Advertise on podcast: The Peptide PhDs Podcast

Your brain has all day to think about unfinished projects. Naturally, it chooses 3 a.m. This week, Dr. Mark Bartlett and Dr. Alan Jones explore the relationship between stress, cortisol, and sleep, breaking down a newly published rice-peptide pilot study and what its findings suggest about sleep initiation, quality, and mood. And because this is The Peptide PhDs, the conversation takes an unexpected detour into ancient poop. Discover how AI is helping researchers identify antimicrobial peptide candidates from ancient gut microbiomes, and what those discoveries could teach us about the microbes we carry today. Sleep science, biological detective work, and a few jokes that probably should have stayed buried. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

The peptide superhero universe is back because apparently, saving the day takes more than one episode. This week on The Peptide PhDs, we're continuing our journey from survival to superpower, introducing a few new molecular heroes with some pretty impressive abilities. We're also diving into the world of peptide antiheroes, exploring the differences between natural and synthetic peptides and why more powerful doesn't always mean better. From cellular signaling to the latest technology helping scientists uncover peptides in nature, we're breaking down the science with a little humor, a few questionable superhero references, and plenty of reasons to keep listening. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

A muscle-building superhero from a fava bean. A K-pop-inspired peptide protecting your body's appetite signals. And a brown rice heroine trying to convince cortisol that it's officially bedtime. Sounds like a superhero movie nobody asked for, right? This week on The Peptide PhDs, we're exploring the fascinating world of cellular signaling and the science behind three naturally derived peptides. From supporting muscle protein synthesis and understanding GLP-1's role in appetite to exploring how cortisol influences our sleep cycles, we're connecting the dots between tiny molecules and some pretty important biological processes. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

Remember when fitness was all about endless cardio, tiny pink dumbbells, and avoiding muscles at all costs? Yeah, we might owe our bodies an apology. In this episode of The Peptide PhDs, Dr. Mark welcomes his wife, Crystal, for a conversation that connects emerging peptide science with the everyday realities of health and wellness. They unpack the difference between losing weight and losing fat and why maintaining muscle could play a critical role in healthy aging. But the conversation doesn't stop at the gym. Expect scientific insights, personal stories, and enough husband-and-wife banter to prove that chemistry isn't just something you study in a lab. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

A tiny peptide. Stomach acid. Digestive enzymes. A whole lot of molecular scissors. So, what actually happens during digestion? In this episode of The Peptide PhDs, Dr. Mark and Dr. Jones tackle one of the biggest questions surrounding natural peptides: Can they actually survive digestion? With a little help from “Dora the Peptide,” they follow the journey from the stomach to the small intestine, through potential transport pathways, and ultimately toward the receptors where the real work happens. Along the way, they break down how peptide sequence, proline, disulfide bonds, structure, and even digestion itself can help certain peptides remain active. It’s part science lesson, part adventure movie, and proof that when it comes to biology, tiny messengers can have quite the journey. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

Muscle has apparently been running a group chat with the rest of your body this entire time, you might have just had it on mute. This week, The Peptide PhDs dive into the surprisingly chatty world of muscle. Active muscle can release hundreds of chemical messengers called myokines, communicating with everything from your brain and bones to your immune system and metabolism. The guys break down what happens when you stop using muscle, why maintaining it becomes so important as you age, and how resistance training, protein and sleep all factor into keeping what you’ve got. They also tackle GLP-1s, muscle loss, sarcopenia and the emerging science around naturally occurring bioactive peptides that may help support muscle signaling. Basically: your muscles have a lot to say. You might want to listen. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

Peptides usually get talked about for things like sleep, muscle, skin and metabolism. This week? Rattlesnakes and deadly spiders enter the chat. The Peptide PhDs explore the surprisingly wild side of peptide science, from venom and nature-made defense systems to the discoveries that have helped inspire modern peptide research. They also break down why peptide sequence, target and half-life matter, and why “natural” doesn’t automatically mean harmless. Plus, they dive into a new hibiscus-derived peptide, what makes it unique and how its signaling may help support healthy skin structure. It’s science, survival stories and a healthy reminder that peptides may be small, but biology definitely listens when they speak. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

You did it. You are about to know about everything beauty! This episode of The Peptide PhDs breaks down how collagen gives skin structure, elastin provides bounce, hyaluronic acid helps with hydration, and peptides act like tiny text messages telling skin cells what to do. They also cover what ages skin from the inside out, and it's, well, it's exactly what might think it is; oxidative stress, too much sugar, and overactive “demolition crew” enzymes called MMPs (don't worry, they will tell you what that means). Bottom line: great skin isn’t just about what you put on it. It’s about supporting the biology underneath it. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

The Peptide PhDs are back for round 2 of their deep dive into beauty. Apparently, skin has a language, but it is not fluent in expensive moisturizer. In this episode, the Peptide PhDs explore how collagen fragments and bioactive peptides act as biological messages, telling the skin’s fibroblasts when it is time to repair, rebuild, and remodel. They unpack the science behind a smarter skin-support strategy: peptides provide the signal, plant compounds help preserve the matrix, and amino acids, vitamin C, minerals, and hyaluronic acid amplify the rebuilding process. They will explore clinical findings on collagen production, elastin, elasticity, and visible wrinkles. Plus, you'll have a front row seat to their collection of jokes involving E.T., almonds, frogs, and alligators that probably should not have survived peer review. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

What if we told you, in this episode, Dr. Jones and Dr. Mark are talking about tanning and new clothes? Don't worry, our PhDs aren't out on the town going for a new look. No, in this episode of The Peptide PhDs, they are talking about a different outward appearance: the skin. Our skin is more than just stuff holding other stuff in, and it's certainly more complicated than what's happening in your bathroom cabinet. In part one of our two-part series, the guys peel back the layers to explore the living, constantly remodeling organ that is our skin. They talk about the epidermis, dermis, collagen, elastin, fibroblasts--it's an all-out coverage of everything skin. Beauty may show up on the surface, but the real work is happening underneath it all. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

What do our founding fathers and peptide signaling have in common? More than you might think. In this special Independence Day episode, Dr. Mark and Dr. Allen dive into myokines, metabolism, muscle, and modern peptide science. Along the way, they explore why muscle is the currency of healthy aging, how sleep and nutrition keep your internal communication systems firing, and why the most powerful health tools still require a little old-fashioned personal responsibility. Expect founding-father stories, a journey from muskets to molecules and an honest conversation about the responsible use of modern peptide science. Two hundred and fifty years ago, America declared its independence. In this episode, the Peptide PhDs ask a new question: How do we maintain our physical independence as we age? "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

Protein is having a moment—and, as usual, social media has made things complicated. Are you eating too little, consuming too much, or just aggressively shaking powder into a bottle and hoping for the best? In this episode, the Peptide PhDs get under the hood of protein to explore what actually matters: amino acids, digestibility, leucine, muscle protein synthesis, and why two foods with the same number of protein grams may not deliver the same results. They also tackle the plant-versus-animal showdown, explain why aging muscles may need a little extra seduction, and share practical ways to get more high-quality protein onto your plate. From GLP-1s and healthy aging to kidney myths, mTOR panic, and the supposedly sacred 30-gram protein limit, nothing is safe from scientific scrutiny—or a well-timed protein pun. It’s smart, practical, slightly cheeky, and packed with information your muscles will absolutely eat up. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

This week, The Peptide PhDs are putting your brain on peptides—and no, this is not another scrambled-egg public service announcement. Dr. Mark Bartlett and Dr. Alan Jones break down how peptides and amino acids help create a communication network between the brain and the rest of the body. From the gut-brain axis to inflammation, stress, sleep, nutrition, and muscle signaling, your brain is receiving far more messages than most of us realize. The pair also digs into emerging research on apelin, a muscle-derived signaling molecule that may help explain why exercise can have such a powerful effect on mood and brain function. By the end, one thing is clear: exercise is doing a lot more than burning off lunch. Every walk, hill climb, bike ride, and resistance-training session may be sending valuable messages to your brain. In other words, your muscles are talking—so perhaps it is time to give them something interesting to say. "The information discussed on this podcast is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

After a long hiatus, we're back! Dr. Mark and Dr. Alan dive into body composition—aka why the number on the scale is not the whole story, and sometimes not even the right story. Come unpack the difference between weight loss and improving the ratio of lean muscle to body fat, explaining how muscle acts like a metabolic engine while excess visceral fat can drive inflammation, insulin resistance, and long-term health risks. (Basically, your bathroom scale may be dramatic, but your muscle-to-fat ratio is the real plot twist.) The conversation also explores why maintaining muscle mass is one of the biggest keys to aging well, improving health span, and reducing mortality risk. With a mix of research, real-world examples, and a little classic Peptide PhDs banter, this episode makes a strong case for building muscle, managing fat, and treating your body composition like the biological upgrade it is. From air squats to incretin signaling, this one is packed with practical takeaways: lift something, eat enough protein, protect your muscle, and maybe stop letting your couch win the tug-of-war.

In this episode of Peptide PhDs, Dr. Mark and Dr. Alan wrap up their three-part tour through the 12 hallmarks of aging by tackling the final four: stem cell exhaustion, altered cellular communication, chronic inflammation, and dysbiosis. Translation: the body’s repair crews get tired, the cellular group chat starts dropping messages, the immune system gets stuck in “red alert,” and the gut microbiome can turn from a well-tended garden into a suspicious gas-station salad bar. The big takeaway is surprisingly empowering: while no one has found the “live to 200 and still crush leg day” button, many drivers of healthy aging are influenced by daily choices. Muscle takes center stage as a major communication organ, releasing myokines that help regulate metabolism, immune balance, brain health, and repair. Resistance training, daily movement, enough protein, micronutrients, hydration, sleep, and a healthy gut microbiome all help reduce biological “static” and give the body’s repair systems a fighting chance. In short, aging may be inevitable, but frailty does not have to RSVP early and your mitochondria would probably appreciate a walk after lunch.