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 Alpha-1 is clinically used in some countries as an immunomodulator for chronic hepatitis B/C and as an adjuvant in cancer therapy, enhancing cell-mediated immunity41487.
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 Alpha-1 is a 28-amino-acid thymic peptide fragment of prothymosin alpha that activates dendritic cells and T cells primarily via TLR9/MyD88/NF-κB signaling, enhancing Th1 responses and NK-cell cytotoxicity414.
Semax
Targets are not fully defined; interacts with melanocortin-related pathways and inhibits certain peptidases, but no single dominant receptor has been established174
Thymosin Alpha-1
Toll-like receptors, predominantly TLR9 (and also TLR2/TLR3) on plasmacytoid dendritic cells and other immune cells4
Semax
POMC
Thymosin Alpha-1
PTMA
The clearest overlap between Semax and Thymosin Alpha-1 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 Alpha-1 is more often associated with the realm of Immunology and inflammation and Oncology. Both appear to work through Signaling modulator, but the functional emphasis still separates, with Semax leaning toward Neuroprotection and cognition and Thymosin Alpha-1 leaning toward Immune regulation and Anti-inflammatory. Semax has a more synthetic analog origin, while Thymosin Alpha-1 is closer to natural endogenous background and their development context also differs, with Semax approved for Research use only while Thymosin Alpha-1 is approved. Thymosin Alpha-1 incorporates acetylation features that are not part of Semax.
No related articles are linked to these peptides yet.