5-Amino-1MQ is not a peptide. It is a small-molecule quinolinium — a single aromatic ring system rather than an amino-acid chain — and that distinction matters for anyone sourcing it, because it changes the analytical methods, the salt-form questions, and the literature it belongs to. What makes it a heavily studied research compound is its…

Selank is a synthetic heptapeptide derived from tuftsin, the immunoglobulin G–derived tetrapeptide Thr-Lys-Pro-Arg. What makes it unusual in the research literature is that it does not appear to work through a single receptor: the published mechanistic work describes at least two distinct molecular actions running in parallel — modulation of GABAergic gene expression and receptor…

Semax is a synthetic heptapeptide derived from the ACTH(4–10) fragment of adrenocorticotropic hormone, and it has become one of the most frequently referenced peptide tools in laboratories studying neurotrophin signaling. Because it engages the brain-derived neurotrophic factor (BDNF) / TrkB axis — a signaling system that sits at the center of neuronal survival, synaptic plasticity,…

NAD+ — nicotinamide adenine dinucleotide — is one of the most heavily studied small molecules in modern cell biology, and unlike most compounds in the research-peptide market it is not a peptide at all. It is a dinucleotide coenzyme present in every living cell, functioning simultaneously as the central electron carrier of metabolism and as…

PT-141 is the research-market name for bremelanotide, a synthetic cyclic heptapeptide analogue of alpha-melanocyte-stimulating hormone (α-MSH) that acts as a non-selective agonist across the melanocortin receptor family. Because it engages the central melanocortin receptors MC3R and MC4R — two of the most structurally and pharmacologically scrutinized G-protein-coupled receptors in neuroscience — PT-141 has become a…

TB-500 is the name the research-compound market has attached to thymosin beta-4 (Tβ4), one of the most-studied actin-regulating peptides in cell biology. Thymosin beta-4 is a 43-residue, naturally occurring peptide that functions as the principal G-actin-sequestering molecule in most mammalian cells, and it has been examined across three decades of preclinical work in wound-repair, corneal,…

MOTS-c — short for “Mitochondrial Open-reading-frame of the Twelve-S rRNA type-c” — occupies an unusual place in peptide biology. It is one of a small family of mitochondrial-derived peptides (MDPs): short peptides encoded not in the nuclear genome but within the mitochondrial DNA itself, in a region of the 12S ribosomal RNA gene that was…

Epithalon — also written epitalon or epithalone, and abbreviated AEDG for its four-residue sequence — is one of the most-studied compounds in telomere-biology and geroprotection research. It is a synthetic tetrapeptide derived from the amino-acid composition of epithalamin, a peptide preparation originally isolated from the pineal gland. For laboratories modeling telomerase regulation, cellular replicative capacity,…

As the FDA’s Pharmacy Compounding Advisory Committee prepares to meet on July 23–24, 2026, the peptide sector is paying unusually close attention to compliance. The meeting itself concerns compounding-pharmacy regulation, but the broader climate — heightened regulatory scrutiny, a steady stream of warning letters, and public commentary from healthcare attorneys anticipating enforcement — has made…

CJC-1295 and ipamorelin are two of the most frequently co-referenced compounds in growth-hormone (GH) axis pharmacology research. They are studied together because they engage the somatotroph — the GH-secreting cell of the anterior pituitary — through two distinct and complementary receptor systems: CJC-1295 as a long-acting analog of growth hormone-releasing hormone (GHRH), and ipamorelin as…