Under 21 CFR 184.1751, sodium citrate "is the sodium salt of citric acid," prepared "by neutralizing citric acid with sodium hydroxide or sodium carbonate." It is affirmed as generally recognized as safe as a direct human food ingredient and "is used in food with no limitation other than current good manufacturing practice."
Sodium citrate is affirmed GRAS under 21 CFR 184.1751 - the sodium salt of citric acid, made by neutralizing citric acid with sodium hydroxide or carbonate, used "with no limitation other than current good manufacturing practice."