YenzoWhat is E337 (potassium sodium tartrate)?
Appendix 1 of Circular 24/2019/TT-BYT lists the functions of potassium sodium L(+)-tartrate as acidity regulator, emulsifying salt, sequestrant and stabilizer.
E337Sodium potassium tartrate
E337 is potassium sodium L(+)-tartrate, the mixed potassium and sodium salt of tartaric acid. In food it adjusts acidity, binds metal ions and helps keep products stable.
Did you know? EFSA, citing Regulation (EU) No 231/2012, lists E 337 (potassium sodium L(+)-tartrate) under the additional names Rochelle salt and Seignette salt.
- Code
- E337 · INS 337
In Vietnam✓ PermittedOn the list of permitted additives — Circular 24/2019, Appendix 1
Risk level on the Yenzo Scalevery low?Based on the Open Food Facts additives taxonomy
How E337 appears on labels
IngredientsIllustrative example
Wheat flour, vegetable oil, salt, sugar, acidity regulator (337), dried onion and garlic, pepper, natural colour (160a).
acidity regulator (337)acidity regulator 337E337INS 337On Vietnamese labels: Kali natri L(+)-tartrat
Sodium potassium tartrate in food
Edible ices and fruit icesJams, jellies, marmaladesSweets and confectioneryCakes, biscuits and filled pastries
Pickled vegetables
Soups and brothsFlavoured drinksBeer and malt drinks
Ready-to-eat savouriesQuestions about sodium potassium tartrate
Is potassium sodium tartrate harmful?
In 2020 EFSA set a group ADI of 240 mg/kg body weight per day, expressed as tartaric acid, for L(+)-tartaric acid and tartrates (E 334–E 337, E 354), replacing the earlier 30 mg/kg. In the exposure scenario EFSA judged most relevant, intake in the population groups did not exceed this ADI. When tartaric acid from other additives (E 353, E 472d, E 472e, E 472f) and from natural occurrence is added, the 95th-percentile intake in toddlers would exceed the ADI; EFSA did not consider this to indicate a possible health concern because the exposure was overestimated.
Is Potassium sodium L(+)-tartrate permitted in Vietnam?
Yes. Potassium sodium L(+)-tartrate (INS 337) is listed in Appendix 1 of Circular 24/2019/TT-BYT, the list of additives permitted in food.
Other acidity regulators
E334Tartaric acid (L(+)-)very lowE335Sodium tartratesvery lowE336Potassium tartratesvery lowE338Phosphoric acidlowE339Sodium phosphateslowE340Potassium phosphateslow
See all acidity regulators →Updated 21 October 2026
Sources (4)
- Open Food Facts additives taxonomy (Yenzo's table cites no EFSA opinion for this code). Open Food Facts additives taxonomy, https://github.com/openfoodfacts/openfoodfacts-server/blob/main/taxonomies/additives.txt (entry en:e337)
- Thông tư 24/2019/TT-BYT (văn bản hợp nhất 09/VBHN-BYT), Phụ lục 2A: nhóm thực phẩm được phép dùng INS 337
- EFSA Journal (2020). Re-evaluation of l(+)-tartaric acid (E 334), sodium tartrates (E 335), potassium tartrates (E 336), potassium sodium tartrate (E 337) and calcium tartrate (E 354) as food additives
- Regulation (EC) No 1333/2008 on food additives (consolidated text of 18.08.2026): Article 16 and Annex II, Part E, category 13.1 (foods for infants and young children)