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 Semax is used clinically in Russia for ischemic stroke and cognitive disorders; in models it improves learning, protects dopaminergic neurons, and modulates stress responses without significant endocrine ACTH-like effects166174, Thymosin Beta-4 promotes wound healing, angiogenesis, and tissue regeneration in preclinical models via effects on cytoskeleton dynamics, cell migration, and anti-apoptotic pathways25579.
While Semax works as a synthetic heptapeptide, Met-Glu-His-Phe-Pro-Gly-Pro (MEHFPGP), that is an analog of ACTH(4–10) with a Pro-Gly-Pro extension and exerts neurotrophic and neuroprotective actions partly via upregulation of BDNF and modulation of dopaminergic and glutamatergic systems40162165174, Thymosin Beta-4 is an endogenous 43-amino-acid actin-sequestering peptide that maintains a pool of G-actin monomers and regulates actin polymerization, thereby influencing cell migration, proliferation, and differentiation25579.
Semax
POMC
Thymosin Beta-4
TMSB4X
The clearest overlap between Semax and Thymosin Beta-4 is that both converge around Signaling modulator. Their typical research and application settings separate fairly clearly: Semax is more often discussed in the realm of Neurology and brain health and Ophthalmology, whereas Thymosin Beta-4 is more often associated with the realm of Musculoskeletal health, Cardiovascular health, and Dermatology and aesthetics. Both appear to work through Signaling modulator, but the functional emphasis still separates, with Semax leaning toward Neuroprotection and cognition and Thymosin Beta-4 leaning toward Tissue repair and healing, Angiogenesis modulation, and Anti-inflammatory. Semax has a more synthetic analog origin, while Thymosin Beta-4 is closer to natural endogenous background with Semax approved for Research use only and Thymosin Beta-4 in Clinical phase 2. Thymosin Beta-4 incorporates acetylation features that are not part of Semax.