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Guides
Short, sourced explanations of the ideas behind the tools and the app: what a half-life does to a level curve, what the numbers on a vial mean, what a titration schedule is, what to log and what to ask. Written for a smart adult following a prescriber's plan. Nothing here is dosing guidance.
How to read an estimated level curve
What half-life, accumulation and steady state mean on STACK's estimated level curve, why it is an estimate, not a blood level, and how weekly and daily differ.
Explains the peptide calculatorHow peptide reconstitution works: mg, mL, units and concentration
The arithmetic behind a reconstituted vial: mg, mL, mg/mL, mcg, and what a 'unit' on a U-100 insulin syringe means. A worked example, no dosing.
Explains the titration plannerUnderstanding a titration schedule
What titration, escalation, step and maintenance mean, why GLP-1 labels step up gradually, and how to record the plan your prescriber gave you.
Explains the level simulatorGLP-1 half-lives compared
Half-lives of exenatide, lixisenatide, liraglutide, dulaglutide, semaglutide, tirzepatide and retatrutide from FDA labels, and what they mean for the curve.
BackgroundGLP-1 side effects: what the labels list and what to track
Side effects and warnings from the FDA labels for semaglutide, tirzepatide and liraglutide, what to log in STACK, and when the labels say to call or get help.
BackgroundInjection site rotation: why labels say to rotate, and how STACK tracks sites
Why GLP-1 and insulin labels say to rotate injection sites, what lipohypertrophy is, the sites labels name, and how STACK records each site. No dosing.
BackgroundWhat is a peptide stack?
What a peptide is, what people mean by a stack, and why STACK tracks each prescribed compound separately with its own half-life, units, schedule and sites.
BackgroundPeptide therapy: questions to ask a clinic before you start
Questions for any peptide or GLP-1 clinic: prescriber licensing, real prescriptions, 503A vs 503B pharmacies, research-only labels, how to report problems.