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    "title": "Why your peptide pen’s click dial quietly cheats your math",
    "entity": "Why your peptide pen’s click dial quietly cheats your math",
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    "tldr": "A reusable peptide pen holds a swappable 3 ml glass cartridge and meters with a click dial. Dead volume and click drift are where the concentration math slips.",
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            "id": "why-peptide-pen-s-click-dial-quietly-cheats-math:title",
            "category": "identity",
            "entity": "Why your peptide pen’s click dial quietly cheats your math",
            "attribute": "title",
            "value": "Why your peptide pen’s click dial quietly cheats your math",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
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            "value": "2026-08-22",
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            "value": "peptide pen, reconstitution, research, reusable peptide pen",
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            "category": "content",
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            "value": "A reusable peptide pen holds a swappable 3 ml glass cartridge and meters with a click dial. Dead volume and click drift are where the concentration math slips.",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
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            "attribute": "section",
            "value": "What it is",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
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            "attribute": "section",
            "value": "What a reusable peptide pen actually is",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
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            "category": "content",
            "entity": "Why your peptide pen’s click dial quietly cheats your math",
            "attribute": "section",
            "value": "The number that actually matters: dead volume and click drift",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
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            "category": "content",
            "entity": "Why your peptide pen’s click dial quietly cheats your math",
            "attribute": "section",
            "value": "Metal vs plastic pen bodies: the real trade-off",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math"
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            "attribute": "section",
            "value": "Cartridge tolerances, diluent, and cold storage",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math"
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            "value": "What the research community gets wrong about peptide pens",
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            "attribute": "section",
            "value": "Related reading",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
            "evidence": "https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math"
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            "category": "source",
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            "attribute": "cites",
            "value": "Bohannon, Postgrad Med 1999: Insulin delivery using pen devices. Simple-to-use tools may help young and old alike - pubmed.ncbi.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
            "evidence": "https://pubmed.ncbi.nlm.nih.gov/10560468/"
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            "category": "source",
            "entity": "Why your peptide pen’s click dial quietly cheats your math",
            "attribute": "cites",
            "value": "Jonker et al., Int J Clin Pharmacol Ther 2021: First pre-filled pen device with highly purified human menopausal gonadotropin (HP-hMG, Menopur) in liquid is shown to be bioequivalent to powder for reconstitution - pmc.ncbi.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
            "evidence": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8594316/"
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            "category": "source",
            "entity": "Why your peptide pen’s click dial quietly cheats your math",
            "attribute": "cites",
            "value": "Lingen et al., Endocr Connect 2023: Advantages and disadvantages of connected insulin pens in diabetes management - pmc.ncbi.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
            "evidence": "https://pmc.ncbi.nlm.nih.gov/articles/PMC10563601/"
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            "attribute": "cites",
            "value": "Bacteriostatic Water for Injection, USP: FDA label on DailyMed, U.S. National Library of Medicine (0.9% benzyl alcohol) - dailymed.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
            "evidence": "https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=87d6e9dc-fe3b-4593-ac9a-d7493d1959c7"
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            "id": "why-peptide-pen-s-click-dial-quietly-cheats-math:source-www-sigmaaldrich-com",
            "category": "source",
            "entity": "Why your peptide pen’s click dial quietly cheats your math",
            "attribute": "cites",
            "value": "Sigma-Aldrich (Merck): Handling and Storage Guidelines for Peptides and Proteins - www.sigmaaldrich.com",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
            "evidence": "https://www.sigmaaldrich.com/US/en/technical-documents/technical-article/research-and-disease-areas/cell-and-developmental-biology-research/handling-and-storage"
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            "id": "why-peptide-pen-s-click-dial-quietly-cheats-math:product-gansulin-metal-peptide-pen",
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            "value": "Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units)",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/why-peptide-pen-s-click-dial-quietly-cheats-math)",
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            "value": "Gansulin-Compatible 3 ml Glass Cartridge for Pens (10-Pack)",
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            "q": "How accurate is a click-dial peptide pen compared to a syringe?",
            "a": "A click dial removes the guesswork of reading syringe markings, but spring-driven pens can lose a small amount of force as the cartridge empties, so clicks late in a cartridge may deliver slightly less than clicks early on."
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            "q": "Do I need to change the needle on a reusable peptide pen every time?",
            "a": "Yes. The needle is single-use even though the pen barrel is reusable. Reusing a needle can core the septum and change the dead volume trapped in the hub."
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            "q": "Why use bacteriostatic water instead of plain sterile water in a pen cartridge?",
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