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.
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 the pen’s total divided by 300. The converter on this page works that out for every pen and runs the conversion both ways: 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 confirms a pen’s labelled units and batch documents before recording a click-derived value in a research protocol. It covers how the per-click amount is calculated, which records are present and internally consistent before you record that value, and which unit controls prevent transcription errors. This is unit-conversion maths for the laboratory record. 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 applies 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 is arithmetic on the label; delivered or assayed quantity is reported by the batch records.
- Where any required record is missing, ambiguous or inconsistent, record the value as unknown, verification required and obtain the record from the supplier.
What This Reference Covers
A pen click is a mechanical increment defined by a specific device. The click count, reservoir volume and labelled content are separate attributes, each read from its own record. Each device has its own geometry, even where two appear 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 are answered by the appropriate batch documents, analytical methods and laboratory procedures.
A per-click figure belongs to its own pen, strength, compound and 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 what a chromatographic purity result reports; the pen conversion and delivered quantity come from the device specification and batch record.
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 is converted to mass only with an authoritative conversion for that exact substance and reference standard. IU definitions vary by substance and reference preparation, so the conversion is substance-specific.
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.
- Take values from the product’s own records rather than 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. It is a unit-conversion reference for laboratory use.
Batch Evidence and the Calculation
A label-derived calculation describes nominal arithmetic. The material inside the device is characterised by the CoA, which reports analytical identity and purity; the weight of each result depends on the method, sample and traceability to the physical lot.
Describe a nominal label value as “delivered”, “verified” or “assayed” where an appropriate batch record supports that claim; that traceable analytical record is lot-specific, unlike a general supplier statement.
Where the label, device specification or CoA is missing, ambiguous or inconsistent, record the value as unknown, verification required and obtain the record from the supplier.
Research Use
Veyvora’s root-market pen pages are product records for research materials supplied for in-vitro laboratory use. Not for human or veterinary use. The BPC-157 + TB-500 research pen and the Tesamorelin research pen are each checked against their own current label and batch documentation, because each pen carries its own device geometry, labelled content and lot-specific CoA.
Documentation Outcome
A completed laboratory check produces 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 yet be completed from exact same-product evidence, the calculation waits for that evidence.
To begin the reconciliation process, use Veyvora’s batch-verification tool before entering any click-derived value into an experimental record.
