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 PT-141 is FDA-approved for treatment of hypoactive sexual desire disorder in premenopausal women and is studied for sexual dysfunction in other populations, increasing sexual desire via CNS melanocortin pathways42101, TB-500 is studied for enhancing musculoskeletal and cardiac repair, wound healing, and promoting cell migration and differentiation via actin cytoskeleton remodeling21255.
While PT-141 works as the synthetic melanocortin receptor agonist bremelanotide, an analog of α-MSH that activates central MC3R and MC4R to modulate neuronal circuits governing sexual desire and arousal3242101, TB-500 is a synthetic peptide comprising the LKKTETQ actin-binding motif of thymosin beta-4 that binds G-actin, sequesters actin monomers, and promotes cell migration, angiogenesis, and tissue repair1255.
PT-141
POMC
TB-500
TMSB4X
The clearest overlap between PT-141 and TB-500 is that both converge around Signaling modulator. Their typical research and application settings separate fairly clearly: PT-141 is more often discussed in the realm of Reproductive health, whereas TB-500 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 PT-141 leaning toward and TB-500 leaning toward Tissue repair and healing, Angiogenesis modulation, and Anti-inflammatory. Both are synthetic in origin and their development context also differs, with PT-141 approved while TB-500 is in Preclinical development. PT-141 takes the form of a cyclic peptide, whereas TB-500 is closer to a linear peptide, while PT-141 incorporates acetylation features that are not part of TB-500.