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 Selank is a peptide developed in Russia as an anxiolytic and nootropic; in animal models it reduces anxiety-like behavior and modulates immune parameters under stress39, 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 Selank works as a synthetic heptapeptide, Thr-Lys-Pro-Arg-Pro-Gly-Pro, that combines a tuftsin fragment with a Pro-Gly-Pro motif and is reported to modulate GABAergic neurotransmission and cytokine balance while being resistant to proteolytic degradation39, 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.
Selank
Not clearly established in the current dataset.
Thymosin Beta-4
Binds actin monomers (G-actin) at both barbed and pointed ends to sterically block polymerization55
Selank
Not assigned in the current dataset.
Thymosin Beta-4
TMSB4X
The clearest overlap between Selank and Thymosin Beta-4 is that both converge around Signaling modulator. Their typical research and application settings separate fairly clearly: Selank is more often discussed in the realm of Neurology and brain health and Immunology and inflammation, 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 Selank leaning toward Anxiolytic and sleep modulation and Immune regulation and Thymosin Beta-4 leaning toward Tissue repair and healing, Angiogenesis modulation, and Anti-inflammatory. Selank has a more synthetic analog origin, while Thymosin Beta-4 is closer to natural endogenous background with Selank approved for Research use only and Thymosin Beta-4 in Clinical phase 2. Thymosin Beta-4 incorporates acetylation features that are not part of Selank, while their sequence patterns also diverge, with Selank showing proline-rich features and Thymosin Beta-4 showing protein-mimetic sequence features.