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 Epitalon is reported to increase lifespan and reduce tumor incidence in animals, and to influence differentiation of neural and mesenchymal stem cells; is studied as an epigenetic regulatory peptide36, 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.
While Epitalon works as a synthetic tetrapeptide, Ala-Glu-Asp-Gly (AEDG), that has been shown to bind histones and modulate gene expression and chromatin state, with reported effects on pineal function, neurogenesis, and longevity in animal models36, GHK-Cu is 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.
Epitalon
Binds nuclear histone proteins (H1, H2B, H3, H4) rather than a classic membrane receptor36
GHK-Cu
Not clearly established in the current dataset.
Epitalon
Not assigned in the current dataset.
GHK-Cu
Not assigned in the current dataset.
Both peptides fall into a similar broad context as Signal peptides, although the details of how they are used and discussed still diverge. Both are often discussed in Aging and longevity contexts, while Epitalon is more of a neuropeptide and GHK-Cu is better described as a matrikine. Both appear to work through Signaling modulator and Gene expression modulator, but the functional emphasis still separates, with Epitalon leaning toward Mitochondrial function modulation and GHK-Cu leaning toward Collagen and elastin stimulation and Tissue repair and healing. Epitalon has a more synthetic analog origin, while GHK-Cu is closer to natural endogenous background and their development context also differs, with Epitalon approved for Research use only while GHK-Cu is cosmetic grade. They share some route overlap through subcutaneous injection, while the remaining routes diverge.