Acetyl tetrapeptide-5
is used in cosmetic eye formulations to decrease puffiness, eye bags, and dark circles by reducing edema and protecting proteins such as SOD from glycation
Alanine
Ala / A · hydrophobic residue · neutral charge
AOD-9604
is studied as an anti-obesity peptide that can reduce weight gain and increase fat oxidation in obese animal models with generally neutral effects on IGF-1 and glucose metabolism in early human trials
Arginine
Arg / R · basic residue · positive charge
Argireline
is a topical cosmetic peptide reported to decrease dynamic wrinkles by partially mimicking the mechanism of botulinum toxin in a non-invasive manner
Asparagine
Asn / N · polar residue · neutral charge
Aspartic acid
Asp / D · acidic residue · negative charge
BPC-157
is investigated for accelerating healing of gastrointestinal mucosa, tendons, ligaments, bone, and nervous tissue in preclinical models, with anti-inflammatory and pro-angiogenic effects
Comparison
While GHRP-2 is used in research to induce robust GH pulses and study anabolic and metabolic effects; clinically developed as pralmorelin for GH deficiency diagnostics6272, PEG-MGF is used experimentally to enhance muscle repair and hypertrophy after mechanical overload or injury by stimulating satellite-cell activation and protein synthesis6373138.
While GHRP-2 works as a second-generation hexapeptide growth hormone–releasing peptide that mimics ghrelin by agonizing GHSR-1a, strongly stimulating pulsatile GH release and modestly raising prolactin, ACTH, and cortisol62723096, PEG-MGF is a poly(ethylene glycol)-conjugated form of Mechano Growth Factor (IGF-1Ec splice variant) comprising the 24-aa C-terminal E-peptide of IGF-1, designed to extend half-life while activating IGF-1 receptor–mediated anabolic signaling in muscle satellite cells637322138.
GHRP-2
GHSR
PEG-MGF
IGF1
GHRP-2 and PEG-MGF are noticeably different, with limited direct overlap in their usual biological context. Both are often discussed in Musculoskeletal health contexts, while GHRP-2 is more of a hormone peptide and PEG-MGF is better described as a signal peptide. Their biological logic is quite different: GHRP-2 is a receptor agonist, whereas PEG-MGF is a growth factor mimetic and a signaling modulator. GHRP-2 has a more synthetic design origin, while PEG-MGF is closer to synthetic analog background with GHRP-2 in Clinical phase 1 and PEG-MGF in Preclinical development. GHRP-2 takes the form of a linear peptide, whereas PEG-MGF is closer to a peptide conjugate, while GHRP-2 carries d-amino acid substitution and amidation features, while PEG-MGF instead reflects pegylation changes.
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