Research, Foundational Guides
Foundational Guides
Evergreen primers on the science that underpins every peptide hub. Pharmacokinetics, routes of administration, structural modifications, and how to read the underlying literature.
- 10 min
What Are Research Peptides? A Scientific Primer
Peptides are short chains of amino acids that sit between small-molecule drugs and large biologics in size and complexity. This guide explains how they are defined, why they are pharmacologically attractive, what makes them difficult to develop, and how to interpret 'research-use-only' in the current regulatory environment.
Read guide - 11 min
Peptide Half-Life: How It's Measured and Why It Matters
Terminal elimination half-life (t1/2) determines dosing intervals, time to steady state, and peak-to-trough variability. This guide explains how t1/2 is measured, why half-life and duration of action differ, and how modern peptide engineering extends half-life through DPP-4 protection, albumin binding, PEGylation, and depot formulations.
Read guide - 10 min
Peptide Bioavailability Explained
Bioavailability (F) is the fraction of a drug that reaches systemic circulation unchanged. For peptides, oral bioavailability is typically below 2% because the gastrointestinal tract digests them. This guide explains the barriers, compares routes of administration, and covers the absorption enhancer strategies that enabled oral semaglutide (Rybelsus).
Read guide - 12 min
Routes of Administration: Subcutaneous vs Intramuscular vs Intranasal
The route of administration determines how quickly a peptide is absorbed, how much reaches systemic circulation, and how practical the treatment is for patients. This guide covers subcutaneous, intramuscular, intranasal, oral, inhaled, and transdermal delivery of peptides, with attention to absorption physiology, worked examples, and the clinical trade-offs each route involves.
Read guide - 11 min
Structural Modifications: Acylation, PEGylation, and Aib Substitution
Native peptides are pharmacologically attractive but pharmacokinetically fragile: they are cleaved by proteases within minutes and cleared by the kidneys before reaching their targets. This guide explains the three main structural strategies used to extend peptide half-life: Aib (alpha-aminoisobutyric acid) substitution to block DPP-4, fatty acid acylation to exploit albumin binding, and PEGylation to increase hydrodynamic size. Real drug examples illustrate each approach.
Read guide - 10 min
Understanding Pharmacokinetics: Cmax, Tmax, AUC, and Half-Life
Pharmacokinetic parameters like Cmax, Tmax, AUC, and half-life appear in nearly every drug study, yet their meaning is rarely explained outside a pharmacy textbook. This guide defines each parameter, shows how they relate mathematically, and explains what they mean practically for dosing intervals, drug accumulation, and how to interpret results across special populations.
Read guide - 13 min
Reading PubMed: A Guide for Non-Scientists
PubMed is the world's largest free-access database of biomedical research, but navigating it well requires knowing how to search, how to filter, and how to read what you find with appropriate skepticism. This guide walks through the anatomy of a PubMed record, effective search strategies, how to read an abstract critically, how to distinguish study types, and how to find full text when you need it.
Read guide - 15 min
GLP-1 Receptor Agonists: A Complete Primer
GLP-1 receptor agonists are among the most studied and prescribed drugs in endocrinology. This primer covers the underlying hormone biology, the receptor and its downstream effects, every major approved drug in the class with key differences, pivotal cardiovascular outcomes trials, dual and triple agonists, the class boxed warning, the GI side effect profile, and where the science is heading.
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