GHK-Cu 100
evenings · topical · 333 µg per click · 300 clicks per pen
1 mg · 3 clicks
Dispensed onto clean skin in the evening, the copper-blue tint is expected and absorbs in. The reference schedule starts low while the skin adjusts; brief tingling in the first nights is common, persistent redness is not.
2 mg · 6 clicks
The dose the remodelling literature is built on. Texture reads first, a smoother feel around week four, with tone and fine-line change closer to week six in the published photography protocols.
2 mg · 6 clicks
From week eight, alternate evenings maintain what daily use built. New collagen in the literature is protected by consistent SPF, the reference schedule pairs every morning with sun protection. One kit at maintenance pace lasts roughly twice as long.
Key Takeaways
- The Veyvora GHK-Cu 100 pen delivers 333 µg of GHK-Cu per click, derived arithmetically from three label values: 100 mg total content, 3 mL cartridge volume and 300 mechanical clicks.
- Confirm all concentration and per-click figures against the batch Certificate of Analysis (CoA) before use in an in-vitro protocol: label arithmetic gives the nominal values, and the CoA reports the lot’s measured purity.
- This page covers label-derived specifications, unit-conversion arithmetic and batch-reconciliation steps for laboratory and in-vitro research.
The Veyvora GHK-Cu 100 pen is specified as a 3 mL, 300-click multi-dose device delivering 333 µg per click, with a total stated peptide content of approximately 100 mg; at that per-click figure, 3 clicks give approximately 1 mg and 6 clicks give approximately 2 mg [1].
| Specification | Stated value |
|---|---|
| Total peptide content | ~100 mg |
| Cartridge volume | 3 mL |
| Total mechanical clicks | 300 |
| Per-click delivery | 333 µg |
| Implied concentration | 33.33 mg/mL |
| Per-click volume | 0.01 mL |
Source: Veyvora product specification, 2026 [1]
The 33.33 mg/mL concentration and 333 µg per-click figure are arithmetic derivations of the label values; the batch CoA reports the measured values for the lot. Confirm these figures against the batch CoA before use in an in-vitro protocol.
Technical Scope
This page is a label-derived specification and unit-conversion reference for the Veyvora GHK-Cu 100 multi-dose pen, for laboratory and in-vitro research. It records the device’s stated total peptide content, cartridge volume and per-click delivery, then shows the arithmetic connecting those figures so researchers can verify them against batch documentation before use in an in-vitro protocol.
The specification framework rests on three label values: 100 mg total GHK-Cu (glycine-histidine-lysine copper complex), 3 mL cartridge volume and 300 mechanical clicks [1]. Every derived figure on this page, including the 33.33 mg/mL implied concentration and the 333 µg per-click mass, follows arithmetically from those three values; confirm them against the batch CoA before experimental use. For guidance on matching a batch number to its CoA, see how to match a batch number to its CoA.
What a purity percentage reports is addressed separately in what HPLC (high-performance liquid chromatography) purity does and does not prove.
Verified Pen Specifications
The Veyvora GHK-Cu 100 pen is specified as a 3 mL, 300-click multi-dose device containing 100 mg of GHK-Cu, with each mechanical click delivering 333 µg; these are label-derived values for laboratory and in-vitro research [1].
| Specification | Label value | Source |
|---|---|---|
| Total GHK-Cu content | 100 mg | Veyvora product specification, 2026 |
| Cartridge volume | 3 mL | Veyvora product specification, 2026 |
| Total mechanical clicks | 300 | Veyvora product specification, 2026 |
| Implied concentration | 33.33 mg/mL | Arithmetic: 100 mg ÷ 3 mL [1] |
| Per-click volume | 0.01 mL | Arithmetic: 3 mL ÷ 300 [1] |
| Per-click mass | 333 µg (≈ 0.333 mg) | Arithmetic: 33.33 mg/mL × 0.01 mL [1] |
The 33.33 mg/mL concentration and 333 µg per-click mass are arithmetic consequences of the three label values; the batch CoA carries the measured figures to confirm them against before use in an experimental protocol. In the 3 mL / 300-click format, mg per click equals total mg divided by 300, so a 100 mg pen in this format delivers 0.333 mg per click [1].
Batch-level values, including HPLC purity, copper stoichiometry and endotoxin status, are reported on the batch CoA rather than the product page; read them from the CoA before experimental use. For cold-chain receipt and storage requirements, see research-peptide storage at 2–8 °C. The full range of Veyvora research peptides is listed in Veyvora’s research-peptide catalogue.
Unit-Conversion Method
Three arithmetic steps convert the GHK-Cu 100 pen’s label values into the concentration and per-click mass figures used to prepare in-vitro solutions: divide total mass by total volume to obtain concentration, divide total volume by total clicks to obtain per-click volume, then multiply those two results to obtain per-click mass.
Step-by-Step Dimensional Arithmetic
Step 1, Concentration (mg/mL)
100 mg ÷ 3 mL = 33.33 mg/mL [1]
Step 2, Per-click volume (mL)
3 mL ÷ 300 clicks = 0.01 mL per click [1]
Step 3, Per-click mass (mg and µg)
33.33 mg/mL × 0.01 mL = 0.333 mg (333 µg) per click [1]
These three steps reproduce the 333 µg per-click figure stated on the Veyvora label from first principles. The formula mg per click = pen total mg ÷ 300 applies to the 3 mL / 300-click architecture, so a 100 mg pen in this format yields 0.333 mg per click [1].
Scaling Clicks to Mass for In-Vitro Preparation
For laboratory solution preparation, the same relationship runs in reverse: multiply the number of clicks by 0.333 mg to obtain the dispensed mass, or divide a target mass (in mg) by 0.333 to obtain the required click count. Both are dimensional conversions for preparing working solutions.
| Clicks | Volume (mL) | Mass (mg) | Mass (µg) |
|---|---|---|---|
| 1 | 0.01 | 0.333 | 333 |
| 3 | 0.03 | 1.000 | 1,000 |
| 6 | 0.06 | 2.000 | 2,000 |
| 10 | 0.10 | 3.333 | 3,333 |
All values are arithmetic conversions of Veyvora label data (2026); the batch CoA reports the measured figures.
Molar Conversion (Requires CoA Confirmation)
Researchers needing molar units divide the concentration in mg/mL by the molar mass of GHK-Cu. A reported molecular weight of 403.93 g/mol appears on the batch certificate of analysis [2], giving an approximate molarity of 33.33 mg/mL ÷ 403.93 g/mol ≈ 82.5 µmol/mL. This figure is a derived laboratory calculation rather than a label value; cross-check it against the batch CoA before use. For the distinction between purity percentage and identity confirmation, consult Veyvora’s analytical explainer on what HPLC purity does and does not prove.
Label and Batch-Document Reconciliation
Reconciliation confirms that the label values driving a calculation, 100 mg total content, 3 mL volume, 300 clicks and 333 µg per click, correspond to the specific batch loaded into the pen being used. This step ties an arithmetically correct calculation to the batch whose measured purity and copper stoichiometry the CoA reports, so that any in-vitro preparation that follows works from the lot’s own figures.
What to Check Against the Certificate of Analysis
A standard GHK-Cu analytical panel covers RP-HPLC (reversed-phase high-performance liquid chromatography) purity, MS/MS (tandem mass spectrometry) sequence confirmation and ICP-MS (inductively coupled plasma mass spectrometry) copper quantitation [2]. Before using the pen in an in-vitro preparation, confirm four points against the batch CoA:
- The stated total GHK-Cu mass (nominally 100 mg) read together with the CoA’s reported purity; the effective active mass is the label figure scaled by the measured purity against the ≥ 98.0% specification.
- The copper:peptide molar ratio aligns with the reference data for GHK-Cu (molecular weight 403.93 g/mol, as reported on the batch certificate of analysis [2]).
- The per-click volume assumption of 0.01 mL is mechanically consistent with the 3 mL / 300-click architecture confirmed on the batch record [1].
- Endotoxin screening results are present where the material will contact cell cultures.
Batch-specific CoA values are supplied with the batch rather than published on the product page; request the documentation from Veyvora and note any field still to be confirmed before use. For storage conditions that affect batch integrity between receipt and first use, see research-peptide storage at 2–8 °C. Further product context is available via Veyvora’s research-peptide catalogue.
Measurement Limits and Error Checks
The principal measurement limit of the GHK-Cu 100 pen is its fixed mechanical resolution: each click dispenses 0.01 mL, so the smallest adjustable increment across the 3 mL / 300-click cartridge is one click, equivalent to 333 µg of GHK-Cu [1]. A fraction of a click cannot be dispensed; a target mass that does not divide cleanly into multiples of 333 µg is approximated to the nearest whole click, giving a rounding ceiling of ±333 µg per operation. Where finer resolution is required, drawing solution into a calibrated syringe after dispensing is the standard approach [1].
Rounding and Unit Mismatches
The concentration figure of 33.33 mg/mL is a rounded quotient of 100 ÷ 3; the exact value is a repeating decimal (33.333… mg/mL). Carrying only two decimal places into a secondary calculation compounds rounding error across multiple steps, so retain at least four significant figures internally and round only at the final reporting stage.
Unit mismatches present a separate risk. The label states 333 µg per click; converting to mg (0.333 mg) and then back to µg without tracking the factor-of-1,000 step is a documented source of ten-fold errors in in-vitro preparation, because the magnitude difference between µg and mg is easily lost when values are transcribed without explicit units. Carry the unit explicitly on every intermediate value.
When Not to Transfer a Value from Another Product
A per-click figure derived from a different peptide pen, for example, one loaded with BPC-157, TB-500 or another research compound, belongs to that pen, even where the cartridge format appears identical. The 0.01 mL per-click volume is architecture-specific; a pen with the same 3 mL cartridge but a different total peptide load produces a different mg-per-click value [1]. Any deviation between the theoretical 0.01 mL per click and the volume actually dispensed, caused by device wear or manufacturing tolerance, is identified by calibration against the label figure.
Before relying on any batch in an in-vitro preparation, read the CoA purity alongside the nominal 100 mg figure; see what HPLC purity does and does not prove for what a purity percentage reports. For the practical step of matching a batch number to its documentation, refer to how to match a batch number to its CoA.
Research Use
All materials, specifications, arithmetic and analytical discussion on this page are for laboratory and in-vitro research: preparing working solutions for cell-culture, receptor-binding and analytical reference work. The Veyvora GHK-Cu 100 pen is a research reference device, and every per-click figure, concentration value and batch-reconciliation step is a tool for standardising in-vitro preparations. Not for human or veterinary use.
Terms such as “dose”, “protocol” or “per week” in this reference describe mechanical output and arithmetic relationships within a 3 mL / 300-click device [1]. Before first use of any batch, confirm that the CoA is current and that storage conditions have been maintained throughout transit; for cold-chain requirements, consult Veyvora’s guidance on research-peptide storage at 2–8 °C.
To review the full range of documented research peptides available from this supplier, visit Veyvora’s research-peptide catalogue.
Sources
[1] GHK-Cu 100 product specification, Veyvora, https://veyvora.com/peptides/ghk-cu-100 [2] GHK-Cu 100 certificate of analysis (Asterion Analytics), Veyvora, https://veyvora.com/testing/verify-your-batch
