0:24:56 - Arginine
0:31:10 - Ecdysterone and Turkesterone
0:34:18 - Electrolytes
0:42:32 - Alternate Forms of Creatine
0:51:03 - Honorable Mentions
0:55:42 - Outro

SHOW NOTES
https://biolayne.com/podcasts/dr-layne-norton-podcast/the-most-overhyped-supplements-of-all-time-episode-24

The Dr. Layne Norton Podcast is back with Part 2 of the highly anticipated Supplement Series! In Episode 23, Layne dives deep into his Tier 2 supplements — the ones with solid (but not quite elite) evidence for supporting strength, power, endurance, recovery, body composition, stress management, sleep, and overall training performance.
Building on the Tier 1 foundations from Episode 22 (creatine, whey protein, and caffeine), Layne breaks down the science, mechanisms, optimal dosing, timing, safety profiles, and real-world takeaways for these promising options. No hype, just evidence-based insights to help you decide what's worth adding to your stack.
In this episode, Layne covers:
Ashwagandha — Boosts strength, lean mass, testosterone, recovery, sleep, and stress management as a powerful adaptogen.
Betaine (Trimethylglycine) — Potential improvements in body composition, strength, power output, and recovery.
Rhodiola Rosea — Enhances resistance training performance, endurance, VO2 max, fatigue resistance, recovery, and cognition.
Citrulline (including Citrulline Malate) — Increases muscular endurance, reps to failure, nitric oxide production, and reduces fatigue.
Beta-Alanine — Buffers acidity for better performance in high-intensity efforts (1–10 minutes), more reps in resistance training.
Tart Cherry Extract — Reduces DOMS, speeds strength/power recovery, and lowers inflammation/oxidative stress markers.
Melatonin — Improves sleep quality (with indirect benefits for body composition and recovery via better rest).
Taurine — Supports endurance, acute power/strength, and recovery from muscle damage/DOMS.
Carnitine — Aids recovery, reduces soreness, boosts power/volume, and may enhance high-intensity performance.
Magnesium — Benefits exercise performance, recovery, and sleep — especially if you're deficient.
Layne references key studies, meta-analyses, practical dosing protocols, side effects to watch for, and who might benefit most.
Whether you're chasing PRs, better recovery, or optimized health, this episode cuts through the supplement noise with Layne's no-BS, science-first approach.
SPONSORS
• Outwork Nutrition - Evidence-Based Supplements to Support Your Hard Work: https://outworknutrition.com
• David Protein - Buy 4 cartons, get 1 FREE at: https://davidprotein.com/pages/layne
LAYNE'S COMPANIES
Carbon Diet Coach: https://joincarbon.com/podcast
Outwork Nutrition: https://outworknutrition.com
REPS Research Review: https://biolayne.com/reps
Workout Builder: https://biolayne.com/workout-builder
Team Biolayne: https://biolayne.com/online-coaching
Physique Coaching Academy: https://physiquecoachingacademy.com
FOLLOW LAYNE
http://www.facebook.com/laynenorton
http://www.twitter.com/biolayne
http://www.instagram.com/biolayne

TIMESTAMPS
0:00:00 - Intro
0:04:05 - Conflict of Interest
0:05:17 - Ashwagandha
0:13:52 - Outwork Nutrition
0:15:28 - Betaine
0:20:59 - Rhodiola Rosea
0:25:04 - Citrulline
0:30:46 - David Protein
0:32:21 - Beta-Alanine
0:37:26 - Tart Cherry
0:42:18 - Melatonin
0:45:24 - Taurine
0:47:24 - L-Carnitine
0:51:35 - Magnesium
0:54:34 - Outro

SHOW NOTES
https://biolayne.com/podcasts/dr-layne-norton-podcast/supplement-series-tier-2-episode-23