Zinc acetate

Zinc acetate is the zinc salt of acetic acid, used in food as a flavour modifier and astringency agent. Its primary food application in the EU is in chewing gum, where it contributes a mild metallic-astringent quality and has been studied for its potential to support oral health through its antimicrobial properties against the bacteria associated with dental plaque and bad breath. The acetic acid component of zinc acetate provides a subtle sharpness to flavour, while the zinc ion contributes the characteristic astringency.

JECFA established an ADI of 1 mg/kg body weight per day for zinc acetate in 1982, expressed as zinc. This limit reflects the dual nature of zinc as both an essential mineral (required for immune function, wound healing, taste and smell perception, and numerous enzymatic reactions) and a potential toxicant at excessive intake levels. At the trace quantities used in food additives, dietary zinc from this source is within normal nutritional ranges and far below levels associated with adverse effects.

Zinc acetate is approved in the EU as E650 for use specifically in chewing gum, where its flavour-modifying and potential oral health benefits are most relevant. It also serves as a source of dietary zinc in the formulation, contributing to zinc intake alongside other dietary sources such as meat, shellfish, nuts, and seeds. Consumers who already take zinc supplements should note that combined zinc intake from supplements and zinc-containing food additives should remain within tolerable upper intake levels, as chronic excess zinc can interfere with copper absorption. For most consumers, zinc from chewing gum is a modest and safe contribution to total mineral intake.