Glossary

A substance that binds to a receptor and activates it, producing a biological response. For example, GLP-1 agonists like Semaglutide bind to GLP-1 receptors to reduce appetite.

The building blocks of peptides and proteins. There are 20 standard amino acids that combine in different sequences to form peptides with specific functions.

Sterile water containing 0.9% benzyl alcohol, which prevents bacterial growth. Used to reconstitute peptides and allows the solution to be used over multiple doses. Different from sterile water, which should only be used once.

The percentage of a compound that reaches systemic circulation and is available to produce effects. Injectable peptides typically have near 100% bioavailability, while oral forms are often much lower due to digestive breakdown.

A peptide sequence originally isolated from human gastric juice. BPC-157 is a synthetic version known for accelerating tissue healing, reducing inflammation, and supporting gut health through multiple mechanisms.

Alternating periods of using a compound with periods of rest. Cycling prevents receptor desensitization and maintains effectiveness. Common patterns include 5 days on / 2 days off, or 8 weeks on / 4 weeks off.

Taking a compound on an empty stomach, typically 2+ hours after eating. Many GH secretagogues work best when taken fasted, as food (especially carbs and fats) can blunt the GH response.

A compound that stimulates the pituitary gland to release growth hormone (GH). These include GHRH analogs (like CJC-1295) and ghrelin mimetics (like Ipamorelin). They amplify your body's natural GH production rather than replacing it.

A hormone produced by the hypothalamus that signals the pituitary to release growth hormone. Synthetic analogs like CJC-1295 and Sermorelin mimic GHRH to stimulate GH release.

A class of peptides that stimulate GH release by mimicking ghrelin and binding to the ghrelin receptor. Examples include Ipamorelin and GHRP-6. Often used in combination with GHRH analogs for synergistic effects.

A hormone released by the gut after eating that reduces appetite, slows gastric emptying, and improves insulin sensitivity. GLP-1 agonists like Semaglutide and Tirzepatide are used for weight management and diabetes.

Medications that mimic the GLP-1 hormone to reduce appetite and improve blood sugar control. Examples include Semaglutide (Ozempic/Wegovy), Tirzepatide (Mounjaro), and Retatrutide. Typically administered weekly.

A hormone produced by the pituitary gland that stimulates growth, cell reproduction, and regeneration. GH secretagogues stimulate natural GH production, while HGH therapy involves direct hormone replacement.

The time it takes for half of a compound to be eliminated from your body. Short half-life peptides (like Ipamorelin) require more frequent dosing, while long half-life versions (like CJC-1295 with DAC) can be dosed weekly.

A hormone produced primarily in the liver in response to growth hormone. IGF-1 mediates many of GH's anabolic effects on muscle, bone, and tissue. Blood IGF-1 levels are often used to assess GH status.

A small syringe with a fine needle (typically 29-31 gauge) designed for subcutaneous injections. Commonly used for peptide administration due to accurate dosing markings and minimal discomfort.

An injection method where the needle penetrates deeper into muscle tissue. Some compounds like Cerebrolysin and certain B12 preparations are administered intramuscularly for better absorption or to reduce injection site reactions.

An initial period of higher or more frequent dosing to quickly build up tissue concentration. Some protocols for TB-500 and Melanotan use loading phases (e.g., 2 weeks of daily dosing) before transitioning to maintenance.

A preservation method where peptides are frozen and then dried under vacuum. This creates a stable powder that can be stored longer than liquid solutions. Most peptides ship in lyophilized form.

A lower, ongoing dose used after an initial loading phase to maintain benefits. For example, TB-500 might use 2.5mg twice weekly during loading, then 2.5mg weekly for maintenance.

A coenzyme essential for cellular energy production, DNA repair, and the function of sirtuins (longevity proteins). NAD+ levels decline with age, leading to interest in precursors like NMN and NR, or direct NAD+ supplementation.

A substance that enhances cognitive function, including memory, focus, creativity, or motivation. Peptide nootropics like Semax and Selank work by modulating neurotransmitters and supporting brain-derived neurotrophic factor (BDNF).

A short chain of amino acids (typically 2-50) linked by peptide bonds. Peptides act as signaling molecules in the body, triggering specific biological responses like tissue repair, hormone release, or immune modulation.

Dosing a compound to mimic the body's natural patterns of hormone release. Growth hormone is naturally released in pulses, so many GH secretagogue protocols aim to enhance these natural pulses rather than maintain constant levels.

A protein on or inside cells that binds to specific molecules (like peptides) and triggers a biological response. Different peptides target different receptors to produce their effects.

A reduction in receptor responsiveness after prolonged exposure to an agonist. This is why cycling is recommended for some peptides - taking breaks allows receptors to regain sensitivity.

The process of mixing lyophilized (freeze-dried) peptide powder with bacteriostatic water to create an injectable solution. Proper technique involves slowly adding water to the vial wall to avoid damaging the peptide.

The practice of combining multiple peptides or compounds in a protocol to achieve synergistic effects. For example, stacking CJC-1295 with Ipamorelin creates a stronger GH response than either alone.

An injection method where the needle is inserted into the fatty tissue just beneath the skin, typically in the abdomen, thigh, or upper arm. Most peptides are administered via subcutaneous injection using insulin syringes.

A synthetic fragment of Thymosin Beta-4, a naturally occurring peptide involved in tissue repair and regeneration. Known for promoting flexibility, reducing inflammation, and accelerating wound healing.

The practice of gradually increasing dosage over time to find the optimal dose while minimizing side effects. Common with GLP-1 agonists like Semaglutide, which typically start at 0.25mg and increase every 4 weeks.