Side-by-side · Research reference

GHRP-2vsIGF-DES

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

APhase 2HUMAN-REVIEWED15/42 cited

BAnimal-StrongHUMAN-REVIEWED8/60 cited

GHRP-2

Hexapeptide GHRP · Phase 2 (clinical diagnostic)

100–300 mcgPer doseBowers 1990

Phase 2Evidence levelBowers 1990 Sigalos 2018

~30 minHalf-lifeMalagón 1999

SQ · Multiple sites · 1–3×/day

IGF-DES

IGF-1 Analogue · Truncated N-Terminal

~10×Potency vs IGF-1

ReducedIGFBP binding

ResearchStatus

Injection (local or systemic) · Research protocols onlyBredehöft 2008

01Mechanism of Action

Parameter

GHRP-2

IGF-DES

Primary target

Ghrelin receptor (GHS-R1a) on anterior pituitaryBowers 1990

IGF-1 receptor (IGF1R)Shields 2007

Pathway

GHS-R1a → Gαq → Ca²⁺ → GH vesicle exocytosisBowers 2002

IGF1R activation → PI3K/Akt & MAPK signaling → protein synthesis, proliferation

Downstream effect

Strong GH pulse + IGF-1 elevation; appetite increase via ghrelin agonismBowers 2002

Enhanced muscle protein synthesis, myoblast differentiation, reduced apoptosis, cell proliferation

Feedback intact?

Yes, with somatostatin feedback active

Unknown — no human endocrine feedback data

Origin

Synthetic hexapeptide; developed by Bowers/Tulane group in the 1980sBowers 1990

Synthetic truncation of native IGF-1 — removal of N-terminal Gly-Pro-Glu tripeptideBredehöft 2008

Antibody development

—

02Dosage Protocols

Parameter

GHRP-2

IGF-DES

Standard dose

100–300 mcg per injectionBowers 1990

—

Frequency

1–3× per day

Variable — daily to multiple times daily in research

Lower / starter dose

50 mcg per dose

—

Evidence basis

Phase 2 + clinical diagnostic useBowers 1990

Animal models + in vitro only

Duration

8–12 weeks on / 4 off (anecdotal)

—

Reconstitution

Bacteriostatic water

—

Timing

Pre-sleep + fasted preferred

—

Half-life

~30 minMalagón 1999

Shorter than IGF-1 due to reduced IGFBP binding

Rapid tissue uptake, limited systemic circulation.

Research dose range

—

10–100 ng/mL (in vitro); μg doses (animal models)

Highly context-dependent; no standardized human protocol.

Route

—

Subcutaneous or intramuscular (local injection favored)

Local delivery maximizes tissue-specific uptake.

Human data

—

None — no clinical trials

03Metabolic / Fat Loss Evidence

Parameter

GHRP-2

IGF-DES

Primary mechanism

—

Indirect via muscle hypertrophy → metabolic rate elevation

Direct lipolysis

—

Minimal evidence — IGF-1 axis primarily anabolic, not lipolytic

Prostate model

—

Inhibited BPH cell proliferation when combined with vitamin D3 analogueCrescioli 2002

Context-specific anti-proliferative effect, not fat loss.

04Side Effects & Safety

Parameter

GHRP-2

IGF-DES

Cortisol elevation

Mild but measurableBowers 1990

—

Prolactin elevation

Mild but measurable

—

Hunger

Strong appetite increase

—

Injection site reaction

Mild erythema

Expected — erythema, irritation, local swelling

IGF-1 elevation

Strong; monitor with chronic high-dose use

—

Cancer risk

Contraindicated in active malignancy

—

Pregnancy / OB

Avoid

—

Hypoglycemia risk

—

Theoretical — IGF-1 axis enhances glucose uptake

Mitogenic risk

—

Chronic IGF-1 receptor activation may promote cell proliferation, potential tumor growthCrescioli 2002

Edema / Fluid retention

—

Possible via sodium retention (IGF-1 axis effect)

Human safety data

—

Absent — no human trials, all effects theoretical or extrapolated

Unknown long-term effects

—

No chronic dosing studies in humans; endocrine, metabolic consequences unknown

Absolute Contraindications

GHRP-2

·Active malignancy
·Pregnancy / breastfeeding

IGF-DES

·Active malignancy or history of cancer (mitogenic risk)
·Pregnancy / lactation (no safety data)
·Hypoglycemia disorders

Relative Contraindications

GHRP-2

·Untreated diabetes

IGF-DES

·Diabetes mellitus (unpredictable glucose effects)
·Renal or hepatic impairment (clearance unknown)
·Edema-prone conditions (heart failure, nephrotic syndrome)

05Administration Protocol

Parameter

GHRP-2

IGF-DES

1. Reconstitution

Add 2 mL bacteriostatic water to 5 mg vial → 2.5 mg/mL.

Des(1-3)IGF-1 has no approved human protocol. All administration details are derived from animal or in vitro research and should not be construed as medical guidance.

2. Injection site

SQ — abdomen or thigh. Rotate sites.

Sterile water or bacteriostatic water per research protocol. Gently swirl; do not shake. Store reconstituted peptide at 2–8 °C.

3. Timing

Pre-sleep + fasted preferred.

Subcutaneous (abdomen, thigh) or intramuscular (deltoid, vastus lateralis). Local injection to target tissue (e.g., muscle group) may enhance regional uptake.

4. Storage

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

Frequency and timing vary by research design. Post-exercise or fasted state may theoretically enhance muscle uptake.

5. Needle

29–31G, 4–8 mm insulin syringe.

27–31G insulin syringe for subcutaneous; 25–27G for intramuscular.

6. Monitoring

—

Glucose monitoring essential (hypoglycemia risk). No established IGF-1 or safety labs for human use.

06Stack Synergy

GHRP-2

+ CJC-1295 (no DAC)

Strong

View CJC-1295 (no DAC) →

GHRP-2 + CJC-1295-no-DAC is a higher-amplitude alternative to the ipamorelin + CJC-1295 stack. GHRP-2 produces a stronger pulse but with cortisol + prolactin signal — choose when maximum GH amplitude is the goal and the side-effect tolerance is acceptable.

GHRP-2: 100–200 mcg SQ · pre-sleep
CJC-1295 (no DAC): 100 mcg SQ · same injection
Primary benefit: High-amplitude GH pulse, body composition

Bowers 1990 Teichman 2006

IGF-DES

+ BPC-157

Moderate

View BPC-157 →

Des(1-3)IGF-1 promotes myoblast differentiation and protein synthesis, while BPC-157 enhances tissue repair, angiogenesis, and collagen synthesis. Both act on distinct pathways (IGF1R vs gastric pentadecapeptide mechanisms) to support muscle recovery and connective tissue integrity. Synergy is mechanistic but lacks direct co-administration studies.

Des(1-3)IGF-1: Research dose post-workout (local IM)
BPC-157: 250–500 mcg SQ, daily or twice daily
Frequency: Daily or per research protocol
Primary benefit: Accelerated muscle repair, enhanced hypertrophy, connective tissue support

+ TB-500

Moderate

View TB-500 →

TB-500 (Thymosin Beta-4 fragment) promotes cell migration, angiogenesis, and wound healing via actin regulation. Des(1-3)IGF-1 drives protein synthesis and myoblast proliferation. Combined, these peptides may synergistically enhance muscle recovery, repair, and hypertrophy through complementary anabolic and regenerative pathways. No direct human co-administration data.

Des(1-3)IGF-1: Research dose post-workout (local IM)
TB-500: 2–5 mg SQ, 2× weekly
Frequency: Per research cycle
Primary benefit: Muscle hypertrophy, injury recovery, vascular support