Research & Reconstitution Library

GHK-Cu BAC Water & Reconstitution Guide: Concentration Calculator

GHK-Cu, also known as copper tripeptide-1 or copper peptide, is a copper complex of the naturally occurring tripeptide glycyl-histidyl-lysine (GHK). Research has investigated GHK-Cu primarily in topical skin, tissue-remodeling, wound-healing, and cellular models, but human clinical evidence remains limited and formulation- and route-specific.

Research-use clarification: This page explains scientific evidence and concentration mathematics. It does not provide a medical dose, recommend injectable use, or establish a clinically appropriate reconstitution volume for GHK-Cu.

Compound

GHK-Cu

Compound class

Copper tripeptide / metallopeptide

Research category

Tissue remodeling & skin research

Regulatory status

Not an FDA-approved injectable drug

Human evidence

Limited / formulation-specific

Standardized vial size

No universal research vial size established

How Much BAC Water for GHK-Cu?

There is no single universal BAC-water volume that is scientifically established for GHK-Cu. The amount of liquid determines the resulting concentration: increasing the liquid volume lowers the concentration, while decreasing the volume increases it.

For a research calculation, use:

Concentration (mg/mL) = Total GHK-Cu (mg) ÷ Liquid Volume (mL)

The examples below are mathematical concentration examples. They should not be interpreted as instructions for human administration or as a recommended GHK-Cu formulation.

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Use the BacScience Universal BAC Water Calculator to enter your own compound quantity and liquid volume.

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GHK-Cu Concentration Examples

Because there is no universal GHK-Cu research vial size, the quantities below are presented as illustrative mathematical examples. Always distinguish the quantity printed on the actual material or study formulation from these examples.

GHK-Cu quantity	1 mL liquid	2 mL liquid	2.5 mL liquid	3 mL liquid	5 mL liquid
10 mg	10 mg/mL	5 mg/mL	4 mg/mL	3.33 mg/mL	2 mg/mL
50 mg	50 mg/mL	25 mg/mL	20 mg/mL	16.67 mg/mL	10 mg/mL
100 mg	100 mg/mL	50 mg/mL	40 mg/mL	33.33 mg/mL	20 mg/mL

Mathematical examples only. These values do not establish that any particular vial size or concentration is clinically appropriate.

GHK-Cu Molecular & Research Context

GHK-Cu is studied as a copper-containing tripeptide complex. Its biological research includes copper coordination, extracellular matrix remodeling, fibroblast activity, skin biology, and wound repair models.

Public-domain chemical structure illustration of GHK copper complex — GHK-Cu structural illustration.

BacScience educational illustration showing the mathematical relationship between fixed compound quantity, liquid volume, and resulting concentration.

How Much BAC Water Should Be Added to GHK-Cu?

There is no scientifically established universal amount of bacteriostatic water that should be added to GHK-Cu. The appropriate liquid volume depends on the intended research formulation, material specifications, solubility, stability requirements, concentration target, route-specific formulation, and validated study protocol.

For that reason, BacScience does not assign a single "correct" BAC-water volume to GHK-Cu. Instead, concentration can be calculated mathematically from the amount of compound and the selected liquid volume.

How much BAC water for GHK-Cu 10 mg?

If 10 mg is being used as a purely mathematical example, 1 mL produces 10 mg/mL, 2 mL produces 5 mg/mL, 2.5 mL produces 4 mg/mL, 3 mL produces approximately 3.33 mg/mL, and 5 mL produces 2 mg/mL.

How much BAC water for GHK-Cu 50 mg?

As a mathematical example, 50 mg divided by 1 mL equals 50 mg/mL. The same 50 mg divided by 2 mL equals 25 mg/mL, while 2.5 mL gives 20 mg/mL, 3 mL gives approximately 16.67 mg/mL, and 5 mL gives 10 mg/mL.

How does BAC-water volume change GHK-Cu concentration?

Increasing the liquid volume increases the total solution volume and therefore lowers the concentration. Decreasing the liquid volume produces a higher calculated concentration, assuming the total amount of compound remains constant.

What Is GHK-Cu?

GHK-Cu is a copper-containing complex associated with glycyl-L-histidyl-L-lysine (GHK), a naturally occurring tripeptide. GHK has a strong affinity for copper ions and can form copper-bound complexes commonly referred to as GHK-Cu or copper tripeptide-1.

PubChem records multiple chemical representations of GHK-Cu, including copper tripeptide structures and prezatide copper. This is important when comparing research materials because chemical identity, salt form, formulation, purity, and actual copper-peptide speciation can affect how a material should be characterized. :contentReference[oaicite:2]{index=2}

Entity definition: GHK-Cu should be treated as a copper-peptide complex rather than simply as "GHK plus water." Its chemical form and formulation should be verified from the material's analytical documentation.

How GHK-Cu Works

Research on GHK-Cu has focused on its interactions with copper and biological pathways involved in extracellular-matrix remodeling, inflammation, fibroblast biology, angiogenesis, and wound repair.

Laboratory studies have reported effects on matrix-related proteins and metalloproteinase pathways. For example, an in-vitro fibroblast study found that GHK-Cu increased MMP-2 levels and altered secretion of tissue inhibitors of metalloproteinases. These findings are mechanistic and should not be interpreted as proof of a clinical treatment effect. :contentReference[oaicite:3]{index=3}

Reviews of the literature similarly describe substantial preclinical interest in skin remodeling, wound healing, inflammatory signaling, and extracellular-matrix biology while emphasizing the limited number and variability of clinical studies. :contentReference[oaicite:4]{index=4}

What Is GHK-Cu Being Studied For?

Skin Biology

Human and laboratory research has examined GHK-Cu in relation to skin structure, wrinkles, elasticity, collagen-related processes, and photodamage.

Wound Repair

Animal and cellular models have investigated extracellular matrix accumulation, collagen synthesis, and wound-healing processes.

Cellular Research

In-vitro research has investigated fibroblasts, keratinocytes, metalloproteinases, inflammatory pathways, and growth-factor signaling.

Regenerative Research

Preclinical literature continues to investigate whether GHK-Cu-mediated tissue remodeling can translate into useful regenerative applications.

Topical Formulation Research

Human studies have predominantly involved topical formulations, making topical formulation evidence different from injectable research.

Current Clinical Investigation

A registered Phase 2 study is evaluating topical GHK-Cu gel in standardized acute skin wounds. Results have not been posted in the registry record.

Human Clinical Research

Human evidence for GHK-Cu is limited and strongly dependent on formulation and route. A 2006 randomized study involving patients after CO₂ laser resurfacing found no statistically significant objective improvement in erythema resolution, wrinkles, or overall skin quality, although patient satisfaction differed between groups. Only 13 patients completed the study. :contentReference[oaicite:5]{index=5}

More recent reviews describe a small clinical evidence base with methodological variability. A 2026 systematic review identified 20 eligible studies, including 18 preclinical studies and 2 randomized controlled trials, while emphasizing the need for larger and better-standardized clinical studies. :contentReference[oaicite:6]{index=6}

Human evidence interpretation: Results from topical GHK-Cu formulations cannot automatically be extrapolated to injectable, subcutaneous, intramuscular, or other routes of administration.

Current registered clinical research

ClinicalTrials.gov currently lists NCT07437586, a Phase 2, randomized, double-blind, vehicle-controlled study of topical GHK-Cu gel in standardized acute skin wounds. The registry describes a 0.1% w/w topical gel used once daily for 14 days. This is a trial-specific topical formulation, not an injectable BAC-water reconstitution protocol. The study is recruiting and has no posted results in the registry record. :contentReference[oaicite:7]{index=7}

Doses Studied in Published Research

Published GHK-Cu research contains different formulations, concentrations, routes, and experimental models. These values should be treated as descriptions of individual studies rather than as BacScience dosing recommendations.

Study / evidence	Population / model	Research formulation or concentration	Route	Duration / design	Interpretation
Miller et al., 2006	13 patients after CO₂ laser resurfacing	Copper-tripeptide skin-care regimen; exact active concentration not used here as a generalized recommendation	Topical	Post-treatment follow-up	No significant objective difference in erythema, wrinkles, or overall skin quality.
GHK-Cu fibroblast studies	Human dermal fibroblast cultures	Experimental nanomolar concentrations in cell culture	In vitro	Laboratory experiment	Mechanistic evidence only; not a human dose.
Maquart et al.	Rat wound model	Multiple experimental GHK-Cu concentrations	Animal model	Experimental wound model	Concentration-dependent extracellular-matrix effects were reported.
NCT07437586	Healthy adults with standardized acute skin wounds	0.1% w/w GHK-Cu gel	Topical	Once daily for 14 days; Phase 2	Ongoing registered clinical research; no results posted.

Research-study parameters are not BacScience recommendations, prescriptions, or instructions for self-administration.

Preclinical Research

GHK-Cu has a substantial preclinical literature. In cell and animal models, researchers have investigated extracellular-matrix accumulation, collagen-related activity, fibroblast behavior, inflammatory signaling, and tissue remodeling.

In a rat wound model, GHK-Cu administration was associated with concentration-dependent increases in dry weight, DNA, total protein, collagen, and glycosaminoglycan content within wound chambers. The investigators also reported increases in type I and type III collagen mRNA. :contentReference[oaicite:8]{index=8}

These results are useful for understanding biological mechanisms, but animal and cell-culture findings do not establish an effective or safe human dose.

Evidence boundary: In-vitro → preclinical → human clinical evidence are separate evidence levels. A concentration that produces an effect in a cell culture or animal model cannot be converted directly into a human treatment dose.

Research Reconstitution & Concentration

From a mathematical standpoint, the concentration calculation is straightforward. Divide the total amount of compound by the volume of liquid used.

Core equation

mg/mL = mg ÷ mL

Example:

50 mg ÷ 2 mL = 25 mg/mL

The mathematical concentration changes when the liquid volume changes. The original amount of compound does not magically increase or decrease merely because more liquid is present.

Worked examples

10 mg ÷ 1 mL = 10 mg/mL
10 mg ÷ 2.5 mL = 4 mg/mL
50 mg ÷ 2 mL = 25 mg/mL
50 mg ÷ 5 mL = 10 mg/mL
100 mg ÷ 3 mL = 33.33 mg/mL

These calculations describe concentration only. They do not establish whether a concentration is stable, sterile, suitable for a particular route, or clinically appropriate.

BAC Water vs. GHK-Cu Concentration

BAC water is a diluent concept; concentration is a mathematical relationship between compound quantity and total liquid volume. They should not be treated as interchangeable concepts.

More liquid

Holding compound quantity constant, increasing the liquid volume lowers the calculated mg/mL concentration.

Less liquid

Holding compound quantity constant, reducing the liquid volume raises the calculated mg/mL concentration.

Same compound quantity

Changing liquid volume does not change the total amount of compound originally present in the vial.

Important formulation distinction: A mathematical concentration does not establish compatibility, solubility, stability, sterility, pH suitability, osmolality, preservative suitability, or clinical appropriateness. Those questions require formulation-specific scientific validation.

Research Limitations & Safety

GHK-Cu should not be presented as an FDA-approved injectable medicine. FDA's current compounding information identifies GHK-Cu for injectable routes among substances that may present significant safety concerns, citing potential immunogenicity associated with aggregation and peptide-related impurities and limited human safety data. :contentReference[oaicite:9]{index=9}

FDA's 2026 bulk-substance update also distinguishes GHK-Cu by route, noting regulatory evaluation of non-injectable GHK-Cu separately from injectable routes. This should not be interpreted as FDA approval of GHK-Cu as a therapeutic drug. :contentReference[oaicite:10]{index=10}

No clinically established human injectable dose has been identified.

Human topical research and preclinical studies should not be converted into an injectable dosing protocol.

Why reconstitution requires more than arithmetic

A concentration calculation does not verify whether a particular material can safely be reconstituted with a particular diluent. Researchers must consider identity, purity, formulation, pH, compatibility, stability, sterility, storage requirements, container interactions, and the validated protocol for the specific material.

Frequently Asked Questions About GHK-Cu BAC Water

How much BAC water should I add to GHK-Cu?

There is no universal scientifically established BAC-water volume for GHK-Cu. Different liquid volumes create different mathematical concentrations. A specific formulation should follow the validated instructions for the material or research protocol rather than a generic online recommendation.

What is the GHK-Cu reconstitution formula?

For concentration mathematics, use: concentration = total compound quantity ÷ liquid volume. For example, 50 mg divided by 2 mL equals 25 mg/mL.

What concentration does 50 mg of GHK-Cu make with 2 mL?

Mathematically, 50 mg ÷ 2 mL = 25 mg/mL. This is a concentration calculation, not a clinical recommendation.

What concentration does 10 mg of GHK-Cu make with 2.5 mL?

Mathematically, 10 mg ÷ 2.5 mL = 4 mg/mL.

Does adding more BAC water reduce GHK-Cu concentration?

Yes. If the total compound quantity stays constant, increasing liquid volume decreases the calculated concentration in mg/mL.

Is there an FDA-approved injectable GHK-Cu product?

GHK-Cu is not an FDA-approved injectable drug. FDA has specifically identified injectable GHK-Cu in its compounding safety information because of concerns including potential immunogenicity and limited human safety data. :contentReference[oaicite:11]{index=11}

What has GHK-Cu been studied for in humans?

Human research has included topical skin and tissue-related applications. A small randomized study evaluated topical copper-tripeptide treatment following CO₂ laser resurfacing, while newer research continues to investigate topical formulations and wound healing. :contentReference[oaicite:12]{index=12}

Has GHK-Cu been studied in animals?

Yes. Animal research has investigated wound healing and extracellular-matrix effects, including collagen-related outcomes. These findings are preclinical and cannot be directly converted into human treatment recommendations. :contentReference[oaicite:13]{index=13}

Is a GHK-Cu research concentration the same as a clinical dose?

No. Concentration, dose, route, exposure, and formulation are different concepts. A concentration used in cell culture or a topical clinical formulation cannot automatically be converted into a human systemic dose.

Can the BacScience calculator calculate GHK-Cu concentration?

Yes. The Universal BAC Water Calculator can perform the concentration mathematics using a custom compound quantity and liquid volume.

Open the BAC Water Calculator →

Does BAC water determine whether GHK-Cu is stable?

No. The volume calculation only determines mathematical concentration. It does not establish chemical stability, sterility, compatibility, or shelf life.

Is there a clinically established human injectable dose for GHK-Cu?

No clinically established human injectable dose has been identified. Existing human evidence is primarily formulation- and route-specific topical research, while injectable use remains a separate and substantially less established question.

Explore the BacScience Research Library

Continue from GHK-Cu concentration mathematics into the broader BacScience research, testing, and reconstitution ecosystem.

Developer internal-link note: Add links here to verified GHK-Cu-related compound pages, relevant stack pages, COA/testing pages, batch traceability pages, and validated BAC-water research resources when those URLs exist. Do not publish placeholder URLs as live links.

Scientific References

The following sources were selected for chemical identity, regulatory context, clinical research, and preclinical evidence.

PubChem — Prezatide Copper / GHK-Cu
National Center for Biotechnology Information, PubChem CID 71587328.
FDA — Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks
FDA information regarding injectable GHK-Cu and potential immunogenicity concerns.
Miller TR et al. — Effects of topical copper tripeptide complex on CO₂ laser-resurfaced skin
Arch Facial Plast Surg. 2006;8(4):252-259. PMID: 16847171.
Pickart et al. / GHK-Cu research literature
Peer-reviewed literature examining GHK and GHK-Cu in tissue remodeling, wound repair, and aging-related biology.
Maquart FX et al. — In vivo stimulation of connective tissue accumulation by GHK-Cu in rat experimental wounds
Journal of Clinical Investigation. PMID: 8227353.
ClinicalTrials.gov — NCT07437586
Topical GHK-Cu Gel for Acute Skin Wound Healing. Phase 2 randomized controlled study.
2026 Systematic Review — The Regenerative Potential of GHK-Cu in Aesthetic Medicine
Review of clinical and preclinical GHK-Cu evidence.

Last scientifically reviewed: September 10, 2026
Scientific reviewer: BacScience Research Editorial Team
Review standard: Primary-source-first review using PubChem, FDA, PubMed, and ClinicalTrials.gov where applicable.
Important: Clinical-trial parameters describe individual research protocols and are not BacScience treatment recommendations.

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