The 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

The Dr. Layne Norton Podcast is back with the start of a brand-new Supplement Series! In Episode 22, Layne kicks things off by diving deep into his Tier 1 supplements — the ones with the strongest scientific evidence for real-world benefits in performance, body composition, strength, recovery, and even cognition.
This episode covers the true MVPs that Layne considers essential (or close to it) for most people training hard:
Creatine Monohydrate — Why it's called the most effective ergogenic aid ever, how it boosts lean mass, strength, repeated sprint/power performance, and even helps cognition (especially under stress like sleep deprivation). We bust myths about kidneys, water retention, and non-responders, plus practical dosing (5 g/day, loading optional).
Whey Protein — The gold-standard for hitting leucine thresholds and maximizing muscle protein synthesis. How it supports lean mass gains, preserves muscle in a deficit, improves recovery and training volume over time — and why total daily protein matters way more than perfect timing.
Caffeine — One of the most reliable acute performance boosters out there. It cranks up strength, power, endurance, repeated sprints, alertness, and reduces perceived effort — especially when fatigued. We cover optimal dosing (3–6 mg/kg), timing, habituation, sleep trade-offs, and who should be cautious.
Layne breaks down the mechanisms, key meta-analyses, practical takeaways, dosing/timing strategies, safety profiles, and who might need to be careful with each one. No hype, no BS — just evidence-based insights to help you cut through the supplement noise.
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
0:01:24 - Tier 1 Supplement List
0:02:25 - Industry Shenanigans
0:04:01 - Tier 1 Criteria
0:04:56 - Conflicts of Interest
0:09:10 - How Creatine Works
0:13:09 - Creatine Physical Benefits
0:19:55 - Outwork Nutrition
0:21:22 - Creatine Physical Benefits Contd.
0:23:48 - Creatine Cognitive Benefits
0:27:23 - Creatine Safety
0:30:51 - Forms of Creatine
0:32:18 - How to Take Creatine
0:34:15 - Creatine Non-Responders
0:35:19 - Misc Considerations
0:36:11 - Whey Protein Quality
0:38:04 - Muscle Protein Synthesis
0:39:09 - Whey Protein Research
0:40:00 - Protein Intake
0:42:27 - Protein Health and Safety
0:43:16 - Forms of Whey Protein
0:47:13 - Whey Protein Dosing
0:49:05 - Misc Considerations
0:50:42 - Carbon Diet Coach
0:51:42 - How Caffeine Works
0:53:23 - Research Outcomes
0:57:03 - Timing/Dosing
0:57:30 - Cognitive Effects
0:58:06 - Health Considerations
0:58:57 - Training Recommendations
1:00:44 - More Dosing
1:03:11 - Caffeine + Creatine
1:04:18 - Misc Considerations
1:05:10 - Closing Thoughts
1:06:21 - Outro

SHOW NOTES
https://biolayne.com/podcasts/dr-layne-norton-podcast/supplement-series-tier-1-episode-22

In this episode, I’m joined by James Krieger, editor of REPS (Research Review for Exercise & Physique Science), to break down what the meta-analyses really say about building muscle.
We cover:
• The single most important driver of hypertrophy
• The dose–response relationship between volume and muscle growth
• Is there a cap to effective volume?
• Training to failure: necessary or overrated?
• Frequency: how often should you train a muscle?
• Stretch-mediated hypertrophy and long-length partials
• Why some volume studies appear to “disagree”
If you’re tired of social media hot takes and want to understand what the totality of evidence actually shows, this episode is for you.
James and I also discuss how we evaluate research quality and why context matters when interpreting studies, something we do every month inside the issues of REPS, where we break down the latest exercise and physique research so you don’t have to.
If you want deeper dives into the actual studies discussed in this episode (and many more), check out REPS at https://biolayne.com/reps
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
0:02:39 - James Background
0:04:01 - OG Message Boards
0:06:24 - Who To Listen To
0:15:01 - REPS
0:15:53 - Hypertrophy
0:26:02 - Compound vs Isolation Movements
0:33:05 - Subjective Feelings on Training
0:37:50 - Training Flexibility
0:43:22 - Training Volume
0:47:05 - Defining Sets
0:51:59 - Volume Analysis
1:02:27 - Research Challenges
1:08:12 - Workout Builder
1:09:08 - Study Discrepancies
1:16:55 - High vs Low Volume
1:22:40 - Time Constraints
1:25:15 - Volume Cycling
1:30:11 - Volume Adaptation
1:34:37 - Range of Motion
1:44:35 - What Have You Changed Your Mind On
1:59:36 - Outro

SHOW NOTES
https://biolayne.com/podcasts/dr-layne-norton-podcast/the-science-of-muscle-building-with-james-krieger-episode-21

In this episode, Layne Norton, PhD, dissects the landmark 2025 systematic review & meta-analysis in Advances in Nutrition: "The Effects of Aspartame on Glucose, Insulin, and Appetite-Regulating Hormone Responses in Humans". (PMID: 40381807)
This episode is perfect if you've heard claims like "diet soda spikes insulin," "artificial sweeteners cause diabetes," or "aspartame is toxic" — Layne uses this gold-standard review to separate science from fear-mongering.
If you're into evidence-based nutrition, skeptical of viral health scares, or just want to know if your Diet Coke habit is secretly wrecking your metabolism — this episode has the receipts.
Subscribe for more deep-dive breakdowns of the latest research, and drop a comment: Do you use aspartame? Has this changed your view?
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
0:02:53 - What is Aspartame
0:05:15 - Health Claims
0:11:26 - How Aspartame is Metabolized
0:14:15 - HRCTs
0:15:56 - Outwork Nutrition
0:18:06 - Study Overview
0:19:25 - Inclusion Criteria
0:31:43 - Results
0:40:38 - David Protein
0:42:13 - Results Cont.
0:49:51 - Discussion
0:58:53 - Conclusion

SHOW NOTES
https://biolayne.com/podcasts/dr-layne-norton-podcast/study-deep-dive-does-aspartame-increase-insulin-episode-20