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FREE SHIPPING ON USA SUPPLEMENT ORDERS OVER $75USD
FREE SHIPPING ON INTL SUPPLEMENT ORDERS OVER $150USD
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Medical disclaimer: This video is for educational purposes only and is not medical advice. Peptides remain investigational and is not currently FDA approved. My personal experience is not clinical evidence or a recommendation that you use retatrutide. Speak with a qualified healthcare professional before making decisions about prescription medications or peptide based therapies.
In this episode, Funk Roberts dives deep into the world of peptides, exploring their role in fat loss, visceral fat reduction, and metabolic health for men over 40. He shares insights from his personal research, discusses specific peptides like semiglutide, trisepatide, and tesamorelin, and emphasizes the importance of understanding how these compounds work to optimize health and longevity.
00:00 Introduction to Peptides and Fat Loss
02:07 The Role of Visceral Fat in Men Over 40
03:50 How Peptides Signal Cells and Regulate Functions
06:56 Top Peptides for Fat Loss and Metabolic Health
14:59 Understanding How Peptides Affect Appetite and Hormones
22:01 The Power of Dual and Triple Receptor Agonists
29:52 Safety, Side Effects, and Long-Term Considerations
45:06 Stacking Peptides and Personal Research Insights
01:00:03 Practical Use and Future of Peptides in Anti-Aging
My goal with Peptide Class is simply to help you understand the science, separate the evidence from the hype, and give you better questions to discuss with your healthcare provider.
Before talking about peptides, you need to understand that all body fat isn’t the same.
Subcutaneous fat is the fat sitting underneath your skin.
Visceral adipose tissue is the deeper fat surrounding your abdominal organs.
For men over 40, visceral fat is particularly important because excessive visceral adiposity is strongly associated with insulin resistance, type 2 diabetes, cardiovascular disease and other metabolic problems.
So when I talk about getting rid of belly fat, I’m not just talking about looking better without your shirt on.
I’m talking about improving your metabolic health.
Now let’s look at the compounds being discussed for accomplishing that.
A man can lose 30 pounds and lose both fat and muscle.
That’s particularly important with tirzepatide. The SURMOUNT 1 substudy found roughly 75% of weight lost was fat and 25% lean mass.
We aren’t trying to create smaller men.
We’re trying to create leaner, stronger, metabolically healthier men.
So if a man over 40 is using an appropriate medically supervised weight loss therapy, the foundation still needs to include resistance training, sufficient protein, appropriate calories, sleep, recovery and tracking body composition and strength, not merely watching the scale.
Peptides work by acting as biological signaling molecules that communicate with specific cells throughout your body.
When a peptide binds to its matching receptor on a cell, it triggers a chain of events that tells that cell to perform a specific job, such as repairing tissue, releasing hormones, regulating appetite, improving metabolism, or supporting recovery.
Think of peptides as text messages sent throughout your body. They don’t do the work themselves—they simply deliver the instructions that tell your cells what to do.
Your body is constantly communicating.
Every second of every day, billions of cells send and receive information that keeps you alive and functioning.
This communication system is made up of hormones, neurotransmitters, growth factors, cytokines, and peptides.
Each messenger has a specific role, but peptides are unique because they deliver highly targeted instructions to specific cells.
Without these signals, your body couldn’t coordinate the countless biological processes that keep you healthy.
Peptides are short chains of amino acids that act as signaling molecules throughout your body.
Instead of providing energy or building tissue like dietary protein, peptides act more like communication tools. They carry messages from one part of your body to another, telling cells when to grow, repair, release hormones, regulate inflammation, or perform countless other biological functions.
Every peptide has a specific message, and every message has a specific destination.
Imagine you send a text message to your contractor saying:
“Start building the deck tomorrow.”
The contractor already knows how to build the deck. He already has the tools, the materials, and the experience. He simply needed the instruction to begin.
Peptides work in much the same way.
Your cells already know how to repair damaged tissue, release growth hormone, regulate appetite, or produce collagen. The peptide simply delivers the message telling them it’s time to perform that specific task.
The peptide doesn’t perform the work itself. It tells the cell what work to do.
Every peptide begins with a signal.
Some peptides are naturally produced in your brain.
Others are produced in your digestive tract, muscles, immune cells, skin, or endocrine glands.
Once released, the peptide travels through your bloodstream or local tissues until it reaches its intended destination.
This journey is incredibly precise because each peptide is designed to communicate with only certain types of cells.
One of the most remarkable features of peptides is their specificity.
Every cell contains receptors on its surface that act like tiny locks.
Each peptide acts like a key.
Only the right peptide can activate the correct receptor.
If the peptide doesn’t fit, nothing happens.
This lock-and-key relationship allows your body to regulate extremely complex biological processes with incredible precision.
Once the peptide binds to its receptor, the real work begins.
The receptor changes shape and activates a signaling pathway inside the cell.
This signaling cascade may involve proteins, enzymes, messenger molecules, or genes that ultimately tell the cell exactly what to do next.
Depending on the peptide, that message might be:
One small signal can produce a very specific biological response.
Many medications affect multiple systems throughout the body at the same time.
Peptides are different.
Because they bind to specific receptors, many peptides are designed to influence targeted biological pathways rather than creating widespread effects throughout the body. This receptor specificity is one reason peptide therapeutics have become such an active area of medical research.
That doesn’t mean peptides are risk-free. Like any therapy or medication, their benefits and risks depend on the specific peptide, the dose, the individual, and the clinical context.
As you get older, your body doesn’t suddenly forget how to repair itself.
Instead, many of the signals become less efficient.
You may notice that you:
These changes are influenced by many factors, including age, hormones, physical activity, nutrition, sleep, and overall health. Researchers are studying whether certain peptide-based therapies may help support specific biological pathways involved in healthy aging, but they are not substitutes for lifestyle habits.
One of the biggest misconceptions is that peptides “make” something happen.
That’s not how most peptides work.
They don’t force your body to grow muscle.
They don’t force fat loss.
They don’t magically heal injuries.
Instead, they encourage specific cells and tissues to respond through their normal biological signaling mechanisms.
A better way to think about peptides is this:
They remind your body how to perform functions it already knows how to do.
Every peptide has a different job.
Some primarily influence metabolism and appetite.
Others affect growth hormone signaling.
Some are being studied for tissue repair.
Others may influence skin health, mitochondrial function, or immune regulation.
This is why there is no such thing as a “best peptide.”
The best choice—if appropriate under medical guidance—depends entirely on the biological process being targeted.
Peptides work because your body already understands their language.
They are biological messengers that bind to specific receptors on your cells, triggering highly targeted signaling pathways that regulate repair, metabolism, hormone release, recovery, appetite, and many other essential functions.
For men over 40, this is an exciting area of science because researchers continue to investigate how peptide-based therapies may support healthy aging and metabolic health. However, peptides should always be viewed as tools—not shortcuts.
The foundation of long-term health remains unchanged: resistance training, proper nutrition, quality sleep, stress management, mobility, and consistent healthy habits. Peptides, when medically appropriate, are designed to complement that foundation—not replace it.
If there is one peptide that has changed the conversation around weight loss over the last several years, it’s Semaglutide.
Semaglutide is a GLP-1 receptor agonist, meaning it mimics a naturally occurring hormone in your body called glucagon-like peptide-1.
This hormone is released after you eat and plays an important role in regulating appetite, blood sugar, insulin secretion, and how quickly food leaves your stomach.
Prescription forms of semaglutide are approved for specific medical uses, including type 2 diabetes and chronic weight management in appropriate patients. Many people recognize it by the brand names Ozempic® and Wegovy®.
For many men over 40 who struggle with obesity or excess body fat, semaglutide has become one of the most talked-about advances in metabolic medicine.
Semaglutide works by activating GLP-1 receptors throughout the body, particularly in the brain and digestive system.
One of its biggest effects is reducing appetite. Many people report significantly less “food noise,” fewer cravings, and feeling satisfied with smaller portions.
It also slows gastric emptying, meaning food stays in your stomach longer. This helps you feel fuller after meals while improving post-meal blood sugar control.
The result is often a sustained reduction in calorie intake, which contributes to weight loss when combined with healthy nutrition and lifestyle habits.
One reason semaglutide has become so popular is that its benefits extend beyond the scale.
For appropriate patients under medical supervision, semaglutide may support significant weight loss, improved blood sugar control, reduced appetite, better insulin sensitivity, and improvements in several cardiometabolic risk factors.
For many men over 40, those improvements can translate into increased energy, reduced visceral fat, and an easier time maintaining healthy eating habits.
Semaglutide is commonly prescribed for adults with type 2 diabetes or for chronic weight management in adults who meet specific medical criteria.
Many clinicians also discuss its potential role in improving metabolic syndrome, insulin resistance, and obesity-related health conditions as part of a comprehensive treatment plan.
Semaglutide is not intended for someone who simply wants to lose a few pounds before vacation.
Instead, it’s generally considered for adults living with obesity or overweight accompanied by weight-related medical conditions, after evaluation by a qualified healthcare provider.
For men over 40 who have struggled with traditional dieting, insulin resistance, or significant excess body fat, it may be one option to discuss with their physician.
Semaglutide has changed the way many healthcare professionals approach obesity and metabolic disease. For men over 40 struggling with significant excess weight, it may be an effective medical option when prescribed appropriately. However, it is not a shortcut. Long-term success still depends on nutrition, strength training, sleep, stress management, and sustainable lifestyle habits.
If Semaglutide changed the conversation around medical weight loss, Tirzepatide took it to another level.
Tirzepatide is the first medication in its class to activate both the GLP-1 and GIP receptors.
Instead of mimicking just one naturally occurring hormone involved in appetite and blood sugar regulation, it works through two complementary pathways.
This dual-action approach has generated tremendous interest because clinical studies have demonstrated significant improvements in weight loss, blood sugar control, and several metabolic health markers in appropriate patients.
Prescription forms of Tirzepatide are approved for specific medical uses, including type 2 diabetes and chronic weight management in eligible patients. Many people know it by the brand names Mounjaro® and Zepbound®.
For men over 40 who have struggled with obesity, insulin resistance, or metabolic syndrome, Tirzepatide has become one of the most promising peptide-based medications currently available.
Tirzepatide works by activating two important hormone receptors.
The first is the GLP-1 receptor, which helps reduce appetite, slows stomach emptying, improves insulin secretion when blood sugar rises, and helps you feel full after eating.
The second is the GIP receptor, another naturally occurring hormone involved in glucose regulation and metabolism. Researchers believe the addition of GIP receptor activation may contribute to improved insulin sensitivity and enhanced weight-loss effects compared with GLP-1 therapy alone.
Together, these pathways help regulate hunger, reduce calorie intake, improve blood sugar control, and support meaningful weight loss when combined with healthy lifestyle habits.
For many men over 40, Tirzepatide offers several potential benefits beyond simply losing weight.
Clinical studies have demonstrated significant reductions in body weight, improvements in blood sugar control, better insulin sensitivity, reductions in visceral fat, and favorable effects on several cardiometabolic risk factors in appropriate patients.
Many men also report feeling more in control of their eating habits because cravings and constant thoughts about food become much less intense.
Tirzepatide is commonly prescribed for adults with type 2 diabetes or chronic weight management when they meet the appropriate medical criteria.
Healthcare providers may also consider it as part of a broader strategy to improve metabolic health in individuals with obesity, insulin resistance, or other weight-related conditions.
Tirzepatide is generally intended for adults living with obesity or overweight accompanied by weight-related medical conditions who have not achieved sufficient results through lifestyle modification alone.
For many men over 40 dealing with stubborn body fat, elevated blood sugar, or metabolic syndrome, it may be an appropriate option to discuss with their healthcare provider.
Like Semaglutide, the most common side effects are gastrointestinal.
These may include nausea, constipation, diarrhea, bloating, reduced appetite, vomiting, fatigue, and occasional indigestion, particularly during the dose-escalation phase.
Most side effects improve as the body adapts, but every individual responds differently.
Tirzepatide is generally not appropriate for individuals with a personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2 (MEN2). It should also be used cautiously in people with a history of pancreatitis or certain gastrointestinal disorders and is generally avoided during pregnancy unless specifically recommended by a healthcare provider.
Is Tirzepatide stronger than Semaglutide?
Clinical studies have shown greater average weight loss with Tirzepatide in certain populations, but that does not automatically make it the better option for everyone.
Does Tirzepatide build muscle?
No.
Like Semaglutide, preserving muscle requires resistance training and adequate protein intake during weight loss.
Can I switch from Semaglutide to Tirzepatide?
Many patients do under medical supervision, but the decision should always be made with your healthcare provider.
Bottom Line
Tirzepatide represents one of the most exciting advances in obesity and metabolic medicine. For many men over 40, it may provide another effective option for improving body composition and metabolic health under appropriate medical supervision. Like every peptide discussed in this guide, it should be viewed as a tool that complements healthy lifestyle habits—not a replacement for them
Retatrutide has quickly become one of the most talked-about investigational peptides in the world.
Unlike Semaglutide and Tirzepatide, Retatrutide activates three different metabolic receptors instead of one or two.
It targets the GLP-1 receptor, the GIP receptor, and the glucagon receptor, making it the first triple-receptor agonist currently being studied for obesity and metabolic disease.
Although Retatrutide has shown very promising results in early clinical trials, it remains an investigational medication and has not been approved as an established treatment.
Retatrutide combines the appetite-regulating effects of GLP-1…
The insulin-supporting effects of GIP…
And the metabolic effects of glucagon receptor activation.
Glucagon receptor activation adds a different metabolic effect to retatrutide: rather than primarily reducing appetite, glucagon signaling can increase energy expenditure and promote hepatic lipid oxidation, helping the body mobilize and use stored energy.
When combined with GLP 1 and GIP signaling, the idea is to attack obesity from both sides of the energy balance equation by reducing calorie intake while potentially increasing energy expenditure and improving fat metabolism, although exactly how much glucagon contributes to these effects in humans is still being investigated.
Researchers believe this three-pronged approach may help reduce hunger, improve glucose regulation, increase energy expenditure, and support substantial reductions in body fat.
Because it targets multiple pathways simultaneously, Retatrutide has generated significant interest within obesity research.
Although still investigational, clinical studies have demonstrated impressive reductions in body weight, improvements in insulin sensitivity, reductions in visceral fat, and favorable changes in several cardiometabolic markers.
Researchers continue to evaluate its long-term safety and effectiveness.
Retatrutide is currently being investigated for obesity, metabolic syndrome, insulin resistance, fatty liver disease, and other cardiometabolic conditions.
At this time, it remains an investigational therapy rather than an approved treatment.
Because Retatrutide is still under investigation, it is not currently considered a routine treatment option.
As additional research becomes available and regulatory decisions are made, its role may become clearer.
Early studies suggest gastrointestinal side effects similar to other incretin-based therapies.
These may include nausea, vomiting, diarrhea, constipation, bloating, decreased appetite, and fatigue.
Researchers continue monitoring long-term safety.
Individuals with contraindications similar to GLP-1 receptor agonists—including certain thyroid cancer syndromes, pregnancy, or a history of pancreatitis—should discuss potential risks with a qualified healthcare professional.
Because Retatrutide remains investigational, careful medical oversight is essential in research settings.
Retatrutide may represent the next generation of metabolic peptide therapy, but it is still being studied. The early research is exciting, but until more data become available and regulatory decisions are made, it should be viewed as a promising investigational therapy—not an established treatment.
As men get older, one of the biggest frustrations isn’t necessarily the number on the scale—it’s where the fat is stored.
Even men who eat well and train consistently often notice an increase in stubborn abdominal fat, particularly deep inside the abdomen around the organs.
This type of fat, known as visceral fat, is associated with an increased risk of cardiovascular disease, insulin resistance, type 2 diabetes, and other metabolic conditions.
Tesamorelin is a synthetic Growth Hormone-Releasing Hormone (GHRH) analogue that stimulates your pituitary gland to release more of your body’s natural growth hormone.
Unlike taking growth hormone directly, Tesamorelin works by supporting your body’s own hormonal signaling.
It is important to understand that Tesamorelin has an FDA-approved medical indication for reducing excess visceral abdominal fat in adults with HIV-associated lipodystrophy.
While it is often discussed within the longevity and body composition communities, that approved indication should not automatically be generalized to men simply looking to lose belly fat.
Tesamorelin mimics your body’s natural Growth Hormone-Releasing Hormone.
When it binds to receptors in the pituitary gland, it stimulates the release of growth hormone, which then increases production of Insulin-like Growth Factor-1 (IGF-1).
Growth hormone and IGF-1 play important roles in fat metabolism, muscle maintenance, tissue repair, and overall body composition.
Researchers continue studying how these pathways may influence visceral fat reduction and metabolic health in different populations.
Men over 40 are commonly interested in Tesamorelin because it has been studied for its effects on visceral fat, body composition, growth hormone signaling, recovery, and metabolic health.
Some men also report improvements in energy, recovery, and overall body composition when it is used appropriately alongside resistance training and proper nutrition.
Tesamorelin is most commonly discussed by individuals looking to improve body composition, reduce visceral abdominal fat, support healthy growth hormone signaling, and complement a structured nutrition and exercise program.
Tesamorelin is generally considered by individuals who have already established healthy lifestyle habits but continue to struggle with excess visceral fat or metabolic health concerns.
It should always be evaluated by a qualified healthcare provider to determine whether it is appropriate for an individual’s medical history and goals.
Potential side effects may include injection-site reactions, joint discomfort, muscle aches, swelling due to fluid retention, headaches, tingling sensations, or elevated blood sugar in some individuals.
As with any therapy that influences hormone signaling, individual responses vary.
Tesamorelin should not be used by individuals with active cancer, pregnancy, breastfeeding, hypersensitivity to the medication, or certain endocrine disorders unless specifically advised by a qualified physician.
Is Tesamorelin the same as HGH?
No.
Tesamorelin stimulates your body’s natural release of growth hormone rather than supplying growth hormone directly.
Can Tesamorelin target belly fat?
Its approved medical use relates specifically to reducing excess visceral fat in adults with HIV-associated lipodystrophy. Its role in other populations continues to be studied.
Bottom Line
Tesamorelin is one of the most interesting peptides for men over 40 because it targets one of the biggest challenges of aging—visceral fat and declining growth hormone signaling. While its approved indication is specific, ongoing research continues to explore its broader role in metabolic health and body composition.
While most peptides focus on appetite, recovery, or growth hormone signaling, MOTS-c is different.
MOTS-c is a naturally occurring mitochondrial-derived peptide, meaning it originates from your mitochondria—the tiny energy-producing structures inside nearly every cell in your body.
Because mitochondrial function naturally declines with age, researchers have become increasingly interested in MOTS-c as a possible way to support metabolic health, insulin sensitivity, exercise performance, and healthy aging.
Although research remains in its early stages, MOTS-c is one of the most exciting investigational peptides in longevity science.
Your mitochondria are often called the power plants of your cells.
Their job is to convert nutrients into usable energy.
MOTS-c appears to help regulate how your cells use glucose and fat for fuel while influencing metabolic flexibility and insulin sensitivity.
Some researchers have even described MOTS-c as an “exercise mimetic” because early studies suggest it may activate some of the same metabolic pathways stimulated by physical activity.
That does not mean it replaces exercise.
Nothing replaces exercise.
Instead, researchers are investigating whether it may complement healthy lifestyle habits.
MOTS-c is commonly studied for metabolic flexibility, insulin sensitivity, mitochondrial health, cellular energy production, healthy aging, exercise adaptation, and overall metabolic function.
Men over 40 interested in longevity, metabolic optimization, and maintaining energy as they age are often drawn to MOTS-c.
MOTS-c is generally discussed by individuals who already prioritize nutrition, exercise, and healthy living and want to explore emerging science related to healthy aging.
Because MOTS-c remains investigational, comprehensive human safety data are limited.
Reported side effects appear relatively mild but additional research is needed.
Individuals with pregnancy, active cancer, significant chronic illness, or other medical conditions should consult a qualified healthcare professional before considering investigational peptides.
Does MOTS-c replace exercise?
Absolutely not.
Exercise remains the single most effective intervention for improving metabolic health.
Is MOTS-c approved?
No.
It remains an investigational peptide undergoing active research.
Bottom Line
MOTS-c represents one of the most fascinating developments in longevity research. Although much remains to be learned, its potential role in supporting mitochondrial function and metabolic health makes it one of the peptides worth watching over the coming years.
Whether you use a peptide, GLP 1 medication or nothing at all, my foundation stays the same.
Give your body a reason to keep its muscle.
Your protein requirements don’t disappear because your appetite does.
In fact, protein becomes even more important during a calorie deficit.
We want sustainable fat loss.
Not starvation.
Walk.
Move.
Stay active.
Poor sleep affects hunger, recovery, insulin sensitivity and training performance.
Chronic stress can undermine the entire process.
Track your waist.
Strength.
Body composition when available.
Blood pressure.
Blood glucose and other appropriate metabolic markers with your healthcare provider.
And how you actually feel and perform.
Brother, peptides are changing the conversation around obesity, fat loss and metabolic health.
Some of these compounds are already changing medicine.
Others may become important therapies in the future.
And some may never live up to their hype.
That’s okay.
Our job isn’t to become peptide fanboys.
Our job is to become educated men who understand the difference between evidence and marketing.
Tirzepatide and semaglutide have strong human evidence.
Retatrutide may represent the next generation.
Tesamorelin teaches us about visceral fat and GH signaling.
MOTS c introduces us to mitochondrial medicine.
But none of them change the foundation.
And when medications or peptide therapies are appropriate, make those decisions with a qualified healthcare professional who understands your health history.
Because after 40…
The goal isn’t simply to weigh less.
The goal is to become:
And stay that way for the rest of your life.
Transparency is important to me.
I am proud to be an official affiliate partner of Cellugenix Peptides.
If you choose to purchase through one of the links or discount codes found on this website, I may earn a commission at no additional cost to you. Your support helps fund the educational content I create for men over 40, including articles, videos, podcasts, and research reviews.
I only recommend companies that I believe demonstrate a commitment to quality, transparency, and third-party testing. My partnership with Cellugenix does not influence my opinions, research, or educational content. If the science doesn’t support something, I’ll say so.
Thank you for supporting Over 40 Alpha and allowing me to continue producing free educational content for men over 40.
After researching a number of peptide suppliers, I chose to partner with Cellugenix because I was looking for a company that emphasizes transparency, product testing, and educational resources.
At this point in my research, Cellugenix is one of the companies I feel comfortable recommending to my community based on the information I’ve reviewed and my experience so far.
That doesn’t make my recommendation permanent.
As new research emerges, manufacturing standards evolve, or if I find a company that better aligns with my standards, I’ll share that openly.
My commitment is to you, not to any single company.
Cellugenix Peptides supplies research-use-only (RUO) compounds intended for qualified laboratory research. According to Cellugenix’s published legal notice, these products are not intended for human or animal use, are not approved by Health Canada for therapeutic or clinical use, and should not be interpreted as drugs, foods, cosmetics, or treatments. Information about biological mechanisms or study findings is provided for educational purposes only and is not medical advice.
When I discuss peptides on this website, I am discussing the available scientific literature, published research, and the broader field of peptide science. References to research compounds should never be interpreted as recommendations for personal use or as evidence of safety or effectiveness in humans outside their approved indications.
