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 GHK-Cu acts as a tissue-remodeling and wound-healing signal, enhancing skin regeneration, angiogenesis, and repair while reducing inflammation and oxidative damage in experimental models31383, 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 GHK-Cu works as an endogenous tripeptide, Gly-His-Lys, that chelates Cu²⁺ and modulates gene expression, stimulating collagen, elastin, proteoglycan, and glycosaminoglycan synthesis while exerting antioxidant and anti-inflammatory effects31383, 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.
GHK-Cu
Not assigned in the current dataset.
PEG-MGF
IGF1
Both peptides fall into a similar broad context as Signal peptides, although the details of how they are used and discussed still diverge. Their typical research and application settings separate fairly clearly: GHK-Cu is more often discussed in the realm of Dermatology and aesthetics and Aging and longevity, whereas PEG-MGF is more often associated with the realm of Musculoskeletal health and Cardiovascular health. Both appear to work through Signaling modulator, but the functional emphasis still separates, with GHK-Cu leaning toward Collagen and elastin stimulation and Antioxidant activity and PEG-MGF leaning toward Anabolic growth. GHK-Cu has a more natural endogenous origin, while PEG-MGF is closer to synthetic analog background and their development context also differs, with GHK-Cu cosmetic grade while PEG-MGF is in Preclinical development. PEG-MGF incorporates pegylation features that are not part of GHK-Cu.