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, TB-500 is studied for enhancing musculoskeletal and cardiac repair, wound healing, and promoting cell migration and differentiation via actin cytoskeleton remodeling21255.
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, 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.
Selank
Not clearly established in the current dataset.
TB-500
Binds monomeric actin (G-actin) rather than a classical cell-surface receptor, modulating actin polymerization at barbed and pointed ends55
Selank
Not assigned in the current dataset.
TB-500
TMSB4X
The clearest overlap between Selank and TB-500 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 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 Selank leaning toward Anxiolytic and sleep modulation and Immune regulation and TB-500 leaning toward Tissue repair and healing, Angiogenesis modulation, and Anti-inflammatory. Both are synthetic in origin with Selank approved for Research use only and TB-500 in Preclinical development. Their sequence patterns also diverge, with Selank showing proline-rich features and TB-500 showing protein-mimetic sequence features.