Peptide Research Glossary

Building block of peptides and proteins. Peptides are usually 2–50 amino acids linked together.

Lab-made version of a natural peptide, tweaked to change stability, half-life, or receptor activity. Most research peptides are analogues.

Sterile water with 0.9% benzyl alcohol. Standard diluent for reconstitution. Preservative keeps multi-dose vials usable ~25–30 days refrigerated.

How much of a dose actually reaches circulation in active form. SubQ injection beats oral for most peptides because the gut destroys them first.

One vial with two or more peptides at a fixed ratio. Reconstitute once; every dose gives the same proportion. See Blends.

Body Protection Compound-157. 15-amino acid peptide studied for tissue repair, gut healing, and inflammation. One of the most discussed recovery peptides.

Vendor document showing purity/identity testing (HPLC, mass spec). Useful. Not the same as pharmaceutical-grade sterility or accuracy.

Peptide per unit volume after mixing. Total peptide ÷ BAC water (e.g. 5 mg ÷ 2 mL = 2.5 mg/mL). Determines draw volume per dose.

Modified GHRH analogue. "No DAC" = short acting (~30 min). "With DAC" = binds albumin, much longer half-life. Often paired with Ipamorelin.

Albumin-binding modification on CJC-1295 that stretches half-life from minutes to roughly a week.

Liquid you dissolve powder in. Usually BAC water. Sterile water and saline are alternatives with different shelf-life rules.

How effect changes with dose. Too little = nothing. Sweet spot = benefit. Too much = diminishing returns and more side effects.

191-amino acid pituitary hormone. Research form often called HGH or somatropin. Dosed in IU, not mg, on many labels.

Hypothalamic signal that tells the pituitary to release GH. Analogues like CJC-1295 and Sermorelin mimic it.

Peptides that trigger GH release via ghrelin receptors. GHRP-2, GHRP-6, Ipamorelin. Often stacked with GHRH analogues.

Incretin hormone affecting insulin, appetite, and gastric emptying. Agonists like semaglutide and tirzepatide mimic it.

Time for blood concentration to drop by half. Short half-life = inject more often. Long half-life = less frequent dosing.

Into muscle tissue. Some protocols (HCG, certain GH setups) specify IM. Longer needle, faster absorption than SubQ.

Selective GHRP with minimal cortisol/prolactin bump. Common partner for CJC-1295 in blends and stacks.

Measures biological potency, not mass. Used for HGH and HCG. Not the same as syringe "units." ~3 IU ≈ 1 mg somatropin for HGH.

Freeze-drying. Removes water under vacuum to make stable powder. How research peptides ship. Must reconstitute before use.

One thousandth of a milligram. Many doses are in mcg. Written µg sometimes.

Vial labels usually show total peptide in mg (e.g. "BPC-157 5mg").

Liquid volume. Same as 1 cc. On U-100 syringes, 1 mL = 100 units.

Link between two amino acids. The backbone of every peptide chain.

Documented plan: dose, frequency, route, mixing instructions, duration. What we publish on peptide.diy.

Cell protein a peptide binds to, triggering a downstream effect. Different peptide, different receptor, different outcome.

Adding diluent to lyophilized powder to make a measurable liquid. See the Reconstitution Guide.

Multiple vials on one coordinated schedule. You control dose and timing for each compound separately. See Stacks.

Injection into fat under the skin. Default route for most peptide protocols.

Synthetic fragment related to Thymosin Beta-4. Studied for cell migration, wound healing, and inflammation.

Insulin syringe where 100 units = 1 mL. Comes in 1 mL, 0.5 mL, and 0.3 mL barrels. See Deployment Methods.