A Follow-Up Challenge on Your Recent Peptides Episodes
Hi Peter, I listened to your recent episodes on peptides. Across both, you really focused on BPC-157 and CJC-1295, rather than compounds like tesamorelin and others like Reta that are already widely used in the fitness world. You did touch on SS-31, but mostly in the context of Barth disease, when in reality, people are using it for broader mitochondrial repair, and there's already evidence out there supporting that use beyond the narrow disease indication. I am by no means a Physician, but I do hold a microbiology and cell science degree from the University of Florida, and I have spent the better part of thirty years studying research and new developments in the science and supplement world, along with valuing randomized controlled trials. You raised manufacturing controls as a reason to be cautious about gray market peptides, but that argument cuts both ways. A large share of FDA approved generic drugs, and the active ingredients in many brand name drugs, are already manufactured in China and India, often in facilities that could plausibly overlap with peptide production. Pointing to overseas manufacturing as a unique red flag for peptides is a bit of a stretch when it's already baked into a huge portion of the approved drug supply. On the purity question, saying a peptide has the same amino acid chain but might not be the same compound needs some unpacking, because identical sequence does mean identical primary structure chemically. Where real variation can creep in is in synthesis byproducts, truncated fragments, or folding differences that a purity certificate should be catching. That's worth clarifying in a future episode rather than leaving as a vague caveat. Beyond BPC-157 and CJC-1295, there are roughly seventy five peptides in active use across the fitness and longevity community. AOD-9604, retatrutide, tesmorelin, thymosin alpha-1, TB-500, GHK copper, MOTS-c, selank, semax, epithalon, and 5-amino-1MQ are mainstream examples people are using with a lot of reported success, and they got essentially zero airtime on the show. I understand these need to go through proper research channels to be fully validated, but the honest question is, how long is that going to take. We could be waiting a decade while millions of people are already using them and reporting real benefit. That gap is exactly why they deserve a hard, serious look now, not dismissal until the paperwork catches up. I'd also push back on the idea that something not prescribed by a clinician can't be trusted. If a peptide comes with a certificate of authenticity confirming it's tested and pure, that addresses the same core concern a prescription is meant to address, knowing what's actually in the vial. Plenty of well regarded supplements, like TRU NIAGEN, or urolithin A from Mitopure, are widely used and trusted without a prescription. On top of that, a lot of the dosing and timing protocols people are using now aren't guesswork, they're drawn from existing clinical trials, refined by many thousands of real-world users, a far larger sample than even a large Phase 3 trial. I've lived this dynamic before. I've dealt with psoriasis in the past, and it was actually eliminated through my own routine. Along the way, I was the one researching the pipeline of upcoming drugs and treatments, and bringing specific options to my doctor to try, not the other way around. That experience taught me that patients can be capable, informed advocates for their own care, and I'm applying that same approach to peptides now. I can offer my own results as data. I plateaued around 180 lbs for a year or two despite consistent training and a healthy diet. After adding retatrutide and then tesamorelin 6 weeks later, I lost nearly fifteen pounds, increased lean muscle mass, and dropped body fat by over five percentage points within 3 months. My hypothesis was straightforward and falsifiable by your own standard. I predicted that adding retatrutide and tesamorelin would break my plateau and produce measurable fat loss and muscle gain. That's exactly what happened. It wasn't a vague feeling, it was a testable prediction that turned out to be correct. One more nuance: response to these compounds varies by baseline fitness. Someone already well trained and lean might only see a five to ten percent benefit, but dismissing that as minimal misses the point, since that margin is often exactly what people are chasing. I agree that regulation matters and anecdote isn't proof. But when millions of Americans are already using these compounds and the medical establishment's stance is largely wait for approval, that gap between real-world use and formal validation is itself worth more airtime, not less. Creatine is a good example. I've taken it since I was seventeen, long before the science and mainstream medical opinion fully caught up to what athletes already knew worked. I'd be genuinely interested in a future episode that goes deeper on tesamorelin, retatrutide, and this wider list, beyond the general framework. Thanks for the work you do translating complex science for a general audience. Roman Rudzik 407-970-6243 nycroman@msn.com
Sedation during colonoscopy (re: episode on colorectal cancer screening)
In your episode on colorectal cancer screening, you mentioned receiving sedation during your colonoscopy. I had a colonoscopy a few years ago while fully awake, without sedation or pain medication, and experienced no pain. Does the absence of sedation affect the quality or completeness of the examination—for example, the endoscopist’s ability to reach the cecum, spend sufficient time inspecting the colon, or detect adenomas—or is sedation primarily a matter of patient comfort? Assuming the procedure was completed and bowel preparation was adequate, is there any reason to question the quality of an unsedated colonoscopy?
peptides
Can you describe what these items do? They are currently available online from china but do not specify what they are for. Seems like a lot of peptides coming out: Adamax CBL-514 Dermorphin Thymosin Alpha-1 hCG (Human Chorionic Gonadotropin) GHRP-6 Acetate IGF-DES SS-31 (Elamipretide) MT-1 (Melanotan I) Mazdutide Glow (BPC-157 + GHK-Cu + TB500) Glow50 (GHK-Cu + TB500 + BPC-157) Cagrilintide + Semaglutide Bacteriostatic Water (BAC Water) CJC-1295 (Without DAC) CJC-1295 (With DAC) Ara-290 Cerebrolysin Thymalin LL-37 Survodutide Pinealon PNC27 (5 mg) PNC27 (10 mg) G610 Oxytocin Acetate HIAG CU50 + TB10 + BC10 + KPV10 Blend BPC-157 TB500 (Thymosin Beta-4 Acetate) Ipamorelin Sermorelin Acetate NAD+ BPC-157 + TB500 Blend (10 mg) BPC-157 + TB500 Blend (20 mg) Kisspeptin-10 AOD-9604 5-Amino-1MQ CJC-1295 (Without DAC) + Ipamorelin Vitamin B12 (HKB12 formulation) HGH 191AA (Somatropin) Super Human Blend Healthy Hair, Skin & Nails Blend Relaxation PM AA Acetic Acid Water Adipotide ACE031
Benefits of the Galleri test
Have had a long history (I am 81) of low PSA (1.07) and high free PSA and see a urologist 3 times a year. Obviously not high risk for prostate cancer. The Galleri test said otherwise and sure enough after my biopsy I had a Gleason score of 8. Very possible that the Galleri test will save my life.
Does food choice move inflammation — or is the "no benefit" verdict measuring the wrong variable?
In your "Should you choose organic food?" piece, you set the final gate at terminal outcomes — cancer, IQ, neurodegeneration — where dietary-exposure signals nearly vanish under long latency and confounding. But I battle chronic inflammation, and inflammation is the intermediate mechanism sitting upstream of at least three of the Four Horsemen. It would register long before any hard endpoint does. So would you tell me the foods I choose don't impact my inflammation? Or is "no measurable health benefit" partly an artifact — testing for the finished disease instead of the upstream inflammatory mediator, with an instrument like hs-CRP too noisy to catch a small chronic-exposure effect? Is the gate set at the wrong altitude, with too blunt a tool?
Bernoulli's Fallacy
I've recently finished listening to an audio book called Bernoulli's Fallacy by somebody called Aubrey Clayton, who claims that the current model of null hypothesis significance testing is logically incoherent because it ignores the prior probability of the truth of the hypothesis. He further goes on to claim that this is creating significant problems for medical research. We'd be really interested to get Peter's views on this in an AMA.
Exercise depleted sleep....
I'm a strength and conditioning coach and I usually start work at 7am, to facilitate my bike training I rise at 4am 5/day a week, walk my dog and then hop on my stationary bike for at least 30mins for a HITT & Hills ride. Even with going to sleep at 9, after having dinner and spending time with my family, I rarely hit the 6hr mark of quality sleep. My question is should I prioritize sleep over exercise(which would be very hard for me to do, LOL) or assume the reason for me not getting enough sleep by exercising outweighs the detrimental effect of being moderately sleep deprived? Thanks for your input! I've been a long time admirer & subscriber and heading into my 73rd year, so every little thing I do that can make my healthspan better I'm all in!
Living at Altitude
Hi Peter, I've really enjoyed your discussions on altitude, particularly Episode #77 on sleep at altitude, Episode #85 with Iñigo San Millán on "live high, train low," and Episode #199 with Ryan Hall, where he described growing up at altitude, training at sea level twice a week, and later sleeping at 9,400 feet in Crested Butte while preparing for marathons. I live year-round at 9,200 feet in Colorado and travel to Dallas frequently for work, so I unintentionally follow a similar "live high, train low" approach. I'm a recreational endurance athlete, running several 10Ks and a couple of half marathons each year, with an occasional marathon. Like you've discussed, I consistently see lower overnight oxygen saturation at home, my sleep feels less restorative, and my hematocrit runs around 50%. My resting heart rate and HRV often improve when I'm at lower elevation, although not always. The performance benefits of altitude seem clear, but I'm less certain about the long-term health implications. If your primary goal were maximizing healthspan rather than athletic performance, would you choose to live at 9,200 feet or at sea level for the next 30 years? How do you personally think about the tradeoff between the cardiovascular and performance benefits of chronic altitude exposure versus the potential downsides of poorer sleep, chronic nocturnal hypoxia, increased hematocrit, and sympathetic activation? Are there specific biomarkers or tests you would monitor in someone like me to know whether altitude is helping or hurting long-term health? As a second question, many friends and family from lower elevations struggle when they visit us. Even climbing a flight of stairs can be surprisingly difficult for the first day or two. We've found that hydration, pacing themselves, and even canned oxygen seem to provide some temporary relief, and I've personally found that Excedrin helps with altitude headaches. What evidence-based advice do you have for people visiting high elevations like 9,200 feet? Are there interventions—such as acetazolamide, supplemental oxygen, specific supplements, hydration strategies, or other approaches—that you think are genuinely effective, and which commonly recommended remedies are mostly placebo?
You keep mentioning progressive overload. What is it?
For someone who is 70+ what does progressive overload mean? Supposing that I can just manage 3 X15 with a weight (say 35lbs). Does that mean that I should go up to 40lb and try to do 3X10? I can certainly exhaust myself by trying 3 X16 at the old weight. So how does one manage the number of reps vs weight?
Aging Athlete- Bradycardia & heart health
I am a 57 year old female and have a low resting heart rate (50 and dips into 40s when sleeping) combined with low blood pressure 105/60. These have been my vitals for the past 10+ years as a result of cardio training (which I continue to do but not as long or vigorous as when I was younger. I do lift weights as well). I’ve read that bradycardia from athletic training can lead to afib as you age. Is that true? Are there other potential heart conditions tied to bradycardia that I should pay attention to as I age?
Adjunctive lifestyle care for people already diagnosed with cancer
Adjunctive lifestyle care for people already diagnosed with cancer is so poorly addressed: using exercise, nutrition, muscle preservation, and carefully supervised metabolic interventions to improve treatment tolerance, quality of life, recurrence risk, and longevity. can you provide some guidance in this area. It would be valuable to so many.