The one-page
“what’s what” of peptides.

New to all this? Start here. Carl boiled the whole rabbit-hole down to a single page — the vocabulary, the categories, and the rules that keep beginners out of trouble. Read it once and the rest of the guide stops looking like alphabet soup.

1 What a peptide even is

A peptide is just a short chain of amino acids — the same building blocks that make proteins, only smaller. Your body already uses hundreds of them as signals: “heal this,” “release that hormone,” “feel full.” Research peptides are lab-made copies of those signals, studied to see what happens when you add more of one. Most are not approved medicines — they’re sold for laboratory research only.

2 The words you’ll keep seeing

Reconstitution — mixing the freeze-dried powder with water so it can be measured & drawn.

Bacteriostatic water (BAC) — sterile water with a preservative; the standard mixing fluid.

mcg vs mg — 1 mg = 1000 mcg. Doses are often in mcg, vials labelled in mg.

IU — “international units,” used for some hormones; converts differently per substance.

Subcutaneous (subQ) — a small injection into the fat just under the skin.

Half-life — how long it stays active — decides how often it’s dosed.

Titration — starting low and increasing slowly to limit side-effects.

COA — Certificate of Analysis: a lab report showing purity & identity.

3 The six families at a glance

Family

What people reach for it — and examples

Healing & Recovery

Tissue, tendon & gut repair · BPC-157, TB-500, KPV

Fat Loss

Appetite & metabolism · Semaglutide, Tirzepatide, AOD-9604

Growth Hormone

Support natural GH output · CJC-1295, Ipamorelin, Sermorelin

Anti-Aging & Skin

Collagen, skin & longevity · GHK-Cu, Epithalon

Cognitive & Mood

Calm & focus · Selank, Semax

Specialized

Everything else · PT-141, MOTS-c

4 Carl’s five rules for beginners

Read before you buy. Understand the mechanism and the evidence first — this guide is for exactly that.

Proof over promises. A real COA beats a slick label. If there’s no batch report, be suspicious.

Measure twice. Reconstitution maths is the #1 rookie error. Use the calculator, then check it.

Start low, go slow. Lower doses, one variable at a time. You can always add; you can’t un-inject.

Talk to a clinician. None of this replaces medical advice. A real doctor beats a forum thread.

How to read a COA in 5 seconds: check the compound name matches, the purity (aim ≥98%), the batch/lot is present, and the lab is named. Missing any of those? Walk away.

Important: Peptide Carl is an independent educational resource. Nothing here is medical advice, a recommendation, or an offer to sell any substance. Many peptides discussed are not approved for human use and are restricted to laboratory research in most regions. Always consult a qualified clinician. Information is summarized from public literature and may be incomplete.

The one-page“what’s what” of peptides.

The one-page
“what’s what” of peptides.