Your go-to reference for peptide science, biohacking, and research terminology.
For educational and research purposes only. Not medical advice. Peptides discussed here are not FDA-approved for human use outside of clinical trials.
The fundamental molecular building blocks of peptides and proteins. There are 20 standard amino acids that combine in different sequences to form every peptide and protein in the human body. Understanding amino acids is essential to understanding how peptides are structured and why specific sequences produce specific biological effects.
Often called the "metabolic master switch," AMPK is an enzyme that helps regulate cellular energy balance. When activated (by fasting, exercise, or certain compounds), AMPK promotes energy production, fat oxidation, and autophagy. AMPK and mTOR have an inverse relationship — higher AMPK activation generally means lower mTOR activity, which is a foundational concept in longevity biohacking.
The physiological process through which new blood vessels form from existing vasculature. In peptide research, angiogenesis is a frequently studied endpoint because improved blood vessel formation may support nutrient delivery and tissue repair in preclinical models. Peptides like BPC-157 and TB-500 have been investigated for their roles in angiogenic signaling pathways, particularly through VEGF-related mechanisms.
A cellular "housekeeping" process in which the body breaks down and recycles damaged or dysfunctional cell components. Autophagy is a central concept in longevity research and biohacking, often activated through fasting, caloric restriction, or specific compounds. It plays a key role in cellular renewal and is closely tied to the AMPK and mTOR signaling pathways.
Sterile water containing 0.9% benzyl alcohol, used as a solvent for reconstituting lyophilized (freeze-dried) peptide powders before use in research settings. The benzyl alcohol acts as a preservative, inhibiting bacterial growth and extending the usable life of reconstituted solutions compared to plain sterile water.
The proportion of a substance that enters systemic circulation and is available to exert its biological effect. In peptide research, bioavailability varies significantly by route of administration — subcutaneous injection, oral delivery, nasal spray, or transdermal application each offer different absorption profiles. Understanding bioavailability helps researchers evaluate which delivery method may be most effective for a given peptide.
The practice of using science, technology, and self-experimentation to optimize biological performance, health, and longevity. In the peptide space, biohacking often refers to researching and experimenting with compounds like growth hormone secretagogues, nootropic peptides, or recovery peptides — alongside practices like cold exposure, fasting, and sleep optimization.
A synthetic pentadecapeptide (15-amino-acid chain) originally isolated from human gastric juice. BPC-157 is one of the most widely studied research peptides, with over 180 peer-reviewed preclinical studies investigating its effects on tissue repair, angiogenesis, anti-inflammatory signaling, and gut integrity. It is not FDA-approved for human use and is classified as a Category 2 bulk drug substance by the FDA.
A document issued by a third-party laboratory that verifies the purity, identity, and composition of a peptide product. A COA typically includes results from High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS) testing. When sourcing research peptides, reviewing the COA is critical for confirming product quality and purity (typically ≥98%).
A synthetic peptide analog of growth hormone-releasing hormone (GHRH) studied for its ability to stimulate sustained growth hormone (GH) secretion. CJC-1295 is available in two forms in research contexts: with DAC (Drug Affinity Complex), which extends its half-life, and without DAC, which produces shorter-duration GH pulses. It is often studied alongside ipamorelin.
The biological process by which the body produces collagen — the most abundant structural protein in connective tissues including skin, tendons, ligaments, and bones. Several research peptides, including BPC-157 and GHK-Cu, have been investigated in preclinical models for their potential influence on collagen synthesis, which is a key endpoint in tissue repair and anti-aging research.
In peptide research contexts, cycling refers to the practice of using a compound for a defined period (the "on" phase), followed by a break (the "off" phase), before resuming. Cycling protocols are discussed in research communities as a strategy to avoid receptor desensitization, maintain efficacy, and reduce potential side effects. Common discussed cycles range from 4–12 weeks on, followed by 2–8 weeks off.
Small signaling proteins released by cells that regulate inflammation, immune responses, and cellular communication. In peptide research, measuring cytokine levels (such as TNF-α, IL-6, or IL-10) is a common way to evaluate a peptide's anti-inflammatory or immunomodulatory potential. Peptides like BPC-157 and KPV have been studied for their effects on pro-inflammatory cytokine expression.
A biological process in which receptors become less responsive to a stimulus after prolonged or repeated exposure. In peptide research, desensitization is a key reason cycling protocols are discussed — extended use of growth hormone secretagogues, for instance, may result in diminished GH release over time. Researchers use "off" periods to allow receptor sensitivity to recover.
The measured amount of a compound administered in a research protocol. Peptides are typically measured in micrograms (mcg or μg) or milligrams (mg). One milligram equals 1,000 micrograms. Precise dosing is essential in peptide research because peptides operate at very low concentrations, and even small variations can influence outcomes in experimental models.
A synthetic tetrapeptide (Ala-Glu-Asp-Gly) studied for its potential effects on telomerase activity and telomere length. Developed from research by Dr. Vladimir Khavinson, Epitalon is one of the most discussed peptides in longevity and anti-aging research circles. Preclinical studies have explored its relationship with pineal gland function and melatonin production. Not FDA-approved for human use.
The structural network of proteins (including collagen, elastin, and fibronectin) that surrounds and supports cells within tissues. ECM remodeling is a critical endpoint in tissue repair research, and several peptides — including GHK-Cu and TB-500 — are studied for their influence on ECM organization, metalloproteinase activity, and structural integrity in preclinical models.
A type of cell found in connective tissue that produces collagen and the extracellular matrix — the structural scaffolding of tissues. Fibroblast activity is a key endpoint in peptide research focused on wound healing, tissue repair, and regeneration. BPC-157 has been studied for its influence on fibroblast proliferation and migration in preclinical models.
A naturally occurring tripeptide (Gly-His-Lys) complexed with copper(II) ions, found in human plasma, saliva, and urine. GHK-Cu has been studied in research models for its potential roles in collagen synthesis, wound healing, anti-inflammatory signaling, and antioxidant activity. It is also widely discussed in skin health and anti-aging contexts for its effects on extracellular matrix remodeling.
A class of compounds that stimulate the body's natural release of growth hormone (GH) from the pituitary gland. Unlike exogenous GH injections, secretagogues work by triggering the body's own production pathways. Research peptides in this category include ipamorelin, CJC-1295, MK-677 (a non-peptide secretagogue), and GHRP-6. They are commonly studied for their potential effects on muscle growth, fat metabolism, sleep quality, and recovery.
The time required for the concentration of a substance in the body to decrease by half. In peptide research, half-life determines dosing frequency and informs protocol design. For example, BPC-157 has a relatively short half-life (under 30 minutes in some models), while CJC-1295 with DAC has an extended half-life of several days. Understanding half-life is critical for evaluating how long a peptide remains biologically active.
An analytical technique used to separate, identify, and quantify components in a mixture. In the peptide industry, HPLC testing is the gold standard for verifying peptide purity. A reputable research peptide vendor should provide HPLC results (typically showing ≥98% or ≥99% purity) as part of their Certificate of Analysis.
A hormone with a molecular structure similar to insulin that plays a key role in growth and anabolic processes. IGF-1 is primarily produced in the liver in response to growth hormone stimulation, making it a downstream biomarker frequently measured in GH secretagogue research. Elevated IGF-1 levels are associated with muscle growth and tissue repair, while chronically elevated levels are a subject of debate in longevity research.
The body's biological response to harmful stimuli such as injury, infection, or irritants. While acute inflammation is a necessary healing process, chronic inflammation is associated with a wide range of health conditions. Many research peptides — including BPC-157, TB-500, KPV, and GHK-Cu — are studied for their potential anti-inflammatory mechanisms in preclinical models.
A synthetic pentapeptide growth hormone secretagogue that selectively stimulates GH release from the pituitary gland. Unlike other GH secretagogues such as GHRP-6, ipamorelin is studied for its selectivity — it does not significantly increase cortisol or prolactin levels in preclinical models. It is frequently discussed in combination with CJC-1295 (no DAC) for research into GH-related pathways.
A tripeptide (Lys-Pro-Val) derived from the C-terminal region of alpha-melanocyte-stimulating hormone (α-MSH). KPV is studied in research models for its potential anti-inflammatory and immunomodulatory effects, particularly its ability to modulate NF-κB signaling and reduce pro-inflammatory cytokine production. It has generated interest in gut health and inflammatory condition research.
In the context of biohacking and peptide research, longevity refers to the science of extending healthspan — the number of years lived in good health — rather than simply lifespan. Longevity-focused peptide research often involves compounds like Epitalon, GHK-Cu, and various growth hormone secretagogues, alongside lifestyle interventions such as fasting, cold exposure, and optimized sleep.
A preservation process that removes water from a peptide solution by freezing it and then reducing pressure to allow the frozen water to sublimate directly into vapor. The result is a stable, dry powder (often called a "lyophilized cake") that retains the peptide's structural integrity for long-term storage. Most research peptides are shipped in lyophilized form and require reconstitution before use.
An analytical technique that measures the mass-to-charge ratio of molecules to confirm their molecular identity. In peptide quality assurance, mass spectrometry is used alongside HPLC to verify that a synthesized peptide matches its intended molecular weight and amino acid sequence. Reputable vendors provide MS data on their Certificate of Analysis.
A non-peptide, orally active growth hormone secretagogue that mimics the action of ghrelin, stimulating GH release from the pituitary gland. While not technically a peptide, MK-677 is frequently discussed in peptide and biohacking communities. It has been studied for its effects on GH and IGF-1 levels, sleep quality, appetite, and body composition in clinical research settings.
A central cellular signaling pathway that regulates cell growth, protein synthesis, and metabolism. mTOR is a critical concept in both muscle-building and longevity research — its activation promotes growth and repair, while its inhibition (through fasting, rapamycin, or caloric restriction) is associated with autophagy and longevity. mTOR and AMPK exist in an inverse relationship.
The brain's ability to form new neural connections, reorganize existing pathways, and adapt throughout life. Neuroplasticity is a central concept in nootropic peptide research — peptides like Semax and Selank are studied for their potential to enhance BDNF expression and support neural adaptation. In biohacking contexts, promoting neuroplasticity is associated with improved learning, memory, and cognitive resilience.
A protein complex that plays a central role in regulating inflammatory and immune responses at the genetic level. When activated, NF-κB drives the expression of pro-inflammatory cytokines. Several research peptides, including KPV and BPC-157, have been studied for their potential to modulate NF-κB signaling, which is why they appear in inflammation-related preclinical research.
Any substance studied for its potential to enhance cognitive function, including memory, focus, creativity, or motivation. In peptide research, nootropic peptides include Semax, Selank, and Dihexa, which have been investigated in preclinical models for their effects on neuroplasticity, brain-derived neurotrophic factor (BDNF), and neuroprotection. These are sometimes called "brain peptides" in biohacking communities.
A peptide consisting of exactly 15 amino acid residues. BPC-157 is the most well-known pentadecapeptide in research peptide contexts. The term itself simply describes the chain length — "penta" (five) + "deca" (ten) + "peptide" — and is useful for understanding how peptide size relates to biological function and stability.
A short chain of amino acids (typically 2–50) linked by peptide bonds. Peptides are smaller than proteins and act as signaling molecules in the body, influencing processes such as hormone production, immune response, inflammation, and tissue repair. Research peptides are synthetically produced versions of these naturally occurring or modified sequences, used to study specific biological mechanisms in laboratory and preclinical settings.
The chemical bond that links two amino acids together in a peptide or protein chain. Formed through a dehydration reaction (removing a water molecule), peptide bonds create the backbone of every peptide sequence. The strength, stability, and configuration of peptide bonds influence a peptide's biological activity, half-life, and resistance to enzymatic breakdown.
The practice of combining two or more peptides in a research protocol with the goal of achieving complementary or synergistic effects. The most commonly discussed stack in peptide research communities is BPC-157 + TB-500 (often called the "Wolverine Stack"), where the peptides target different but related tissue repair pathways. Stacking increases complexity and unknowns, as peptide-to-peptide interactions are not yet well characterized in research.
A small endocrine gland at the base of the brain that regulates the release of numerous hormones, including growth hormone (GH). Many research peptides — particularly growth hormone secretagogues like ipamorelin and CJC-1295 — are studied for their ability to stimulate the pituitary gland's natural GH release, as opposed to introducing exogenous growth hormone directly.
In peptide research, a protocol refers to the structured plan outlining dosage, frequency, duration, route of administration, and cycling schedule for a given compound or stack. Research protocols vary widely and are discussed in scientific literature, community forums, and by healthcare professionals. No standardized human protocols exist for most research peptides due to the lack of FDA-approved clinical guidelines.
A synthetic peptide analog of alpha-melanocyte-stimulating hormone (α-MSH) that acts on melanocortin receptors in the brain. Unlike other sexual health compounds that act on the vascular system, PT-141 works through central nervous system pathways. A related compound (bremelanotide, sold as Vyleesi®) has received FDA approval for treating hypoactive sexual desire disorder in premenopausal women — making it one of the few peptide-adjacent compounds with regulatory approval.
In peptide research, purity refers to the percentage of the desired peptide present in a given sample, typically measured via HPLC. Research-grade peptides are generally expected to be ≥98% pure, with pharmaceutical-grade standards at ≥99%. Higher purity reduces the presence of impurities, degradation products, or truncated sequences that could affect research outcomes.
A protein molecule on the surface of or inside a cell that receives and responds to specific chemical signals (such as peptides, hormones, or neurotransmitters). When a peptide binds to its target receptor, it triggers a biological response. Understanding receptor specificity is central to peptide research — for example, ipamorelin's selectivity for the ghrelin receptor is what distinguishes it from less selective growth hormone secretagogues.
The process of dissolving a lyophilized (freeze-dried) peptide powder into a liquid solution — most commonly bacteriostatic water — to prepare it for research use. Proper reconstitution technique involves slowly adding the solvent along the vial wall to avoid damaging the peptide structure, then gently swirling (never shaking) until fully dissolved. Correct reconstitution is essential for maintaining peptide integrity and accurate dosing.
A synthetic peptide derived from the naturally occurring immunomodulatory peptide tuftsin, with an additional amino acid sequence to improve stability. Selank has been studied in preclinical and some clinical models (primarily in Russia) for its potential anxiolytic (anti-anxiety), nootropic, and immunomodulatory effects. It is categorized among "brain peptides" in biohacking communities.
A synthetic peptide analog of adrenocorticotropic hormone (ACTH 4-10) with additional amino acids for enhanced stability. Semax is one of the most discussed nootropic peptides in biohacking communities, studied in preclinical models for its effects on brain-derived neurotrophic factor (BDNF), neuroplasticity, and cognitive performance. It has been approved in Russia as a prescription medication for specific neurological conditions.
A series of molecular events inside a cell that transmits a signal from a receptor on the cell surface to the cell's interior, ultimately producing a specific biological response. Peptide research frequently focuses on mapping which signaling pathways a compound activates or inhibits — for example, BPC-157's interaction with nitric oxide (NO) pathways, or mTOR's role in protein synthesis.
A method of administration that delivers a substance into the fatty tissue layer just beneath the skin. Subcutaneous (SubQ) injection is the most commonly discussed route of administration for research peptides, as it allows for relatively slow, steady absorption into the bloodstream. Common injection sites discussed in research contexts include the abdominal area, thigh, and upper arm.
A synthetic peptide with an identical amino acid sequence to thymosin beta-4 (Tβ4), a naturally occurring 43-amino-acid protein involved in cell migration, cytoskeletal regulation, and inflammation modulation. TB-500 is studied extensively in preclinical models for tissue repair, angiogenesis, and anti-inflammatory signaling. It is frequently paired with BPC-157 in combination research protocols. Not FDA-approved for human use.
Protective caps of repetitive DNA sequences at the ends of chromosomes that shorten with each cell division. Telomere length is considered a biomarker of biological aging — shorter telomeres are associated with cellular senescence and age-related conditions. The peptide Epitalon is studied in research contexts for its potential to activate telomerase, the enzyme responsible for maintaining telomere length.
Independent laboratory analysis performed by a facility that has no financial interest in the product being tested. In the peptide industry, third-party testing (via HPLC, mass spectrometry, and endotoxin testing) is considered the standard for verifying product identity, purity, and safety. Reputable research peptide vendors publish third-party Certificates of Analysis for each batch.
A signaling protein that promotes the growth of new blood vessels (angiogenesis). VEGF expression is a commonly measured endpoint in peptide research, particularly in studies involving BPC-157 and TB-500. BPC-157 has been linked to upregulation of VEGF receptor-2 (VEGFR2) in experimental systems, while TB-500 has been associated with increased VEGF expression — suggesting distinct but potentially complementary mechanisms.
The international organization responsible for monitoring and combating doping in sport. WADA maintains the Prohibited List, which includes many peptide hormones, growth factors, and their analogs. Both BPC-157 and TB-500 fall under WADA's prohibited substance classifications. Athletes subject to anti-doping regulations should be aware that research peptides may trigger violations.
A popular term in peptide research communities for the combination of BPC-157 and TB-500, named after the Marvel character known for rapid healing. The concept behind this stack is that BPC-157's localized tissue repair mechanisms and TB-500's systemic cell migration and anti-inflammatory pathways may complement each other in preclinical models. While the name is informal, it reflects genuine scientific interest in how these two peptides may target different stages of the tissue repair process.
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