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, for a laboratory protocol. All materials, specifications and calculations described here are for laboratory and in-vitro research use.
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 derived from the label.
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]. Reconcile the figures on those cards against the batch certificate of analysis (CoA) before use, so that mechanical scale and nominal content agree with the released batch record [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 in a research protocol.
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.
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, verify a batch against its CoA to confirm that the released batch record agrees with the nominal specification; where batch testing alters nominal content, the batch record is the figure to use [3]. For a fuller account of what the purity figure reports, how HPLC purity should be interpreted provides the relevant analytical context.
Verified Pen or Product Specifications
Verified pen specifications are drawn from the product label, structured product data or a released batch record. 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). Confirm figures against the current label and batch record before use; where batch testing alters nominal content, the batch record carries the figure to use.
The 3 mL / 300-click format is consistent with ISO-style research cartridges, where each click corresponds to a nominal 0.01 mL [2]. For a pen on a different mechanical scale, confirm its click volume from its label before applying the per-click mass formula.
For compounds not listed above, the per-click value comes 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.
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 a reminder to verify outputs against the actual pen label, because mechanical scales vary between devices [3].
Record all derived values 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 can take per-click values from the relevant product label or batch record before applying these ratios; the retatrutide research profile provides compound-specific mechanism and evidence context.
All conversions described here are dimensional arithmetic for laboratory and in-vitro research.
Label and Batch-Document Reconciliation
Click calculations are as reliable as the specification values they draw from, so trace every derived figure to the released batch record and packaging documentation for that specific SKU (stock-keeping unit). Where a pen card, a web specification and the internal batch record differ, the batch record takes precedence; resolve the difference before laboratory work proceeds [4].
Reconciliation for a research pen confirms 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 means updating any calculator parameterised from the previous specification; batch-level confirmation of the 3 mL / 300-click scale keeps the arithmetic exact [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. 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, how HPLC purity should be interpreted provides the relevant analytical context for reading the percentage figure.
Reconciliation is a documentation and quality-assurance activity for laboratory and in-vitro research [4].
Measurement Limits and Error Checks
Click calculations for research pens carry quantitative limits worth characterising before an 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. Convert explicitly before applying a specification expressed in milligrams to a calculator parameterised in micrograms; a 133 µg per click value and a 0.133 mg per click value are arithmetically identical, and unit-checking before entry keeps a tenfold error out of the result [2][3]. ResearchPeptideCalculator (2026) addresses this by asking users to confirm the unit of the labelled mass before the tool returns a per-click figure [3].
Each product’s values stand on their own. A per-click mass derived from a 40 mg Tirzepatide pen applies to that pen; for any other compound or pen format, even where the cartridge volume is the same, confirm total labelled mass, solution volume and mechanical scale from the batch record for the specific SKU in use [2][4]. Where any of these values differs across label, pen card and batch record, resolve the difference before laboratory work proceeds.
As a cross-check, multiply the per-click mass by the total click count and confirm the result recovers the labelled total mass; a difference beyond rounding points to a specification value worth re-checking [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
All pen specifications, click calculations and unit-conversion references on this page are for laboratory and in-vitro research: preparing working solutions for receptor-binding and signalling assays, cell-culture work and analytical reference material. A click-count figure describes a nominal mechanical increment of a research device. Not for human or veterinary use.
ResearchPeptideCalculator (2026) describes its tools as “a calculation tool only” for materials “for research and laboratory use only” [3], and StackCalc’s 2026 pen-dosing guide frames every per-click value as a device-format parameter [2].
Researchers wanting compound-specific mechanism and evidence context, beyond device arithmetic, can consult the retatrutide research profile. 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
