The Peptide PhDs 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.

In part 2 of our Hallmarks of Aging series, the PeptidePhDs are back on the case — detective hats, zombie cells, muscle talk, and all. This episode dives into five more biological “clues” behind aging.

From proteins that stop folding properly to cells thatforget how to take out the trash, the conversation makes complex aging science feel surprisingly approachable.

The star of the episode? Movement. Again and again,muscle shows up as a major player in healthy aging — supporting metabolism, mitochondrial function, immune communication, and overall resilience.

And yes, they also tackle “zombie cells” — thoseretired-but-still-loud cells that refuse to leave the party and stir up inflammation.

Science over scrolling, peptides over procrastination, and one more reminder that moving your body might just be one of the best anti-aging strategies we have.

Ever wonder why we age... at the cellular level? Have you ever heard of "zombie cells"? Well, you should, because they’re currently throwing a party inside your body—and they didn't invite you.

This week, Dr. Mark and Dr. Alan kick off a brand-new series breaking down the 12 Hallmarks of Aging—the definitive, science-backed framework researchers use to decode how and why our bodies change over time. Think of it as the ultimate user manual for your biology.

In Part 1, the docs unpack the first three culprits behind cellular aging:

•

Genomic Instability: The biological "typos" and DNA damage that quietly pile up over the years.

•

Telomere Attrition: The fraying and shortening of your chromosomes' protective end caps (think of them like the plastic tips on your shoelaces).

•

Epigenetic Alterations: How your daily lifestyle signals actually dial your gene expression up or down.

PLUS: They reveal the surprising, heavy-hitting role muscle plays in putting the brakes on all three. (Spoiler alert: strength training isn't just for aesthetics anymore; it’s cellular health insurance.)

Oh, and the cellular clock isn't the only thing hitting major milestones. Dr. Alan officially walked the stage for his doctorate this week! Drop a comment to say congrats, Dr. Jones! 🎓🎉

Has Dr. Jones been replaced?! With him away in Barcelona, Dr. Mark flies solo—luckily, Crystal is here to keep him honest!

This week, we're diving into a major Science News article asking the big questions: Are peptides truly proven health aids, and is the FDA about to open the door regardless? We break down the facts to give you a clear, science-backed perspective on the future of the industry.

Plus, coming off an amazing session with our affiliate community, we're tackling your real-world questions on natural vs. synthetic peptides and how they actually work.

Tune in for a fun, science-packed episode!

The mitochondria is the powerhouse of the cell. Great. Now that we’ve cleared high school biology, let’s talk about why you’re actually exhausted.

Most people think "low energy" is just a sleep deficit. Spoiler alert: It’s usually not. In this episode, Dr. Mark Bartlett and Dr. Alan Jones go sub-atomic to show you what’s really happening inside your engine.

We’re breaking down:

•

The ATP Blueprint: How your cells actually build fuel.

•

The Nutrient Gap: Why eating food isn’t the same as having energy.

•

The Movement Paradox: Why a workout can charge your battery instead of draining it.

•

Brain vs. Body: Is it fatigue, stress, or just a lack of "get up and go"?

Stop running on fumes and start connecting the dots.

"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."

Dr. Mark Bartlett and Dr. Alan Jones are back on the Peptide PhD Podcast to remind us that weight loss is great, but muscle is better.

They continue their deep dive into body recomposition and why building and keeping muscle matters way more than just losing weight. In this episode, they break down the essentials: high-quality protein, the magic of deep sleep, and the risk of losing "the good stuff" while on GLP-1 medications.

Plus, they dive into a brand new study proving that muscle health is heart health. If you’re serious about aging strong and staying independent (and being the strongest person in the retirement community one day), this is a must-listen!!

Stop letting a piece of bathroom floor plastic gaslight you every morning.

In this episode, Dr. Mark and Dr. Alan break down why "losing weight" and "getting healthy" aren't always on speaking terms. If you’ve ever hit your goal weight only to realize you still feel like a bag of smashed potatoes, this one is for you.

The highlights:

Why body composition is the metric that actually matters (and why the scale doesn't know the difference between fat and hard-earned muscle).

Muscle is an Organ: It’s not just for the beach; it’s your body’s most underrated endocrine organ.

The GLP-1 Fine Print: Rapid weight loss comes with a "tax." We look at what the research actually says about the trade-offs of the latest weight-loss trend.

The "Secret" Basics: A deep dive into nutrient deficiencies, why protein timing is a game-changer, and why your "sleep architecture" matters more than just hitting the snooze button.

"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 consult your physician or other qualified health provider with any questions you have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast."

Turns out, "Pirate’s Disease" isn't just for 17th-century sailors on wooden ships. This week, we’re breaking down why your modern weight loss journey shouldn't leave you looking like a scurvy soldier.

In this episode, we cover:

•

The GLP-1 Nutrition Gap: "Yo ho ho" and a bottle of... Vitamin C? Why intense appetite suppression requires a serious strategy for protein and micronutrients.

•

Muscle Preservation: Because "skinny" shouldn't come at the cost of your strength.

•

The Brain’s "Silent Janitor": Meet the Glymphatic System. He mops up your brain’s metabolic mess while you dream, but he only shows up for the night shift if you're actually in deep sleep.

•

Restoration > Sedation: Being "knocked out" by a pill isn't the same as a deep clean. If the janitor doesn't have the right tools, the mental cobwebs stay put.

The bottom line: Peptides aren’t magic spells; they’re precision tools that work best when you support your body’s natural chemistry.

If you’re ready to choose science over scrolling, this episode is for you!

*"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."