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Research guides

112 guides covering individual molecules, head-to-head comparisons, handling and storage, and the documentation that should come with a lot.

A peptide is a short chain of amino acids, and most of what makes one awkward to specify or to handle follows from that. The sequence decides solubility, the mass printed on a vial is not a concentration, and the paperwork decides whether either figure can be relied on. These 112 guides work through those consequences one at a time — molecule by molecule, comparison by comparison, and across the handling and documentation questions that apply to all of them. Short definitions live in the glossary; the arithmetic lives in the calculators.

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In-depth guides

Comparisons

Research Peptide Stacks: Co-Formulated Blends vs Multi-Vial Kits Compared

Peptide stacks for research: co-lyophilized blends against multi-vial kits, why equal mass is not equal moles, copper and disulfide handling, and COA checks.

12 min read · 7 questions answered

Molecule guides

Oral Peptides: Capsules, Troches and Why Bioavailability Matters in Research Design

Why oral peptides show under 1% bioavailability, how enteric coating, arginate salts and sublingual troches change it, and when each format fits.

12 min read · 7 questions answered

Molecule guides

Topical Peptides in Cosmetic Research: GHK-Cu, Argireline, Matrixyl and Delivery

How topical peptides cross the stratum corneum: the 500-dalton rule, GHK-Cu vs Argireline vs Matrixyl, and percent-to-molarity worked examples.

11 min read · 7 questions answered

Molecule guides 78

Comparisons 24

Handling & storage 4

Documentation 3

Ordering & shipping 2

Methods 1

Peptide Solubility: Charge, pH, Hydrophobic Sequences and Solvent ChoicePeptide solubility from the sequence up: net charge at pH 7, isoelectric point, solvent choice by peptide character and DMSO co-solvent limits. 7 min