Peptide Glossary — 109+ Terms

A pre-mixed vial containing two peptides (like Tesamorelin and Ipamorelin) designed to work together for better results, such as fat loss and muscle building. Blends make dosing easier by combining effects.

Similar to a 2X blend but with three peptides (e.g., Tesamoralin, Ipamorelin, and MGF), often for advanced goals like athletic recovery, anti-aging, and adding lean muscle.

A blend of four peptides (e.g., Tesamoralin, Ipamorelin, GHRP-2, and MGF) aimed at bulking, increasing muscle mass, and boosting appetite.

The basic building blocks that link together to form peptides and proteins. There are 20 common ones in the body, each with a unique side chain that gives it special properties.

The body's master metabolic switch, activated by low energy states (like exercise or fasting). AMPK triggers glucose uptake, fat burning, and mitochondrial biogenesis. Several mitochondrial peptides like MOTS-c activate AMPK to mimic the metabolic effects of exercise at the cellular level.

The formation of new blood vessels from existing ones. Critical to tissue healing because new vessels deliver oxygen and nutrients to damaged tissue. Several healing peptides including BPC-157 and TB-500 promote angiogenesis as a central mechanism of action.

A property that helps break down or prevent sticky layers (biofilms) formed by bacteria, making infections harder to treat.

Something that kills or stops the growth of microbes like bacteria, viruses, or fungi, acting like a natural antibiotic.

A synthetic peptide derived from human growth hormone that helps break down fat (lipolysis) without affecting hunger or blood sugar levels. Often used for weight management and stacked with other peptides.

Short for Bacteriostatic Water, a sterile water mixed with a small amount of benzyl alcohol to prevent bacterial growth. It's used to dissolve (reconstitute) peptide powders for safe injection.

Brain-Derived Neurotrophic Factor - A protein that supports the growth and survival of brain cells (neurogenesis), helping with memory, learning, mood, and cognitive function. Used in peptides for brain health and repair.

The proportion of a substance that enters circulation when introduced into the body and is able to have an active effect at the target site.

A class of short peptides (typically 2-4 amino acids) developed primarily by Russian researchers, notably Professor Vladimir Khavinsky, that are designed to restore and normalize the function of specific organs and tissues. Bioregulators include Epithalon (pineal gland and telomeres), Pinealon (brain cortex), Thymalin (thymus and immune), and Cortagen (brain). They work by penetrating cell nuclei and directly influencing gene expression.

A synthetic peptide known for its healing properties; it protects and repairs tissues like muscles, gut, heart, and nerves. Popular for injury recovery, reducing inflammation, and overall protection (neuroprotective, gastroprotective, etc.).

A peptide that controls appetite, supports weight loss, and improves metabolism. Often added to GLP-1 peptides to enhance effects and reduce doses.

A phospholipid found exclusively in the inner mitochondrial membrane that holds the electron transport chain machinery in place. Cardiolipin degrades with age and oxidative stress, reducing energy production efficiency. SS-31 works by binding and stabilizing cardiolipin.

Describes something that protects the heart from damage, like reducing inflammation or improving blood flow.

Your body's internal 24-hour rhythm that controls sleep, hormones, and other functions; disrupting it can affect health.

A growth hormone-releasing hormone (GHRH) peptide that boosts your body's natural growth hormone and IGF-1 levels for muscle growth, fat loss, and anti-aging. 'No DAC' means it's short-acting without a prolonging modification.

Similar to the no-DAC version but with a Drug Affinity Complex (DAC) that makes it last longer in the body, allowing less frequent dosing.

A natural compound from turmeric used here as an injectable for reducing inflammation, acting as an antioxidant, and supporting tissue repair and gut health.

The active metabolite of Noopept (omberacetam) after oral administration. An endogenous dipeptide found naturally in the brain that acts as a positive modulator of AMPA receptors and activates the BDNF/TrkB signaling pathway, driving Noopept's nootropic and neuroprotective effects.

Drug Affinity Complex - A chemical modification added to some peptides (like CJC-1295) to make them stay active in the body longer, reducing how often you need to inject.

Delta Sleep-Inducing Peptide - A peptide that helps reset your sleep cycle, supports the nervous and hormonal systems, and aids in detox or withdrawal from substances like alcohol or opioids.

Something produced naturally inside your body, like endogenous growth hormone (made by your pituitary gland) versus exogenous (injected from outside).

A synthetic peptide that works on the pineal gland to lengthen telomeres (DNA caps), restore melatonin levels, and promote anti-aging effects.

Extracellular signal-regulated kinase 1/2 — a cellular signaling pathway that drives cell proliferation, migration, and survival. BPC-157 activates ERK1/2 in endothelial cells to promote wound healing and vascular tube formation.

A state where you haven't eaten for a while (e.g., 45 minutes before/after injection), often recommended to maximize peptide absorption or effects.

A peptide that blocks myostatin (a protein that limits muscle growth), helping increase muscle mass, strength, and treat muscle wasting; also reduces cortisol.

The process by which a molecule binds to monomeric (free) actin, keeping it available for rapid cytoskeletal assembly when cells need to move or change shape. TB-500's primary mechanism — it sequesters G-actin to enable faster cellular migration into injury sites.

Protects the stomach and digestive system from damage or inflammation.

A compound classified by Russian gerontology researchers as capable of slowing biological aging of a specific organ or system. Distinguished from general anti-aging supplements by its targeted, organ-specific mechanism. Examples include Epithalon (pineal gland and telomeres), Pinealon (brain cortex), and Thymalin (thymus and immune aging).

A copper-bound peptide that tightens skin, reduces wrinkles, fights hair loss, aids wound healing, bone repair, and reduces inflammation.

A hormone made in the stomach that signals hunger to the brain; some peptides affect it to increase appetite.

A growth hormone-releasing peptide (second strongest) that boosts natural GH and ghrelin for muscle growth; increases appetite slightly.

Similar to GHRP-2 but third strongest, with stronger appetite stimulation for bulking.

An incretin hormone that, alongside GLP-1, regulates insulin release after meals. GIP receptors are found in the brain, fat cells, and pancreas. Dual GLP-1/GIP agonists produce synergistic weight loss because the pathways converge on overlapping cellular machinery.

A mix of GHK-Cu, BPC-157, and TB-500 for enhancing skin health, accelerating healing, and supporting tissue regeneration.

Glucagon-Like Peptide-1 - A hormone mimic that enhances insulin, lowers blood sugar, suppresses appetite, and promotes weight loss (up to 15%); may cause nausea.

Targets two receptors (GLP-1 and GIP) for better weight loss (up to 20%), slower digestion, and less nausea; similar to drugs like Tirzepatide.

A triple agonist adding glucagon receptor action for even more weight loss (up to 25%), easier on the stomach, with added energy and mental clarity.

A peptide that stimulates the release of hormones (LH and FSH) to boost testosterone production and treat low hormone levels (hypogonadism).

The time required for the concentration of a substance to decrease to half of its initial value, important for determining dosing frequency in research.

Human Chorionic Gonadotropin - A hormone used to stimulate testosterone and sperm in men or ovulation in women; treats hypogonadism and supports fertility.

The most potent growth hormone-releasing peptide that boosts GH without increasing appetite; promotes muscle growth.

Human Growth Hormone - The actual growth hormone injected directly (exogenous) to build muscle, increase bone density, and promote fat breakdown.

A transcription factor activated under low-oxygen or cellular stress conditions that regulates up to 100 genes involved in neuroprotection, angiogenesis, glucose transport, and mitochondrial function. Activated by Noopept (omberacetam) as part of its neuroprotective mechanism.

A 21-amino acid mitochondrial-derived peptide discovered in 2001 in surviving brain cells of an Alzheimer's patient. Works primarily by blocking pro-apoptotic proteins (particularly Bax), protecting cells from stress-induced programmed death. Forms the third component of the mitochondrial peptide trio alongside MOTS-c and SS-31.

A condition where the body doesn't produce enough sex hormones like testosterone, leading to low energy, fertility issues, etc.

Insulin-Like Growth Factor-1 - A hormone stimulated by GH that helps build muscle, burn fat, and repair tissues.

A short-acting variant of IGF-1 for similar muscle and fat effects.

A long-acting form of IGF-1 that binds to receptors to build muscle, boost metabolism, and aid recovery.

Small proteins released during inflammation that can cause pain or damage if overproduced; some peptides reduce them.

An injection method where the needle goes into a muscle for faster absorption.

A growth hormone-releasing peptide that boosts GH without increasing appetite, cortisol, or prolactin; great for muscle growth.

A peptide that helps balance hormones, support reproductive health, and overall wellness.

An anti-inflammatory and antimicrobial peptide that reduces cytokines, promotes wound healing, and helps with gut issues like inflammatory bowel disease.

The process of breaking down fats in the body to release energy.

An antimicrobial peptide that fights bacteria, viruses, and biofilms; used as a natural antibiotic for lung or gut infections.

Freeze-drying process used to preserve peptides by removing water content, extending shelf life and maintaining stability.

An alternative splice variant of the IGF-1 gene produced locally in skeletal muscle in response to mechanical overload and injury. Acts as a local first-responder to activate muscle satellite cells for repair. Has a very short half-life of 5-7 minutes in its native form — see PEG-MGF for a longer-acting version.

The body's production of melanin, the pigment that darkens skin (tanning).

A peptide for inducing tanning and suppressing appetite, with added sexual stimulus.

Similar to MT-I, promotes tanning, appetite suppression, and enhanced libido.

Mechano Growth Factor - A peptide that promotes muscle regeneration and repair after exercise or injury by activating stem cells.

The process by which cells make new mitochondria in response to energy demand or stress. Activated by AMPK and PGC-1α signaling. MOTS-c promotes mitochondrial biogenesis as a core anti-aging and metabolic adaptation mechanism.

The process by which cell 'powerhouses' (mitochondria) produce energy (ATP) from nutrients.

A class of small peptides encoded within mitochondrial DNA rather than nuclear DNA. MDPs represent a newly recognized signaling system through which mitochondria communicate their metabolic state to the rest of the cell and body. Known members include MOTS-c, Humanin, and the SHLP family. Levels of most MDPs decline with age and metabolic disease.

A mitochondrial peptide called 'exercise in a bottle' that turns glucose into energy, aids anti-aging, and helps with diabetes or insulin resistance.

Protects muscles, bones, and joints from damage or inflammation.

A protein that naturally limits muscle growth; inhibiting it allows for more muscle development.

Nicotinamide Adenine Dinucleotide - A molecule essential for cell energy, DNA repair, and mitochondrial function; used for anti-aging and restoring damage.

The growth and development of new brain cells or neurons.

Peptides that function as neurotransmitters or neuromodulators in the nervous system, influencing neural signaling and brain function.

The brain's ability to reorganize and form new connections, helping with learning and adaptation.

Protects brain cells from damage or degeneration.

Known as the 'love hormone,' it boosts social bonding, emotional well-being, and reduces stress/anxiety.

A peptide for neuroprotection, cognitive support, and mood enhancement.

The chemical process of attaching polyethylene glycol (PEG) molecules to a peptide or protein, which extends its half-life by protecting it from enzymatic breakdown and improves bioavailability. Used to create PEG-MGF from native MGF, extending its half-life from minutes to hours or days.

A short chain of 2-50 amino acids linked together; smaller than proteins but can act like hormones or signals in the body for various effects.

The chemical link between amino acids in a peptide or protein, formed by removing water.

A large molecule made of 50+ amino acids; peptides are shorter versions that can turn into or mimic parts of proteins.

A peptide that signals the brain to increase blood flow, arousal, and libido in men and women.

The process of mixing lyophilized (freeze-dried) peptide powder with bacteriostatic water or sterile solution to create an injectable form.

Muscle stem cells that reside between the muscle fiber membrane and its surrounding sheath. In a quiescent resting state under normal conditions, they activate rapidly after mechanical stress or injury. When activated by signals like MGF, they proliferate and differentiate into new muscle fibers, driving repair and hypertrophy.

An anti-anxiety peptide that boosts serotonin and dopamine for better mood, learning, and memory.

A peptide that triggers brain-derived neurotrophic factor for improved neuroplasticity, learning, and blood flow to the brain.

A growth hormone-releasing hormone that boosts natural GH for muscle strength, repair, anti-aging, and bone density.

A family of proteins that regulate cellular aging, DNA repair, inflammation, and metabolic efficiency. Sirtuins require NAD+ as their substrate. When NAD+ levels decline with age, sirtuin activity drops — one reason direct NAD+ supplementation is linked to longevity research.

An oral peptide (tablets) for muscle or metabolic support, though details are limited in the guide.

A peptide that targets mitochondria to protect and restore energy production, boosting ATP, brain power, and fighting cancer.

An injection under the skin into fatty tissue for slow, steady absorption.

A dual agonist peptide targeting GLP-1 and glucagon for appetite reduction, weight loss, and help with fatigue or fatty liver.

The formation of new synaptic connections between neurons. Critical for learning, memory formation, and recovery from brain injury. Stimulated by BDNF, Semax, and — according to early research now partially retracted — Dihexa via the HGF/c-Met pathway.

Delivery method where a substance enters the bloodstream to affect the entire body, as opposed to local or targeted delivery.

Thymosin Alpha-1 - A peptide that stimulates the immune system by activating T-cells and other cells to fight bacteria, viruses, fungi, and cancer.

A peptide that reduces inflammation and speeds wound healing in joints and muscles by binding to actin.

An enzyme that adds DNA sequences to the ends of chromosomes (telomeres), slowing or reversing telomere shortening that occurs with each cell division. Epithalon is studied for its ability to activate telomerase, which is why it is classified as a longevity peptide.

Protective caps at the ends of DNA strands; shortening them leads to aging, so lengthening promotes longevity.

A growth hormone-releasing hormone that boosts GH and IGF-1 to reduce visceral fat and support muscle.

An oral tablet that inhibits reuptake of serotonin, noradrenaline, and dopamine for mood enhancement, appetite suppression, energy, and cognition.

Something that increases body heat production to burn more calories and fat.

The progressive shrinkage of the thymus gland that begins in early adulthood and accelerates with age. Since the thymus is where T-cells mature, thymus involution directly causes the decline in adaptive immune function associated with aging. Thymalin is studied for its ability to slow or partially reverse this process.

A measurement on insulin syringes for precise peptide dosing; e.g., 10 units might equal 1.5mg depending on dilution.

A key receptor driving new blood vessel formation. BPC-157 activates VEGFR2 signaling, which is considered one of its primary mechanisms for promoting healing in poorly vascularized tissues like tendons and ligaments.

A small glass bottle holding the peptide powder or reconstituted solution for storage and drawing doses.

The two primary receptors for VIP (Vasoactive Intestinal Peptide) and PACAP, found in the CNS, liver, lung, intestine, and immune cells. VPAC1 binding mediates anti-inflammatory effects. VPAC2 binding is more prominent in the brain and circadian rhythm regulation. VIP's selectivity for these receptors rather than broad immune suppression is what distinguishes it from corticosteroids as an anti-inflammatory agent.

A fundamental cellular signaling pathway governing cell proliferation, differentiation, and tissue homeostasis. Activated by TB-500 in a 2024 study, offering a molecular explanation for how the peptide coordinates multiple tissue repair processes simultaneously.

A mix of BPC-157 and TB-500 for enhanced healing, skin health, and tissue regeneration, named for fast recovery like the comic character.