A reference shelf
for working researchers.
Calculators for peptide reconstitution, dilution maths, and molarity conversion. A nomenclature guide for amino acid one and three letter codes. A pharmacological glossary covering the terms used across our editorial and product pages. Methodology references on how third-party verification is performed. Free to use, no signup, no gate.
Bench tools.
The tools we kept needing at the bench, in one place. Reconstitution, dilution, molarity, all running in the browser, none of them asking you to sign up for anything. The calculations follow Ph. Eur. methodology where it applies.
Peptide reconstitution
calculator.
Calculate the volume of bacteriostatic water or sterile water needed to reach a target concentration. Vial mass, target concentration in mg/ml, output in ml. Cross-checks against typical bench reconstitution ranges.
Open calculator → Tool 02Dilution series
calculator.
Compute the volume of stock solution and diluent needed for any target concentration in a serial dilution. Useful for dose-response curves in cell culture and analytical work.
Open calculator → Tool 03Molarity conversion
calculator.
Convert between mass concentration (mg/ml) and molar concentration (M, mM, µM, nM) using the compound’s molecular weight. Critical for receptor-binding work and any assay that reports in molar units.
Open calculator → Tool 04Reconstitution
volume guide.
Quick reference for typical reconstitution volumes per vial size and target concentration. Includes notes on diluent selection (sterile water versus bacteriostatic water versus acetic-acid solutions).
Open guide →Reference texts.
Glossaries, nomenclature guides, and pharmacological references. Open in a tab, search the page, get the term, return to your work.
Peptide nomenclature
guide.
Amino acid one-letter and three-letter codes. Standard naming for peptide bonds, terminal modifications, salt forms, and post-translational modifications. The reference researchers reach for when reading sequences.
Open guide → Guide 06Pharmacological
glossary.
Definitions for thirty terms used across our editorial and product pages: HPLC, LC-MS, CLND, FTIR, endotoxin LAL, bioburden, lyophilization, IC50, K-d, agonist, antagonist, secretagogue, allosteric modulator, and others.
Open glossary → Guide 07Methodology
reference.
How Cresten verifies every batch. Janoshik Analytical’s methodology, Ph. Eur. specification references, the four-panel current testing scope, and the seven-panel target. Salt-form policy. Storage stability protocols.
Open methodology → Guide 08Reading a peptide
chromatogram.
A working researcher’s walkthrough of a typical HPLC chromatogram on a peptide COA. What the main peak, retention time, baseline drift, and minor peaks tell you. What is normal, what is a flag.
Read editorial → Guide 09Janoshik vs in-house
QA.
Why Cresten uses Janoshik Analytical for every batch instead of internal QA. The difference between in-house testing on supplier-provided samples and third-party verification on our own received stock.
Read editorial → Guide 10EMA guidance,
April 2026.
A reading of the European Medicines Agency’s most recent peptide guidance updates and what they signal for the EU research peptide market. Operating-phase reference, not legal advice.
Read editorial →Catalog and verification.
Direct paths into the catalog, the batch verification page, and the bulk inquiry channel.
Compounds
catalogue.
Twenty-six research compounds across tissue repair, longevity, neuropeptide and cognition, metabolic, and reproductive endocrinology research. Filterable by category. Each compound’s page links to its current batch COA.
Browse catalogue → 12Batch verification.
Verify any vial by entering the batch number printed on the aluminium crimp cap. Returns the published certificate of analysis for that batch: HPLC purity, LC-MS identity, endotoxin and bioburden results, analyst signature, with a permanent verification URL.
Verify a batch → 13Bulk inquiry / RFQ.
For institutional accounts, custom quantities, vial-size variants, multi-compound orders, or extended-scope analytical panels. Quote turnaround typically two to five business days. One line item or many.
Submit inquiry →