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E337AcidulantLow concern
Sodium Potassium Tartrate
In plain words
The short version
Rochelle salt — a mixed-cation tartrate buffer; also famous for its piezoelectric crystals.
Why it's green
It's widely considered safe at the amounts used in food, so we mark it green. The Safety section below has the details.
Safety profile
ADI of 0–30 mg/kg body weight (combined tartrates). Same safety profile as the other tartrate salts. Mild laxative at high doses, like other tartrates.
The detail
Educational information only. Not medical or dietary advice.