the dosage guide,
week by week.
Every Veyvora pen doses in audible clicks. Pick a compound, the guide below reproduces the printed dosing card and published titration reference for weeks 1–4, 4–8 and 8+.
Overview
A peptide dosing schedule is a staged research reference that sets out the material quantity and measurement method for defined time periods, covering phases such as weeks 1–4, weeks 4–8 and week 8 onwards, without establishing a human-use regimen. All materials, specifications and calculations described here are for laboratory and in-vitro research use only.
Research pen specifications translate a labelled total mass and solution volume into per-click quantities that laboratory researchers can apply consistently across a protocol. On the 3 mL / 300-click format standard across ISO-style research pens, each mechanical click corresponds to a nominal 0.01 mL of solution [2]. Dividing the pen’s total labelled mass by 300 gives the mass per click: a 40 mg pen yields 133 µg per click; a 20 mg pen yields 67 µg per click [2]. These figures are device parameters, not dose recommendations.
Veyvora’s 2026 pen cards pre-compute per-click values directly from labelled content, giving laboratory researchers a single verified reference point rather than requiring manual arithmetic at the bench [1]. Every figure on those cards must be reconciled against the batch certificate of analysis (CoA) before use, because mechanical scale and nominal content must agree with the released batch record for calculations to be valid [3].
Technical Scope
A research pen specification is a label-derived device reference that records total peptide mass, solution volume and mechanical increment, giving laboratory researchers a verified basis for unit conversion without constituting a dosing guide, titration scheme or human-use instruction.
On the 3 mL / 300-click format standard across ISO-style research pens, each audible click corresponds to a nominal 0.01 mL of solution [2]. Dividing the pen’s total labelled mass by 300 yields the mass per click: a 40 mg pen delivers 133 µg per click; a 20 mg pen delivers 67 µg per click [2]. These are device parameters derived from the label, not recommendations for any quantity to be administered.
Veyvora’s 2026 pen cards pre-compute per-click values directly from labelled content, providing a single verified reference point rather than requiring manual arithmetic at the bench [1]. Before applying any figure from those cards, researchers should verify a batch against its CoA to confirm that the released batch record agrees with the nominal specification; where batch testing alters nominal content, card figures must be treated as provisional until reconciled [3]. For a fuller account of what purity data does and does not establish, how HPLC purity should be interpreted provides the relevant analytical context.
Verified Pen or Product Specifications
Verified pen specifications must be drawn from the product label, structured product data or a released batch record, not from marketing copy or third-party posts. The minimum set of values a researcher needs before performing any click calculation is: total peptide mass (mg or µg), total solution volume (mL), and total mechanical clicks.
Veyvora Pen Format Reference
Veyvora’s 2026 pen cards publish the following label-derived values [1]:
| Product | Total mass | Volume | Total clicks | Per-click mass |
|---|---|---|---|---|
| Tirzepatide 40 mg | 40 mg | 3 mL | 300 | 133 µg |
| Retatrutide 40 mg | 40 mg | 3 mL | 300 | 133 µg |
| Tesamorelin 20 mg | 20 mg | 3 mL | 300 | 67 µg |
| NAD+ 1000 mg | 1,000 mg | 3 mL | 300 | 3.33 mg |
Values reproduced from Veyvora’s published pen cards (2026). Operators must confirm figures against the current label and batch record before use; where batch testing alters nominal content, card figures are provisional until reconciled.
The 3 mL / 300-click format is consistent with ISO-style research cartridges, where each click corresponds to a nominal 0.01 mL [2]. Any pen deviating from this mechanical scale requires independent confirmation of its click volume before the per-click mass formula applies.
For compounds not listed above, the per-click value is unavailable here and must be sourced directly from the product label or batch documentation. Researchers handling reconstituted or temperature-sensitive formats should consult storage and stability guidance alongside these figures. Those comparing compound formats across Veyvora’s range may find the retatrutide versus tirzepatide comparison useful for receptor and evidence context.
All specifications above are laboratory device parameters for in-vitro research use only.
Unit-Conversion Method
Unit conversion for research pens follows a three-step sequence: establish the concentration in mg/mL from the label, derive the mass per click from the mechanical scale, then apply simple ratios to move between mass, volume and clicks [2].
Step 1, Concentration
Concentration (mg/mL) = total peptide mass (mg) divided by solution volume (mL) [2].
For a 40 mg / 3 mL pen, this gives 13.33 mg/mL. Once concentration is known, the mass in any sub-volume follows directly: mass (mg) = concentration (mg/mL) multiplied by volume (mL) [2].
Step 2, Per-Click Mass
On a 3 mL / 300-click pen, each click corresponds to a nominal 0.01 mL [2]. Per-click mass (mg) = total mass (mg) divided by 300. For the Tirzepatide 40 mg pen this yields 0.133 mg (133 µg) per click; for the Tesamorelin 20 mg pen, 0.067 mg (67 µg) per click [1].
Step 3, Clicks for a Target Mass
Clicks required = target mass (mg) divided by per-click mass (mg/click) [2]. Doses per pen = total pen mass (mg) divided by target mass (mg). ResearchPeptideCalculator (2026) applies this arithmetic directly and includes an explicit reminder to verify outputs against the actual pen label, because mechanical scales vary between devices [3].
All derived values should be recorded in laboratory notebooks alongside the underlying label figures and equations, so that calculations remain reproducible and traceable to their source document [2]. Researchers working with compounds outside the table above should source per-click values from the relevant product label or batch record before applying these ratios; the retatrutide research profile provides compound-specific context without extending into schedule or administration territory.
All conversions described here are dimensional arithmetic for laboratory and in-vitro research use only.
Label and Batch-Document Reconciliation
Click calculations are only as reliable as the specification values they draw from, so every derived figure must be traceable to the released batch record and packaging documentation for that specific SKU (stock-keeping unit). Where a discrepancy exists between a pen card, a web specification and the internal batch record, the batch record takes precedence and the discrepancy should be investigated before any laboratory work proceeds [4].
Reconciliation for a research pen must confirm four values against the batch record: total labelled mass (mg), total solution volume (mL), total mechanical clicks and the resulting per-click mass. A batch update or re-test that changes the nominal content requires any calculator parameterised from the previous specification to be updated accordingly; assuming a universal 3 mL / 300-click standard without batch-level confirmation introduces unquantified error [2].
For Veyvora batches, researchers can verify a batch against its CoA by matching the batch number printed on the pen or vial to the published certificate before use. Veyvora states that every batch is independently checked by two laboratories using HPLC, mass spectrometry and endotoxin assay, with an assay-purity threshold above 98% [1]. For a fuller account of what HPLC measures and what it does not prove, how HPLC purity should be interpreted provides the relevant analytical context without overclaiming from a single percentage figure.
Reconciliation is a documentation and quality-assurance activity for laboratory and in-vitro research use only, and does not constitute evidence of clinical quality, therapeutic equivalence or suitability for human administration [4].
Measurement Limits and Error Checks
Click calculations for research pens carry inherent quantitative limits that must be characterised before any experimental protocol is designed. Each audible click corresponds to a nominal mechanical increment, typically 0.01 mL on a 3 mL / 300-click cartridge, but partial clicks cannot be delivered, so rounding to the nearest whole click will slightly over- or under-deliver the target mass compared with the calculated figure [2]. StackCalc’s 2025–2026 pen dosing guide frames per-click values as nominal rather than guaranteed exact microgram quantities, and recommends that laboratories document their rounding convention explicitly so that accumulated error across multiple measurements remains within defined experimental limits [2].
Unit mismatches introduce a separate class of error. A specification expressed in milligrams must not be applied directly to a calculator parameterised in micrograms without explicit conversion; a 133 µg per click value and a 0.133 mg per click value are arithmetically identical, but entering the wrong figure into a tool without unit-checking produces a tenfold error [2][3]. ResearchPeptideCalculator (2026) addresses this by requiring users to confirm the unit of the labelled mass before the tool returns a per-click figure [3].
Values must never be transferred from one product to another without independent verification. A per-click mass derived from a 40 mg Tirzepatide pen cannot be assumed to apply to any other compound or pen format, even where the cartridge volume appears identical; total labelled mass, solution volume and mechanical scale must each be confirmed from the batch record for the specific SKU in use [2][4]. Where any of these values is unavailable or inconsistent across label, pen card and batch record, resolve the discrepancy before laboratory work proceeds rather than estimating from a comparable product.
As a cross-check, multiply the per-click mass by the total click count and confirm the result recovers the labelled total mass; any discrepancy beyond rounding indicates a specification error requiring investigation [2]. For handling conditions that affect solution integrity and therefore the validity of concentration assumptions, storage and stability guidance provides the relevant reference.
Research-Use-Only Limitations
All pen specifications, click calculations and unit-conversion references on this page are for laboratory and in-vitro research use only, and do not constitute dosing guidance, administration instructions, titration schemes or treatment protocols for humans or animals. A click-count figure describes a nominal mechanical increment of a research device and does not authorise, recommend or imply any human-use outcome.
ResearchPeptideCalculator (2026) states explicitly that its tools are “a calculation tool only, not dosing guidance” and that all materials are “for research and laboratory use only” [3]. StackCalc’s 2026 pen-dosing guide frames every per-click value as a device-format parameter, not a dose recommendation, and makes clear that specification tables do not instruct readers to dial, inject, split or administer material [2].
Researchers requiring compound-specific mechanism and evidence context, outside the scope of device arithmetic, can consult the retatrutide research profile for background that this page deliberately excludes. To apply these specification principles to other compounds, browse Veyvora’s research peptide catalogue and confirm total mass, solution volume and mechanical click count from the batch documentation for each specific SKU before beginning any laboratory calculation.
Sources
[1] Veyvora, research peptides, measured to the microgram, veyvora.com, https://veyvora.com/ [2] Pen Dosing Guide, The 3 mL / 300-Click Format Explained – StackCalc, stackcalc.co.uk, https://stackcalc.co.uk/guides/pen-dosing/ [3] Retatrutide 40mg Pen Click Calculator | Peptide Pen Dose Tool | ResearchPeptideCalculator.co.uk, researchpeptidecalculator.co.uk, https://researchpeptidecalculator.co.uk/tools/pen-calculator [4] Label Reconciliation and Accountability Ch [FREE] | POPProbe, ecfr.gov, https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-111/subpart-I
