Guide

The Beginner's Complete Guide to Research Peptides

This is the page to read first. It covers what peptides actually are, how they differ from the compounds they get confused with, the practical workflow of research — reconstitution, measurement, storage — and the Canadian context for sourcing all of it. Every section links to a deeper guide.

What is a peptide?

A peptidePeptideA short chain of amino acids — typically 2 to 50 — linked by peptide bonds. Peptides act as signaling molecules, telling cells and systems what to do, which is why they are widely studied in research.See glossary → is a short chain of amino acidsAmino acidThe chemical building block of peptides and proteins. Peptides are short chains of amino acids linked together by peptide bonds.See glossary → — usually between 2 and 50 — connected by peptide bondsPeptide bondThe chemical bond linking one amino acid to the next in a peptide chain.See glossary →. Shorter than a protein, bigger than a simple molecule. Your body runs on them: insulin is a peptide, and so are the hormones that regulate appetite, growth, sleep, and repair.

What makes peptides interesting to researchers is specificity. Each peptide is a message addressed to particular receptorsReceptorA protein on or inside a cell that binds specific signaling molecules and triggers a response. Most peptides work by binding particular receptors.See glossary → — it binds where it fits and does one job. Research peptides are synthetic copies (or engineered variants) of those messages, studied for what happens when a given signal is amplified.

How peptides differ from steroids and hormones

The practical consequence: most peptides studied in research don't carry the shutdown-and-recovery cycle dynamics that define steroid use. They are different tools asking different biological questions.

How peptides are administered in research

• SubcutaneousSubcutaneous (SubQ)An injection into the fatty tissue just below the skin. The most commonly referenced administration route in peptide research literature.See glossary → injection — the dominant route in the literature. Peptides are digested if swallowed, so injection into the fatty layer under the skin preserves bioavailabilityBioavailabilityThe fraction of a compound that reaches circulation intact after administration. Injection routes typically show much higher bioavailability than oral or nasal routes for peptides.See glossary →.
• Intranasal — used for brain-targeted peptides like Semax and Selank, where the nasal route offers a path toward the central nervous system.
• Oral / topical — a few exceptions: BPC-157 is studied orally for gut-local effects, and GHK-Cu is mostly a topical story. For everything else, oral means destroyed.

Why peptides arrive freeze-dried

Peptides in solution degrade in weeks. The same molecules freeze-driedLyophilizedFreeze-dried. Peptides are shipped as a lyophilized powder ('puck') because the dry form is far more stable than a solution. It must be reconstituted before use in research.See glossary → last one to two years refrigerated. So every vial ships as dry powder, and the researcher adds bacteriostatic waterBAC water (bacteriostatic water)Sterile water containing 0.9% benzyl alcohol, which suppresses bacterial growth. It is the standard diluent used to reconstitute lyophilized peptides for multi-dose research vials.See glossary → before use — a five-minute process called reconstitutionReconstitutionThe process of mixing a freeze-dried (lyophilized) peptide powder with bacteriostatic water to create a solution of known concentration.See glossary → with exactly one piece of math in it:

Concentration (mcg/mL) = vial (mg) × 1000 ÷ water added (mL)

From there, every dose is: target mcg ÷ concentration = mL to draw, and mL × 100 = U-100U-100 syringeAn insulin syringe calibrated so that 100 units equal 1 mL. The standard syringe referenced in peptide research; each unit equals 0.01 mL.See glossary → syringe units. The reconstitution guide walks the full procedure; the syringe guide decodes the markings.

The RUO reality

Everything sold outside a pharmacy is Research Use OnlyRUO (Research Use Only)A regulatory classification meaning a product is sold strictly for laboratory research and is not approved, labeled, or intended for human or veterinary use.See glossary →: lawful to sell as a laboratory chemical, not approved for human use, and never evaluated by Health Canada for safety or sterility. Three consequences follow:

1. Quality is the vendor's testing, nothing more. A batch-specific COACOA (Certificate of Analysis)A lab document reporting what a specific batch actually contains — typically purity by HPLC and identity by mass spectrometry. Reputable research vendors publish batch-specific COAs.See glossary → from an independent lab — showing HPLCHPLC (high-performance liquid chromatography)A laboratory technique that separates the components of a sample to measure purity. The standard method used on peptide COAs to report a purity percentage.See glossary → purity and mass-spec identity — is the minimum bar. No COA, no purchase.
2. Some compounds are also prescription drugs (semaglutide, tirzepatide) — a distinct legal category covered in Are Peptides Legal in Canada?
3. Dosing information is research literature, not instructions. Pages on this site describe what published protocols used — presented so researchers can understand the literature, not as recommendations.

The beginner's workflow

1. Learn the compound. Read its profile page — mechanism, referenced protocols, half-life, storage.
2. Source in Canada. A domestic vendor with published COAs removes customs risk and the worst quality risk. Start with the vendor directory.
3. Get the supplies. BAC water, U-100 syringes, swabs, sharps container — the supplies guide covers all of it.
4. Do the math once, correctly. Use the calculator; write the concentration on the vial.
5. Store cold, dated, dark. The storage guide has the windows.
6. Track everything. Dose, timing, batch, observations. A protocol you didn't record is a protocol you can't learn from — this is what My Peptide Protocol exists for.

Mistakes that define the learning curve

• Unit/mcg confusion — the classic. Units measure volume; mcg depend on your reconstitution. One number without the other is meaningless.
• Shaking the vial — swirl gently instead.
• Sterile water in a multi-week vial — it lacks preservative; the vial is referenced as stable for days, not weeks.
• Skipping the COA check — the single highest-leverage quality habit in all of peptide research.
• Starting at full literature doses — published protocols themselves titrate. Start low, go slow is how the trials were designed.