Databases of food additives:

• United States — FDA's "Substances Added to Food", formerly known as EAFUS ("Everything" Added to Foods in the United States).
• United States — FDA's GRAS Substances (SCOGS) Database
  • SCOGS means "Select Committee on GRAS Substances". The committee was formed in 1972, and it produced 151 reports by the time it ended its work in 1982.
• EU — EU Food Additives List
  • E numbers, short for 'Europe numbers'. They cover products currently or previously sold in the European single market.
• Canada — Health Canada's Lists of Permitted Food Additives
• international — Codex Alimentarius [wikipedia], a joint project between the FAO and the WHO — GSFA (General Standard for Food Additives)
  • INS (International Numbering System for Food Additives) numbers
• TODO: Food Chemicals Codex