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    "tldr": "Refilling a GLP-1 research pen: a fact-check of Reddit on 3 ml glass cartridges, the U-100 scale (100 units = 1 ml), dialing units and planning refills.",
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            "value": "Units and dialing",
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            "value": "Related reading",
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            "value": "What the research community gets wrong about refilling a research pen with 3 mL cartridges",
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            "value": "Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units)",
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            "value": "NovoLog (insulin aspart) , FDA/DailyMed label confirming 100 units/mL (U-100) and 3 mL PenFill cartridge delivery device - dailymed.nlm.nih.gov",
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            "value": "Humalog (insulin lispro) , FDA/DailyMed label confirming 100 units/mL (U-100) and 3 mL single-patient-use cartridges - dailymed.nlm.nih.gov",
            "source": "Lab article (https://www.preppinpeppers.com/blogs/the-lab/glp1-peptide-pen-cartridge-reddit)",
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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/glp1-peptide-pen-cartridge-reddit)",
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            "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/glp1-peptide-pen-cartridge-reddit)",
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            "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/glp1-peptide-pen-cartridge-reddit)",
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            "q": "Why do reconstitution pens use 3 mL cartridges?",
            "a": "Precision click-dial pens are engineered to accept standard 3 mL glass cartridges, so reconstitution math and refill schedules are conventionally built around that volume for precision and reproducibility."
        },
        {
            "q": "What does U-100 mean on a peptide research pen?",
            "a": "U-100 means 100 units fit in every 1 mL of liquid. Units act like ruler tick marks, letting researchers dial to the same position each draw for consistent, repeatable volume delivery."
        },
        {
            "q": "How do I calculate how many draws a 3 mL cartridge holds?",
            "a": "Divide total cartridge volume by units per draw (3 mL = 300 U-100 units). A peptide calculator planner can automate this and generate a full refill schedule from a single compound or blend entry."
        }
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