Peptides have exploded in popularity among biohackers and health optimization enthusiasts, with over 60 different options flooding the market.
But according to Dr. Ashley Frazee, most people don’t need more peptide information—they need a system to understand how these signaling molecules work.
In a recent video breaking down her extensive research, Dr. Frazee shared a framework for thinking about peptides that cuts through confusion and helps people make informed decisions about their biology.
She’s spent hundreds of hours studying the research and created nearly 30 videos on the topic, and her conclusion is clear: peptides aren’t drugs—they’re amplifiers of biology.
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Understanding Cellular Signaling
Before diving into specific peptides, Dr. Frazee emphasizes understanding one fundamental concept: your body runs on signals.
The brain sends signals, hormones carry them, and cells receive them. When everything works properly, recovery happens, muscles build, fat burns, sleep improves, and mental clarity shines through.
However, stress, inflammation, poor sleep, and aging degrade these signals. Cells stop receiving messages effectively. Mitochondria—the cellular engines producing energy—begin to sputter.
The pituitary gland, which coordinates growth hormone, reproductive function, and stress response, starts making poor decisions. This is where peptides enter the picture.
They’re not necessarily drugs. They’re signaling molecules, amplifiers of biology. They help restore the conversations your body is already trying to have.
Inflammation and Tissue Repair
Chronic inflammation sits at the root of nearly every health problem, according to Dr. Frazee. It damages receptors, blocks hormones from binding, and traps bodies in survival mode.
GHK Copper: The Gene Expression Modifier
GHK copper stands as one of the most researched anti-inflammatory peptides available. Naturally occurring in the body, production drops significantly with age.
Research demonstrates its ability to calm inflammatory gene expression and promote collagen synthesis. Perhaps most remarkably, studies show it influences over 4,000 genes related to tissue remodeling and repair.
This peptide essentially helps reset tissue environments back toward healthier, younger baselines.
KPV: Targeting Inflammation at the Source
KPV represents a fragment of alpha MSH, a hormone everyone produces naturally. This small peptide works by inhibiting inflammatory pathways at the cellular level.
It enters cell nuclei and deactivates NF-kappa B, the master switch for inflammation. Research has heavily studied its effects on gut inflammation in animals, though many users report benefits for skin inflammation as well.
Since gut inflammation affects everything downstream—nutrient absorption, immune signaling, even mood—addressing it creates widespread benefits.
Thymosin Alpha-1 and BPC-157
Thymosin alpha-1 functions as an immune modulator rather than a simple immune booster. Research shows it helps immune systems respond more intelligently rather than just more aggressively.
It’s approved as medication in over 35 countries for conditions including hepatitis.
BPC-157 might be the most well-known recovery peptide available. Standing for “body protection compound,” it derives from a protein found in stomach tissue.
What makes BPC-157 unique is that it appears to upregulate growth factor receptors. Meaning it doesn’t just act as a signal. It makes your tissues more sensitive to the repair signals that your body is already sending.
Extensive animal studies have examined its effects on tendon, ligament, muscle, and gut healing. TB-500, often paired with BPC-157 in the “Wolverine blend,” works differently by promoting cellular migration—essentially acting as GPS coordinates directing repair signals to injury sites.
Fighting Fatigue Through Mitochondrial Support
Mitochondrial dysfunction creates widespread fatigue that sleep cannot fix. When these cellular powerhouses produce insufficient ATP, brain fog, slow recovery, and persistent exhaustion follow.
SS-31 (Elamipretide)
SS-31, one of Dr. Frazee’s favorites, has earned FDA approval for a specific mitochondrial disease. Research demonstrates it protects and stabilizes inner mitochondrial membranes by binding to cardiolipin.
This structural integrity proves crucial for energy production. When oxidative stress or inflammation damages cardiolipin, energy production tanks.
MOTS-c: The Mitochondrial Messenger
MOTS-c differs from other peptides because mitochondrial DNA encodes it. As a mitochondrial-derived signaling peptide, it represents how mitochondria communicate with the rest of the body.
Animal studies show MOTS-c activates AMPK, the body’s master fuel sensor. It increases glucose utilization, lowers insulin resistance, and shifts cells toward burning fatty acids rather than storing them.
Recovery and Growth Hormone Optimization
The pituitary gland naturally releases growth hormone in pulses, especially during deep sleep and after exercise. Growth hormone drives repair, recovery, muscle protein synthesis, and fat metabolism.
As aging progresses, these pulses weaken and become less frequent.
Sermorelin and CJC-1295
Sermorelin, a growth hormone-releasing hormone analog, stimulates the pituitary to release growth hormone in natural pulsatile patterns. Unlike synthetic human growth hormone that floods the system, this approach maintains how bodies are designed to utilize growth hormone.
CJC-1295 works similarly but stays active longer, making it slightly more potent. It’s often combined with ipamorelin, a growth hormone-releasing peptide that mimics ghrelin—the hunger hormone released during fasting to increase growth hormone output.
Ipamorelin’s popularity stems from its selectivity: it raises growth hormone without significantly increasing cortisol and prolactin like other similar peptides.
Tesamorelin: The Visceral Fat Reducer
Tesamorelin has FDA approval specifically for reducing visceral fat in people with HIV-associated lipodystrophy. Studies demonstrated 15-20% reductions in visceral fat over 6-12 months.
It works by increasing growth hormone output, which improves fatty acid oxidation—the breakdown of stored fat for fuel.
Metabolism and Fat Loss Revolution
This category has exploded recently, with peptides fundamentally changing how bodies handle insulin, appetite, and metabolic signaling.
From Semaglutide to Retatrutide
Semaglutide, originally developed for type 2 diabetes and now indicated for obesity, mimics a hormone the gut releases after eating. It tells brains you’re full and helps pancreases manage insulin effectively.
Benefits extend beyond appetite suppression to include improvements in cardiovascular markers, inflammatory markers, and early research suggests neuroprotective effects.
Tirzepatide, a dual agonist hitting both GLP-1 and GIP receptors, showed 30% reductions in fatty liver with unprecedented weight loss results—until retatrutide arrived.
Retatrutide, a triple agonist targeting GLP-1, GIP, and glucagon receptors, demonstrated up to 80% reductions in fatty liver and direct visceral fat loss. It blunts appetite, improves fat burning, and maintains or increases metabolic rate even during caloric deficits.
Cognitive Enhancement and Stress Management
Brain function relies on the same signaling principles as the rest of the body. When neuroplasticity drops and neurotrophic factors decline, brain fog, poor focus, and slower learning result.
Selank and Semax
Selank, developed in Russia, demonstrates anxiolytic properties similar to benzodiazepines but without sedation or addictive potential. It modulates GABA activity and influences serotonin metabolism while helping regulate overactive cortisol responses.
Semax has been extensively studied for cognitive enhancement. Its primary action involves increasing brain-derived neurotrophic factor—essentially fertilizer for neurons that strengthens existing neural connections and builds new ones.
Dihexa: Powerful But Proceed With Caution
Dihexa represents one of the most potent cognitive peptides available. Research shows it may be up to 10 million times more powerful than brain-derived neurotrophic factor at promoting neural connections.
However, Dr. Frazee cautions that real safety concerns exist due to its mechanism involving the hepatocyte growth factor-c-Met pathway, which plays major roles in synapse formation.
Sleep Optimization and Longevity
Deep sleep enables the body’s most profound repair work. Disrupted circadian rhythms or broken sleep architecture compromise everything, since growth hormone pulses, brain waste clearance, and recovery all happen during deep sleep.
Epitalon and Pinealon
Epitalon has been studied for its effects on the pineal gland and melatonin production, helping reset circadian rhythms and restore natural melatonin cycles.
What makes epitalon particularly interesting is research showing it activates telomerase, the enzyme lengthening telomeres—protective caps on chromosomes that shorten with age.
Pinealon works at the gene expression level within pineal cells, helping restore cellular structure and normalize melatonin synthesis.
DSIP (delta sleep-inducing peptide) lives up to its name by promoting delta wave sleep—the deepest stage where significant physical recovery occurs.
The Bottom Line
Understanding peptides requires more than memorizing names and benefits. Success demands knowing which categories address specific biological needs and understanding both potential benefits and safety concerns.
The thing most people get wrong about peptides is not knowing the categories in which they can fit in. See, if you’re going to play around with peptides, you have to understand what these things could potentially do.
Dr. Frazee acknowledges that much knowledge comes from cellular and animal research rather than human trials. However, real-world human use has provided valuable insights.
Everyone has unique circumstances requiring personalized approaches. Rather than rushing to try every peptide available, focusing on understanding their mechanisms and applications creates better outcomes.
The goal isn’t just knowing about peptides—it’s understanding them well enough to make intelligent decisions about personal biology and have informed conversations with healthcare providers.
