Polyethylene glycol 8000

Polyethylene glycol 8000 (PEG 8000) is a high-molecular-weight polymer of ethylene oxide, designated by its average molecular weight of approximately 8,000 daltons. In food applications it serves as a surface coating agent for food supplements, forming a protective film on tablet and capsule surfaces that improves moisture resistance, facilitates swallowing, and provides a clean, smooth appearance. It is also used as a carrier and solvent for food additives in some processing applications. Its high molecular weight distinguishes it from lower-molecular-weight PEGs used in pharmaceutical and industrial contexts.

No JECFA numerical ADI has been assigned to PEG 8000 in food additive contexts. High-molecular-weight polyethylene glycols are poorly absorbed from the gastrointestinal tract — they remain largely within the intestinal lumen and are excreted essentially unchanged. This very limited systemic exposure underpins the absence of a specific numerical limit. Low-molecular-weight PEGs (such as PEG 400) have been more extensively studied pharmacologically, and the safety profile improves with increasing molecular weight due to decreasing absorption.

PEG 8000 is approved in the EU as E1521 for use specifically on the surface of food supplements, where it is applied as a tablet coating in amounts consistent with functional requirements. It is also used industrially as a lubricant and mould-release agent in food manufacturing equipment, but in direct food additive applications its scope is restricted. Consumers who take food supplement tablets may encounter it as a coating material. The compound is also used in pharmaceutical laxative preparations at much higher doses (under the name macrogol or polyethylene glycol), where it draws water into the colon osmotically. At the trace levels used in food supplement coatings, no laxative or adverse effect is expected.