Side-by-side · Research reference
IGF-1 LR3vsSemax
Side-by-side comparison across mechanism, dosage, evidence, side effects, administration, and stack synergies. Citations on every claim where available.
AAnimal-StrongHUMAN-REVIEWED10/58 cited
BHuman-MechanisticAUTO-DRAFTED12/39 cited
IGF-1 LR3
IGF-1 Analogue · Research
3–10×Potency vs IGF-I
Low IGFBPBinding affinity
ResearchStatus
Research only · SQ typical in animal models
Semax
Cognitive enhancer · Russian Pharma
Intranasal · 2–3×/day during cognitive demand
01Mechanism of Action
Parameter
IGF-1 LR3
Semax
Primary target
IGF-1 receptor (IGF-1R)McTavish 2009
BDNF / NGF expression + monoamine modulationKaplan 2017
Pathway
IGF-1R → IRS-1 → PI3K/Akt → Cell proliferation, protein synthesis, anti-apoptosisMuhlbradt 2009
↑ BDNF + NGF synthesis + 5-HT modulation → neuroplasticity + anxiolysis + cognitive enhancementKaplan 2017
Downstream effect
Enhanced cell proliferation, muscle anabolism, inhibition of apoptosis, increased telomerase activity
Improved memory + attention; reduced anxiety; neuroprotection in ischemiaKaplan 2017
Feedback intact?
No — exogenous IGF analogue bypasses GH-mediated regulation
—
Origin
Synthetic 83-AA analogue: 13-AA N-terminal extension + Arg substitution at position 3
Synthetic 7-AA peptide derived from ACTH(4-7) with C-terminal Pro-Gly-Pro stabilising tailKaplan 2017
Antibody development
—
—
02Dosage Protocols
Parameter
IGF-1 LR3
Semax
Research dose (animal models)
Variable by protocol and species
In vivo murine atherosclerosis studies used sustained delivery.
—
In vitro typical concentration
10–1000 ng/mLThomas 2007
Dose-dependent effects on follicle growth and estradiol production.
—
Half-maximal stimulation
0.6 nM LR3 vs 1.5 nM native IGF-1Price 2004
2.5-fold greater potency in lung fibroblast proliferation.
—
Human use
Not FDA-approved; no published human trials
—
Frequency
—
2–3× per day during cognitive demand
Lower / starter dose
—
100 mcg / dose
Duration
—
10–14 day cycles, repeated PRN
Reconstitution
—
Pre-formulated nasal spray (commercial); research vial: bacteriostatic water
Timing
—
Morning + early afternoon
Half-life
—
Short plasma; CNS effect lasts ~3–6 hr
03Metabolic / Fat Loss Evidence
Parameter
IGF-1 LR3
Semax
Mechanism
IGF-1R activation → lipolytic signaling; secondary to anabolic effects
—
Direct lipolytic evidence
Minimal — primarily anabolic/anti-apoptotic in literature
—
Atherosclerotic plaque effects
Reduced stenosis and core size in ApoE-KO micevon 2011
Plaque stabilization via vSMC phenotype modulation, not direct fat loss.
—
Human data
None published
—
04Side Effects & Safety
Parameter
IGF-1 LR3
Semax
Hypoglycemia risk
Theoretical — IGF-1 analogues can lower blood glucose
—
Excessive cell proliferation
Mitogenic signaling; theoretical tumor promotion risk
—
Telomerase activation
2–10-fold increase in prostate cancer cells (PC-3, DU-145, LAPC-4)Wetterau 2003
Critically involved in cancer cell immortalization.
—
Oocyte degeneration
Increased oocyte degeneration at high doses (≥1000 ng/mL) in bovine folliclesThomas 2007
—
Unregulated anabolism
Bypasses physiological GH/IGF-1 feedback; no pulsatility control
—
Unknown human safety profile
No published human trials; safety data absent
—
Nasal irritation
—
Mild burning or congestion (transient)
Sleep disruption
—
Late-day dosing may interfere with sleep
Headache
—
Uncommon, transient
Long-term safety
—
Limited Western RCT data
Pregnancy / OB
—
Avoid
Absolute Contraindications
IGF-1 LR3
- ·Active malignancy or history of cancer
- ·Not approved for human use
Semax
- ·Pregnancy / breastfeeding
Relative Contraindications
IGF-1 LR3
- ·Diabetes or glucose intolerance
- ·Family history of cancer
Semax
- ·Active psychiatric instability
- ·Concurrent strong stimulants
05Administration Protocol
Parameter
IGF-1 LR3
Semax
1. Research use only
IGF-1 LR3 is not FDA-approved for human use. All administration data derives from animal or in vitro studies.
Pre-formulated nasal spray (commercial) or research vial reconstituted with bacteriostatic water.
2. Typical research route
Subcutaneous or intraperitoneal injection in animal models. In vitro: added directly to culture medium at concentrations of 10–1000 ng/mL.Thomas 2007
Intranasal — 2–3 sprays per nostril per dose. Tilt head slightly back.
3. Reconstitution (research)
Lyophilised powder reconstituted in sterile water or buffered saline per manufacturer protocol. Store at 2–8 °C after reconstitution.
Morning + early afternoon. Avoid evening (sleep disruption).
4. Stability
Enhanced stability vs native IGF-1 due to reduced IGFBP binding; exact half-life in vivo not fully characterized in humans.
Refrigerate after reconstitution; light-protected.
5. Caveat
—
Cycle on/off to avoid neurochemical adaptation.
06Stack Synergy
IGF-1 LR3
+ GHRP-6
Multi-pathwayGHRP-6 stimulates endogenous GH release, which drives hepatic IGF-1 synthesis. IGF-1 LR3 provides exogenous, IGFBP-resistant IGF signaling. Combining upstream GH stimulation with downstream IGF receptor activation creates a dual-pathway anabolic effect. However, this bypasses natural feedback and carries compounded mitogenic risk.
- GHRP-6
- 100–200 mcg SQ · 2–3× daily
- IGF-1 LR3
- Research doses variable · post-workout typical in animal models
- Note
- Research context only — no human protocols exist
- Primary benefit
- Theoretical maximal anabolic signaling (GH + IGF axes)
+ Ipamorelin
Multi-pathwayIpamorelin (selective GHRP) stimulates pulsatile GH release without cortisol/prolactin elevation. IGF-1 LR3 directly activates IGF-1R independent of GH. This stack targets both upstream (GH secretion) and downstream (IGF receptor) nodes but eliminates physiological feedback, raising safety concerns around unchecked proliferation.
- Ipamorelin
- 200–300 mcg SQ · evening
- IGF-1 LR3
- Research doses only · timing variable
- Caution
- No human data; animal/in vitro only
- Primary benefit
- Dual-axis anabolic signaling (theoretical)
Semax
+ Selank
ModerateSemax (cognitive enhancer, BDNF/NGF) and Selank (anxiolytic + immune) form the canonical Russian "neuro stack" — both intranasal peptide bioregulators with complementary axes. Semax for cognitive demand; Selank for stress mitigation.
- Semax
- 200–600 mcg intranasal · morning + afternoon
- Selank
- 150–300 mcg intranasal · midday + early evening
- Primary benefit
- Cognitive enhancement + stress mitigation