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Research-focused articles covering peptide science, mechanisms, evidence quality and related laboratory research topics.
Retatrutide and semaglutide are both peptide-based compounds studied in metabolic research, but they are not simply stronger and weaker versions of the same molecule. Their most important difference is receptor pharmacology: semaglutide is designed primarily as a GLP-1 receptor agonist, whereas retatrutide is a triple agonist that engages GLP-1, GIP and glucagon receptors. This guide…
Peptides can be produced in more than one way. Two of the most important routes are chemical synthesis and recombinant expression. Both can produce well-defined peptide material, but they use very different manufacturing systems and create different technical advantages, limitations and impurity profiles. This guide explains how synthetic and recombinant peptides differ, why one method…
A practical overview of how synthetic peptides are assembled, cleaved, purified and analytically checked, including solid-phase peptide synthesis, RP-HPLC and mass spectrometry.
A research-focused guide to lyophilized peptide stability, including freeze-drying, residual moisture, temperature, light, oxygen, storage claims and stability after reconstitution.
A practical research guide to reading a peptide Certificate of Analysis, including batch matching, HPLC purity, mass-spectrometry identity, peptide content, chromatograms, test dates and common limitations.
A research-focused guide to peptide purity testing, including RP-HPLC, mass spectrometry, LC-MS, chromatographic area purity, absolute peptide content, common impurities and how to interpret a peptide COA.
Updated August 2026. Nicotinamide adenine dinucleotide (NAD+) is a central coenzyme in cellular metabolism. It acts both as a redox carrier, cycling between NAD+ and NADH, and as a consumed substrate for signaling enzymes such as sirtuins, PARPs and CD38. Those two roles make NAD+ important to energy metabolism, DNA-repair signaling, stress responses and mitochondrial…
Updated August 2026. BPC-157 has a large preclinical literature but a very small human evidence base. That distinction is often blurred online. Most mechanistic claims about tendon repair, angiogenesis, gastrointestinal protection, nitric-oxide signaling and tissue recovery come from cell and animal studies rather than large controlled human trials. This article separates the evidence by level:…
Updated August 2026. MOTS-c is a 16-amino-acid mitochondrial-derived peptide encoded within a short open reading frame in mitochondrial 12S rRNA. It was first described in 2015 as a signaling peptide involved in metabolic homeostasis, with early work linking its cellular effects to folate-cycle disruption, AICAR accumulation and activation of AMP-activated protein kinase (AMPK). MOTS-c is…
Updated August 2026. TB-500 and thymosin beta-4 are often discussed as though they are interchangeable names, but that is not a reliable way to read the scientific literature. Thymosin beta-4 (Tβ4) is a defined endogenous 43-amino-acid peptide with a substantial research record in actin regulation, cell migration, wound models and tissue repair. The label TB-500,…
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