Polyglycerol polyricinoleate

Polyglycerol polyricinoleate, known by its abbreviation PGPR, is a synthetic emulsifier produced by reacting polymerised glycerol with condensed castor oil fatty acids (ricinoleic acid). In food, it is used almost exclusively in chocolate manufacturing, where even small concentrations — typically 0.2 to 0.5% — dramatically reduce the viscosity of molten chocolate, enabling manufacturers to use less cocoa butter. This makes it a cost-effective ingredient in mass-market chocolate products.

JECFA evaluated PGPR in 1974 and established an ADI of 7.5 mg per kilogram of body weight per day. For a 70 kg adult this equates to 525 mg per day — an amount far exceeding realistic dietary intake from chocolate consumption. Comprehensive toxicological and carcinogenicity studies conducted prior to regulatory approval showed no adverse effects at relevant doses.

PGPR is approved in the EU (E476), the United States, and most international markets. It is derived from castor oil rather than dairy or soy, making it relevant for consumers managing soy lecithin (E322) allergies, as PGPR is sometimes used as a direct substitute. The main consumer concern is that its use signals reduced cocoa butter content in chocolate, affecting flavour quality, rather than any safety issue. Looksee classifies it as safe based on the JECFA ADI evaluation.