k.redgrave
TL2 Member · Aachen, DE
Based in the EU. Tracks what is available and funded locally, and dates every claim.
Joined 6 June 2025 · last posted 14d · groups: regional-eu
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A critique that turned out to be unfair, retracted by its author Replied, post #30 · Evidence › Study critique · 14 Jul 2026 · 14 likes Bias towards the null and bias away from the null: different criticisms have different directions. Differential dropout might bias away from null; conservative…
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Why we ask for units every single time, with three examples of what goes wrong Replied, post #114 · Start Here › How to Ask · 10 Jul 2026 · 0 likes Chromatogram questions: describe the method first. Column type, gradient, wavelength, detection method. Everything else follows from method. A chromatogram without…
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A 5 mg vial and a 0.25 mg dose: the arithmetic in full Replied, post #118 · Practice › Reconstitution · 10 Jul 2026 · 25 likes How much of the diluent volume the powder itself displaces: for a small peptide vial, the powder volume is negligible. For a larger vial or a kit with multiple…
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Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #56 · Analytics › Impurities & related substances · 7 Jul 2026 · 19 likes Aggregates: multiples of the monomer mass. May not elute at all under a standard reversed-phase method. A species that does not come off the column does not appear in…
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Journal club: what we got wrong in an earlier session Replied, post #26 · Evidence › Journal club · 24 Jun 2026 · 10 likes SURMOUNT-1 (N Engl J Med 2022): Tirzepatide obesity trial. The largest mean weight reduction for a pharmacological intervention at publication. Read the categorical…
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Research-use-only status: what it means legally and practically Replied, post #59 · Compounds › Other compounds · 16 Jun 2026 · 4 likes Naming conventions for research peptides cause confusion because suppliers do not follow a standard. The same compound gets different names from different suppliers. If…
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CJC-1295 with and without DAC: what the modification does Replied, post #85 · Compounds › Secretagogues & GH axis · 16 Jun 2026 · 0 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
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Transporting a vial for a weekend away — a second dataset Replied, post #79 · Practice › Storage & stability · 11 Jun 2026 · 7 likes Picking up post #76: that is the part I would want checked first. Freeze-thaw: some peptide solutions tolerate freezing poorly because ice crystals damage protein…
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What steady state means for the decision to escalate Replied, post #11 · Practice › Dosing & titration · 9 Jun 2026 · 6 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
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Analytical identity of BPC-157: a 15-mer with a simple mass — does this still hold? Replied, post #30 · Compounds › Repair & healing peptides · 8 Jun 2026 · 0 likes Analytical identity of BPC-157: a 15-residue peptide with an unambiguous mass (≈1419.5 Da). Identity confirmation by LC-MS is trivially easy, which means there is no…
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Tracking a shortage from primary sources rather than rumour Replied, post #41 · Access › Shortages · 8 Jun 2026 · 6 likes Shortage predictions: regulators and suppliers issue shortage alerts before they become acute. Checking the regulatory website for shortages gives you advance notice.
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MS/MS sequence confirmation: what it costs and when it is worth it — what changed since Replied, post #33 · Analytics › Mass spectrometry · 1 Jun 2026 · 16 likes Coming back to post #31, because the follow-up matters more than the original answer. Calibration matters: a high-resolution instrument out of calibration can report…