Side-by-side · Research reference
HumaninvsMGF
Side-by-side comparison across mechanism, dosage, evidence, side effects, administration, and stack synergies. Citations on every claim where available.
AAnimal-StrongHUMAN-REVIEWED14/52 cited
BAnimal-StrongHUMAN-REVIEWED14/55 cited
Humanin
Mitochondrial-Derived Peptide · Cytoprotective
SQ · Experimental
MGF
IGF-1Ec Splice Variant · Muscle-Specific
SQ · Research context only
01Mechanism of Action
Parameter
Humanin
MGF
Primary target
Intracellular: Bax, Bim, tBid (pro-apoptotic Bcl-2 family). Extracellular: FPRL1/2 G-protein-coupled receptorsZhu 2022Lue 2021
Satellite cells (Pax7+) in skeletal muscleMoore 2018
Pathway
Humanin binds Bax/Bim → inhibits mitochondrial outer membrane permeabilization (MOMP) → blocks cytochrome c release → prevents caspase activation → cell survival
Mechanical stress → IGF-1Ec mRNA upregulation → Local E-domain peptide release → Satellite cell activation
Downstream effect
Suppression of apoptosis, mitochondrial stabilization, reduced oxidative stress, preservation of germ cells and neurons under stressZhu 2022Lue 2021Velentza 2024
Satellite cell proliferation, myoblast differentiation, muscle fiber repair
Feedback intact?
Not applicable — peptide acts as anti-apoptotic signal, not hormonal axis
—
Origin
Encoded by short open reading frame in mitochondrial 16S rRNA gene (MTRNR2). 24-28 amino acids. 13 homologous variants (MTRNR2L1-L13) identified.Zhu 2022Shahzaib 2026
Alternative splicing of IGF-1 gene (exons 4-6) produces IGF-1Ec precursor; E-domain cleaved post-translationallyArmakolas 2016Vassilakos 2017
Antibody development
Not reported in animal models
—
02Dosage Protocols
Parameter
Humanin
MGF
Standard experimental dose (HNG)
4 mg/kg IP (rat)
Most common dose in rodent models.
—
Ex vivo bone culture
1 µg/mL
Protective against venetoclax-induced bone growth retardation.
—
Frequency
Daily (IP)
—
Duration
8–12 weeks in animal studies
—
Human data
None — no clinical trials reported
—
Analog (HNG)
Gly[14]-humanin — more potent variant
Substitution at position 14 enhances cytoprotective activity.
—
Synthetic peptide
—
24-amino-acid E-domain sequence
Corresponds to human IGF-1Ec exons 4-6 region.
Rodent cardiac model
—
200 μg/kg via peptide-eluting microstructures
Post-MI injection; improved ejection fraction by 8 weeks.
Acute delivery (mouse MI)
—
Single bolus within 12 hrs post-infarctionShioura 2014
Delayed decompensation; no human protocol established.
Human evidence
—
None — no published clinical trials
All dosing extrapolated from animal models.
Detection in doping
—
Full-length MGF detected via LC-MS in illicit productsThevis 2014
WADA-prohibited since 2005; no therapeutic indication.
03Metabolic / Fat Loss Evidence
Parameter
Humanin
MGF
Direct fat loss evidence
None
—
Mechanism overlap
Mitochondrial health may indirectly influence metabolic efficiency, but no quantified effect
—
04Side Effects & Safety
Parameter
Humanin
MGF
Animal model safety
Well-tolerated in rat and mouse studies at 4 mg/kg for 8–12 weeks
—
Human safety data
None — no clinical trials
None — no clinical trials published
Theoretical fibrillation risk
Induces amyloid-like fibrillation of Bax/BID. Long-term sequelae unknown.
—
Injection site reaction
Not reported in animal studies (IP route)
—
Reproductive safety
Protective in POI model (cyclophosphamide-induced), no adverse effects on fertility notedHuang 2025
—
Theoretical IGF-1 axis risk
—
Chronic IGF-1Ec overexpression linked to cancer progression (prostate, colorectal, breast)
Tumor promotion
—
IGF-1Ec overexpressed in osteosarcoma, colorectal polyps with dysplasia, endometrial cancer
Antibody development
—
Unknown — no longitudinal human exposure data
Local injection reaction
—
Presumed similar to other peptides (erythema, induration) — no direct evidence
Dysregulated expression with age
—
Older adults (70+ yrs) show blunted IGF-1Ec response post-exercise vs youngMoore 2018
Absolute Contraindications
Humanin
- ·Unknown — no human data
MGF
- ·Active malignancy or history of IGF-1-sensitive cancers (prostate, colorectal, breast, osteosarcoma)
- ·No established therapeutic use — investigational only
Relative Contraindications
Humanin
- ·Active malignancy (theoretical risk of anti-apoptotic effect on tumour cells)
MGF
- ·Family history of IGF-1-axis malignancies
- ·Use outside research setting
05Administration Protocol
Parameter
Humanin
MGF
1. Route (experimental)
Intraperitoneal (IP) in animal models. Subcutaneous route untested. No human protocols exist.
MGF (E-domain peptide) has no approved clinical protocol. All published data derive from animal models or in vitro experiments.
2. Reconstitution
Synthetic peptide reconstituted in sterile saline or PBS. No commercial formulation available.
Commercially available MGF corresponds to the 24-amino-acid human E-domain (hEc). Rodent E-domain (Eb) is structurally distinct and not interchangeable.
3. Timing
Daily administration in animal studies. Optimal timing not characterized.
Rodent studies used peptide-eluting polymeric microstructures (cardiac) or direct intramuscular injection. Routes and doses non-translatable to humans.Peña 2015Shioura 2014
4. Storage
Lyophilised powder: -20 °C. Reconstituted: 4 °C, use within 7 days. Avoid freeze-thaw cycles.
MGF peptides prohibited in sport since 2005. Detection via LC-MS established for full-length MGF products.Thevis 2014
5. Human use
No FDA approval, no IND, no clinical trials. Experimental research tool only.
Any human use falls outside approved medical practice and regulatory frameworks. No safety or efficacy data exist.
06Stack Synergy
Humanin
+ MOTS-c
Multi-pathwayBoth are mitochondrial-derived peptides. MOTS-c enhances metabolic efficiency and insulin sensitivity via AMPK activation, while humanin prevents mitochondrial apoptosis. Combined, they address mitochondrial function (MOTS-c) and survival signaling (humanin), supporting cellular resilience under metabolic and oxidative stress.
- Humanin
- 4 mg/kg IP · daily (animal model)
- MOTS-c
- 5 mg/kg IP · daily (animal model)
- Frequency
- Once daily
- Primary benefit
- Mitochondrial health, metabolic efficiency, anti-apoptotic signaling
MGF
+ BPC-157
Multi-pathwayMGF activates satellite cells for muscle fiber repair; BPC-157 promotes angiogenesis, collagen synthesis, and tendon healing via distinct pathways (VEGF, FAK, integrin signaling). Theoretical synergy in post-injury contexts combines myogenic (MGF) and stromal (BPC-157) repair mechanisms. Both lack human validation.
- MGF
- No established dose
- BPC-157
- 250–500 mcg SQ near injury site
- Context
- Animal models only
- Primary benefit
- Theoretical multi-tissue repair (muscle + tendon/ligament)
+ TB-500
ModerateTB-500 (thymosin beta-4 fragment) enhances actin polymerization, cell migration, and angiogenesis—complementary to MGF satellite cell activation. Both upregulated post-injury; combined use presumed additive for muscle regeneration in preclinical models.
- MGF
- No established dose
- TB-500
- 2–5 mg SQ weekly
- Context
- Animal models only
- Primary benefit
- Satellite cell activation + enhanced migration/angiogenesis