From saving ancient artifacts to powering missiles, this petroleum derivative does it all.

Nature · Published 29 September 2026 Swipe more like this →

In short: Polyethylene glycol is a versatile compound found in everything from laxatives and vaccines to the fuel of Trident II missiles. While often considered biologically inert, this petroleum-derived polyether is a master of stabilization, preservation, and molecular engineering, serving as a silent workhorse across medicine, archaeology, and industrial manufacturing.

Polyethylene glycol, or PEG, is a polyether compound derived from petroleum that appears in diverse forms depending on its molecular weight. Its utility stems from its ability to act as a stabilizer, solvent, and structural agent. In archaeology, it is famously used to preserve waterlogged wood, such as the warship Vasa, by replacing water within the cellular structure to prevent warping. Similarly, it has been instrumental in protecting the painted colors of the Terracotta Warriors in China, where it prevents lacquer from curling upon exposure to dry air.

In the medical field, PEG is a staple excipient in pharmaceuticals, including oral laxatives and mRNA vaccines, where it coats lipid bubbles to provide stability. Its role in biotechnology is equally significant; researchers use it to fuse cells, concentrate viruses, and shield gene therapy vectors from immune system inactivation. Furthermore, PEG hydrogels are being explored for advanced applications like gum disease treatment and vascular disease modeling, where they provide a controlled microenvironment for encapsulated cells.

Beyond biology, PEG serves critical industrial and scientific functions. It acts as a lubricant in printer heads, a surfactant, and a component in solid rocket fuel for ballistic missiles. It is also a key tool in laboratory research, serving as a precipitant for DNA isolation and a calibration compound in mass spectrometry. While generally considered inert, its ability to form complexes with ions means it can influence biochemical reactions, a nuance that researchers must account for when using it to mimic crowded cellular conditions in vitro.

Despite its widespread use, PEG is not without risks. It has been linked to rare allergic reactions in vaccines, leading to regulatory advisories in the United Kingdom and Canada. Nevertheless, its versatility continues to drive innovation, with ongoing research into its potential use in liquid body armor, diabetes-monitoring tattoos, and solid polymer electrolytes for future battery technologies.

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