Side-by-side · Research reference

GHK-CuvsTesamorelin

Side-by-side comparison across mechanism, dosage, evidence, side effects, administration, and stack synergies. Citations on every claim where available.

AHuman-MechanisticHUMAN-REVIEWED4/47 cited

BFDA-ApprovedFlagship26/68 cited

GHK-Cu

Tripeptide · Skin / Hair / Wound Healing

1–2 mgSQ dose

HumanMechanisticPickart 2018 Zink 2003

HoursHalf-life

SQ or topical · Local · Daily or 2-3×/week

Tesamorelin

GHRH Analogue · FDA-Approved

2 mgDaily doseEGRIFTA® (tesamorelin for inje 2010

15–20%VAT reductionFalutz 2010

~26 minHalf-lifeEGRIFTA® (tesamorelin for inje 2010

SQ · Abdomen · Once Daily

01Mechanism of Action

Parameter

GHK-Cu

Tesamorelin

Primary target

Copper-dependent enzymes (lysyl oxidase, SOD); regulator of >4000 human genesPickart 2018

Hypothalamic GHRH receptorsEGRIFTA® (tesamorelin for inje 2010

Pathway

Cu(II) delivery via GHK chelation → ↑collagen / elastin / GAG synthesis; ↓inflammatory cytokines; ↑hair follicle growth-factor signalingPickart 2018

GHRH → Pituitary GH release → Liver IGF-1 synthesisFalutz 2007

Downstream effect

Skin firmness + texture improvement, accelerated wound healing, hair regrowth, anti-inflammatory actionPickart 2018 Zink 2003

Increased GH pulsatility, elevated IGF-1, lipolysis of visceral adipose tissueFalutz 2010

Feedback intact?

Replaces declining endogenous levels

Yes — physiological pulsatility preserved

Origin

Endogenous tripeptide first isolated from human plasma; declines from ~200 ng/mL at age 20 to ~80 ng/mL at age 60

Synthetic 44-AA GHRH analogue with trans-3-hexenoic-acid modification for stabilityEGRIFTA® (tesamorelin for inje 2010

Antibody development

—

~50% after 26 wks (non-neutralising in most)Sévigny 2008

02Dosage Protocols

Parameter

GHK-Cu

Tesamorelin

Standard SQ dose

1–2 mg / day

Anecdotal injectable range; topical creams use 0.1–2% solutions.

—

Topical concentration

0.1–2.0% in serum / cream

—

Frequency

Daily or 2–3× per week (SQ)

Once daily (morning or pre-sleep)

Aligns with natural GH pulse.

Lower / starter dose

0.5 mg / day SQ

1 mg / day

1 mg still produces significant IGF-1 elevation.

Evidence basis

Human-mechanistic + topical clinical studies

RCT / FDA-approvedFalutz 2007 Falutz 2010

Duration

8–12 weeks for visible skin / hair effect

12–52 weeks

VAT returns within months of stopping.

Reconstitution

Bacteriostatic water; light-protected

Sterile water per labeling

Preserved at 2–8 °C after reconstitution.

Timing

No specific time; evening preferred for topicals

Empty stomach, pre-sleep preferred

Half-life

Hours (estimated; rapid tissue uptake)

~26 min (plasma)EGRIFTA® (tesamorelin for inje 2010

Modified vs native GHRH (7 min t½).

Standard dose

—

2 mg / dayEGRIFTA® (tesamorelin for inje 2010

FDA-approved protocol.

03Metabolic / Fat Loss Evidence

Parameter

GHK-Cu

Tesamorelin

Primary fat target

—

Visceral adipose tissue (VAT) — abdominal

Quantified reduction

—

15–20% VAT ↓Falutz 2010

By CT at 26 weeks (Falutz et al., NEJM).

IGF-1 impact

—

+66 ng/mL (2 mg dose) · +81% mean elevationFalutz 2007

Effect on lean mass

—

Modest lean mass preservation / slight increase

Insulin sensitivity

—

Neutral to slight impairment (monitor HbA1c)Stanley 2014

Triglycerides

—

Significant TG reduction noted in Phase 3Falutz 2010

Glucose metabolism

—

Generally neutral; 4.5% HbA1c elevation riskStanley 2014 EGRIFTA® (tesamorelin for inje 2010

Effect reversibility

—

VAT returns within months of stopping

Key publication

—

Falutz et al. NEJM 2007 · Falutz JCEM 2010 · FDA approval 2010

04Side Effects & Safety

Parameter

GHK-Cu

Tesamorelin

Injection site reaction

Erythema, mild pruritus (common)

Erythema, pruritus, redness (common)

Topical irritation

Mild redness, transient stinging

—

Copper accumulation

Theoretical with very high chronic doses

—

Allergic reaction

Rare hypersensitivity to copper

—

Pregnancy / OB

Avoid topical and SQ — insufficient data

ContraindicatedEGRIFTA® (tesamorelin for inje 2010

Wilson disease

Contraindicated

—

Fluid retention / Edema

—

Peripheral edema, arthralgia, carpal tunnel (GH-axis effect)

Glucose intolerance

—

HbA1c ↑ in 4.5% vs 1.3% placebo; HbA1c ≥6.5% hazard OR 3.3EGRIFTA® (tesamorelin for inje 2010

IGF-1 elevation

—

Dose-dependent; supraphysiological levels = discontinue

Cancer risk

—

Contraindicated in active malignancy (GH/IGF-1 axis); theoretical tumour growth riskEGRIFTA® (tesamorelin for inje 2010

Antibody formation

—

~50% at 26 weeks; non-neutralising in most; rare hypersensitivity (<1%)Sévigny 2008

GI symptoms

—

Nausea, diarrhea (mild, transient)

Absolute Contraindications

GHK-Cu

·Wilson disease (copper-overload disorder)
·Pregnancy / breastfeeding
·Known copper hypersensitivity

Tesamorelin

·Active malignancy or history of treated cancer
·Pregnancy
·Hypersensitivity to tesamorelin or mannitol
·Disruption of hypothalamic-pituitary axis (trauma, tumour, radiation)

Relative Contraindications

GHK-Cu

·Hemochromatosis (copper-iron crosstalk theoretical)
·Concurrent copper-chelator therapy

Tesamorelin

·Untreated diabetes (monitor HbA1c)
·Severe carpal tunnel syndrome
·Acute critical illness

05Administration Protocol

Parameter

GHK-Cu

Tesamorelin

1. Reconstitution

Add 1–2 mL bacteriostatic water to a 50 mg vial → 25–50 mg/mL. Use within 30 days, refrigerated.

Add 2.1 mL sterile water to 2 mg lyophilised vial. Roll gently — do not shake. Solution should be clear.

2. Injection site

SQ — local to the area of interest (face, scalp) for skin / hair indications. Rotate sites.

Subcutaneous — abdomen preferred. Rotate sites (avoid same spot within 2 cm). Avoid navel and waistband area.

3. Timing

Anytime; evening preferred. Topical: apply to clean dry skin.

Once daily. Preferred: evening, 2–3 hrs post-meal, before sleep — aligns with natural GH secretion pulse.

4. Storage

Lyophilised: room temp, light-protected. Reconstituted: refrigerate, light-protected, ≤30 days.

Lyophilised: room temp, light-protected. Reconstituted: refrigerate 2–8 °C, use within 21 days.

5. Needle

30–31G, short (4–6 mm) for shallow SQ. Topical: clean fingertips, no needle.

27–31G, 4–8 mm insulin syringe. Pinch skin, 45° angle for lean individuals.

06Stack Synergy

GHK-Cu

+ BPC-157

Moderate

View BPC-157 →

GHK-Cu drives ECM remodelling and copper-dependent enzymes; BPC-157 upregulates VEGFR2 angiogenesis and fibroblast migration. The pathways are non-overlapping and complementary — together they accelerate wound healing more than either alone in anecdotal protocols.

GHK-Cu: 1–2 mg SQ · daily near wound
BPC-157: 250–500 mcg SQ · daily near wound
Primary benefit: Combined ECM rebuilding + angiogenesis for tissue repair

Tesamorelin

+ Ipamorelin

Strong

View Ipamorelin →

Tesamorelin (GHRH analogue) and ipamorelin (GHRP / ghrelin mimetic) act on two distinct receptor systems to amplify GH release synergistically — GHRH receptor + ghrelin receptor. This dual-axis stimulation produces a more robust, sustained GH pulse than either alone while maintaining physiological pulsatility. Ipamorelin is highly selective with minimal cortisol or prolactin elevation, making it the preferred GHRP pairing.

Tesamorelin: 2 mg SQ · evening
Ipamorelin: 200–300 mcg SQ · same injection
Frequency: Once daily, pre-sleep
Primary benefit: Maximal GH pulsatility, fat loss, recovery, sleep quality

Raun 1998