A weekly dosing schedule from a phase 2 trial tells you nothing about a concentration in a well. This post explains what half-life means without a circulatory system, why serum albumin changes free concentration, and how to read trial papers without importing the wrong numbers.
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Aggregation changes no mass and no purity figure, so no certificate can catch it. This post covers what drives peptides to associate, which sequences are most at risk, how to spot it, and the handling habits that prevent it.
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A dose-response curve is only as good as the stock it came from. This post covers choosing a concentration range, why serial dilution propagates a single error through every point, what controls the peptide itself demands, and what to record.
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Bacteriostatic water is the default, not the only answer. This post covers when plain sterile water is correct, when a buffer is needed, what to do with a peptide that will not dissolve, and why the choice belongs in your methods section.
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Two 5 mg vials can hold twice as many molecules as each other. This post explains why receptor work needs molar concentration rather than mass, how to convert a vial to nanomoles and micromolar, and a table of molar amounts for every vial size in the catalogue.
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Once a lyophilized vial is reconstituted the clock starts. This post covers what actually degrades a peptide in solution, why the answer depends on the sequence rather than the label, what bacteriostatic water does and does not protect against, and how to decide a working window for your own material.
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Semaglutide, tirzepatide and retatrutide carry a fatty-acid side chain that makes them bind albumin and last for days. The same chain makes the lyophilized powder slow to wet and dissolve. What the chain is, why it slows dissolution, and a reconstitution method that works without shaking.
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Almost every research peptide arrives as a trifluoroacetate salt, because TFA is used to cleave and purify it. The counter-ion is part of the powder's weight and, for some cell work, part of the result. What the salt form is, how much TFA a given peptide can carry, the evidence that it affects cells, and when to ask for acetate.
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A blend fixes the ratio and saves a vial; single compounds let you vary the ratio and run each arm alone. Choose the blend when the ratio comes from prior work and the singles when the ratio is the question. With the four-arm design, reconstitution arithmetic at three volumes, and how to read a blend certificate.
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NAD+ is a dinucleotide cofactor, not a peptide, and it behaves differently on the bench. It is used at millimolar concentrations, it is hygroscopic as a powder, and in solution its stability depends on the buffer far more than on temperature. What the 2024 stability data show, how to store the powder, and how to make and keep a stock.
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Three research compounds act on the growth hormone axis by two different routes. Ipamorelin is a five-residue secretagogue at the GHS receptor; CJC-1295 and tesamorelin are GHRH analogues at the GHRH receptor, one long-acting through albumin binding and one through an N-terminal modification. Receptor, size, duration and the literature for each, and how the three combine in a design.
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Two different compounds are sold under the name CJC-1295. One carries a Drug Affinity Complex that binds albumin and acts for days; the other is the bare 29-residue GRF analogue that acts for minutes. What the difference is, how the literature describes each, and how the certificate tells them apart.
Read the post →The blog covers buying, handling and research-design questions as they come up. The evergreen material lives in the guides: reconstitution, reading a certificate of analysis, storage and stability, one research guide per compound and the glossary.
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