Clicks to micrograms
Every Veyvora pen is a pre-filled 3 mL barrel that delivers 300 clicks, so the amount per click is simply the pen's total divided by 300. Use this to convert clicks to micrograms and back. It's unit-conversion maths for laboratory handling only — not dosing, medical, or usage guidance.
the formula
For a milligram pen: amount per click (µg) = pen total (mg) × 1000 ÷ 300.
A 40 mg pen therefore delivers about 133 µg per click (40 × 1000 ÷ 300).
Somatropin is filled in IU, so it reports IU ÷ 300 per click instead.
More on the format in the click pen, and on keeping a pen stable in storage & stability.
Clicks are whole increments; the pen can't deliver a partial click, so click results are rounded to the nearest whole click.
Per-click reference, every pen
| Pen | Pen total | Per click (÷300) |
|---|---|---|
| BPC-157 + TB-500 40 | 40 mg | 133.33 µg |
| CJC-1295 + Ipamorelin 20 | 20 mg | 66.67 µg |
| GHK-Cu 100 | 100 mg | 333.33 µg |
| GLOW 70 | 70 mg | 233.33 µg |
| KLOW 80 | 80 mg | 266.67 µg |
| Melanotan II 20 | 20 mg | 66.67 µg |
| MOTS-C + SS-31 40 | 40 mg | 133.33 µg |
| NAD+ 1000 | 1000 mg | 3,333.33 µg |
| PT-141 20 | 20 mg | 66.67 µg |
| Retatrutide 20 | 20 mg | 66.67 µg |
| Retatrutide 40 | 40 mg | 133.33 µg |
| Somatropin 100 | 100 IU | 0.33 IU |
| Tesamorelin 20 | 20 mg | 66.67 µg |
| Tirzepatide 40 | 40 mg | 133.33 µg |
Figures are exact conversions of each pen's labelled total across 300 clicks. Every pen ships with a batch-specific certificate of analysis confirming the labelled amount.
Research Pen Click Calculator: Laboratory Documentation Check
Overview
Last reviewed: June 2026
Every Veyvora pen is a pre-filled 3 mL barrel that delivers 300 clicks, so the amount per click is simply the pen’s total divided by 300. The converter on this page works that out for every pen and runs the conversion in both directions — a target amount to a whole number of clicks, and a number of clicks back to an amount. This page also explains how a laboratory should confirm a pen’s labelled units and batch documents before recording a click-derived value in a research protocol. By the end of this reference, a researcher will know: (1) how the per-click amount is calculated; (2) which records must be present and internally consistent before recording a click-derived value; and (3) which unit controls prevent transcription errors. This is unit-conversion maths only: it does not recommend a target dose, a number of clicks to administer, or convert a desired mass into an administration setting. A click value applies to your material only when the physical pen, product label, device specification and batch-specific certificate of analysis (CoA, a document confirming the composition and purity of a specific production lot) all refer to the same product and lot; where those records disagree, resolve the discrepancy before relying on the figure.
Key Takeaways
- A click value is valid only when the physical pen, label, device specification and CoA share the same product and lot identifier.
- Milligrams, micrograms and international units (IU) are not interchangeable; each requires its own authoritative basis before conversion.
- A nominal label calculation does not measure the material inside the device, only appropriate batch records can support claims of delivered or assayed quantity.
- Where any required record is missing, ambiguous or inconsistent, record the value as unknown, verification required and do not substitute a figure from another source.
What This Reference Can and Cannot Establish
A pen click is a mechanical increment defined by a specific device. The click count, reservoir volume and labelled content are separate attributes, and none can be inferred safely from another. The geometry of one device does not transfer to another, even one that appears identical.
This reference helps a researcher check whether the required records are present and internally consistent. Delivered mass, analytical purity, identity, sterility, biological activity and suitability for a particular experiment lie outside its scope; those questions require the appropriate batch documents, analytical methods and laboratory procedures.
Do not transfer a per-click figure from another pen, strength, compound, market page or device.
Verify the Physical Pen Against Its Documents
Before recording a click-derived value in a laboratory worksheet:
- Record the canonical product name exactly as printed on the pen and carton.
- Record the lot or batch identifier from the physical pen.
- Match that identifier to the batch-specific CoA.
- Confirm that the device specification explicitly states the total click count and reservoir volume.
- Confirm that the label and CoA use the same quantity and unit.
- Record the source document, revision or access date and the operator who completed the check.
Use Veyvora’s batch-verification process to reconcile the physical identifier with the CoA. The separate guide to HPLC purity explains why a chromatographic purity result does not validate a pen conversion or confirm delivered quantity.
Unit and Rounding Controls
Keep the source unit unchanged until the final documented conversion step. Milligrams, micrograms and international units (IU) are not interchangeable. A value expressed in IU requires a product-specific basis and must not be converted to mass without an authoritative conversion for that exact substance and reference standard. IU definitions vary by substance and reference preparation, so a generic factor would introduce unquantifiable error.
Use SI (International System of Units) symbols consistently and retain enough decimal places to show the unrounded result. The UK National Physical Laboratory’s SI units guidance is an appropriate reference for unit symbols. Apply the laboratory’s approved rounding rule only after the calculation has been independently checked.
The following controls prevent common transcription errors:
- Retain the labelled total, click count and unit as separate fields.
- Record the formula rather than only the result.
- Flag any unit mismatch before calculation.
- Prohibit copied values from sibling products or other markets.
- Require a second-person check for any value used in an experimental record.
- Preserve the unrounded result alongside the stated rounding method.
This page does provide the per-click reference table for every pen and both conversion directions — target amount to clicks, and clicks to amount — all built on the same arithmetic: pen total (mg) × 1000 ÷ 300. What it deliberately leaves out is dosing: schedules, injection volumes and administration examples. Those formats would turn a neutral unit conversion into actionable human-use guidance, which falls outside the research-only scope of this reference.
Batch Evidence and Calculation Limits
A label-derived calculation describes nominal arithmetic. It does not measure the material inside the device. A CoA may report analytical identity or purity, but the weight of each result depends on the method, sample and traceability to the physical lot.
Do not describe a nominal label value as “delivered”, “verified” or “assayed” unless an appropriate batch record explicitly supports that claim. A general supplier statement is not lot-specific and cannot substitute for a traceable analytical record.
Where the label, device specification or CoA is missing, ambiguous or inconsistent, record the value as unknown, verification required. Do not fill the gap with a figure from another Veyvora page, a country-specific catalogue, a third-party calculator or a similar pen.
Research-Use-Only Boundary
Veyvora’s root-market pen pages are commercial product records for research materials, not instructions for treatment or administration. The BPC-157 + TB-500 research pen and the Tesamorelin research pen must each be checked against their own current label and batch documentation. Neither page substitutes for the other, because each pen carries its own device geometry, labelled content and lot-specific CoA.
This reference provides no human dose, injection volume, titration sequence, weekly schedule, target-mass lookup or syringe workaround. It must not be used to prescribe, administer or substitute for a licensed medicine.
Documentation Outcome
A completed laboratory check should produce a traceable record containing the product name, batch identifier, source documents, source units, approved formula, unrounded result, rounding rule, verifier and date. Where the record cannot be completed from exact same-product evidence, the calculation remains blocked.
To begin the reconciliation process, use Veyvora’s batch-verification tool before entering any click-derived value into an experimental record.
