Tartaric acid in food: ingestion safety
Low riskOral ingestion of tartaric acid at food and beverage concentrations is safe; the poor GI absorption and primary renal excretion of tartrate provides a built-in safety margin — most ingested tartaric acid passes through the GI tract without systemic exposure. GI absorption and metabolism: only ~15–20% of ingested tartaric acid is absorbed from the GI tract in humans (compared to >90% for citric or malic acid); the absorbed fraction is primarily renally excreted unchanged; colonic bacteria partially metabolize unabsorbed tartrate. Osmotic laxative effect at high doses: the large unabsorbed fraction of ingested tartaric acid exerts an osmotic effect in the colon — high intakes (multiple grams) cause dose-dependent loose stools or diarrhea; this limits the practical 'dose' achievable from dietary sources. Wine consumption and tartrate intake: wine drinkers who consume 1–2 glasses (150–300 mL) ingest 0.3–3 g tartaric acid — within the JECFA ADI of 30 mg/kg bw/day for a 70 kg adult (2100 mg/day); moderate wine consumption remains within the ADI for tartaric acid. Cream of tartar (KHC₄H₄O₆) ingestion: potassium bitartrate is water-soluble and dissociates to potassium and bitartrate ions; normal culinary use (1/4 tsp = ~1.2 g) provides negligible systemic exposure. Historical medical use: tartaric acid and its potassium salt (tartar emetic = antimony potassium tartrate, hq-c not relevant) have had pharmacological uses — the tartrate moiety itself is non-toxic; antimony tartrate toxicity is from the antimony, not the tartrate. Commercial scale: tartaric acid is primarily recovered from wine production byproducts (grape pomace, wine lees) — sustainable sourcing from winemaking waste makes it an environmentally favorable food acid.
What is tartaric acid?
The IUPAC name is (2R,3R)-2,3-dihydroxybutanedioic acid.
Also known as: (2R,3R)-2,3-dihydroxybutanedioic acid, L-tartaric acid, L-(+)-Tartaric acid, (2R,3R)-2,3-dihydroxysuccinic acid.
- IUPAC name
- (2R,3R)-2,3-dihydroxybutanedioic acid
- CAS number
- 87-69-4
- Molecular formula
- C4H6O6
- Molecular weight
- 150.09 g/mol
- SMILES
- C(C(C(=O)O)O)(C(=O)O)O
- PubChem CID
- 444305
Risk for people
Low riskOral ingestion of tartaric acid at food and beverage concentrations is safe; the poor GI absorption and primary renal excretion of tartrate provides a built-in safety margin — most ingested tartaric acid passes through the GI tract without systemic exposure. GI absorption and metabolism: only ~15–20% of ingested tartaric acid is absorbed from the GI tract in humans (compared to >90% for citric or malic acid); the absorbed fraction is primarily renally excreted unchanged; colonic bacteria partially metabolize unabsorbed tartrate. Osmotic laxative effect at high doses: the large unabsorbed fraction of ingested tartaric acid exerts an osmotic effect in the colon — high intakes (multiple grams) cause dose-dependent loose stools or diarrhea; this limits the practical 'dose' achievable from dietary sources. Wine consumption and tartrate intake: wine drinkers who consume 1–2 glasses (150–300 mL) ingest 0.3–3 g tartaric acid — within the JECFA ADI of 30 mg/kg bw/day for a 70 kg adult (2100 mg/day); moderate wine consumption remains within the ADI for tartaric acid. Cream of tartar (KHC₄H₄O₆) ingestion: potassium bitartrate is water-soluble and dissociates to potassium and bitartrate ions; normal culinary use (1/4 tsp = ~1.2 g) provides negligible systemic exposure. Historical medical use: tartaric acid and its potassium salt (tartar emetic = antimony potassium tartrate, hq-c not relevant) have had pharmacological uses — the tartrate moiety itself is non-toxic; antimony tartrate toxicity is from the antimony, not the tartrate. Commercial scale: tartaric acid is primarily recovered from wine production byproducts (grape pomace, wine lees) — sustainable sourcing from winemaking waste makes it an environmentally favorable food acid.
Regulatory consensus
2 regulatory and scientific bodies have classified Tartaric acid. The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| EPA CTX / Genetox | — | Genotoxicity: positive (Ames: positive, 6 positive / 3 negative reports) | |
| EPA CTX / Genetox | — | Genotoxicity: positive (Ames: positive, 6 positive / 3 negative reports) |
Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.
Where you encounter tartaric acid
- Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
- Occupational Environments — Factories, Warehouses, Transportation vehicles
- Food — processed food, beverages, candy, baked goods
-
Fragrance
— perfume, cologne, scented personal care products, household fragrance products, candles
Identified in Fragrance Ingredient Safety Priority Research database (2,325 ingredients)
Safer alternatives
Lower-risk approaches that achieve a similar outcome to Tartaric acid:
-
Fragrance-free formulations
Trade-offs: Consumer preference for scented productsRelative cost: Lower (ingredient elimination)
-
Essential oil-based fragrances (with disclosure)
Trade-offs: Natural does not mean safe — many essential oils are skin sensitizersRelative cost: 2-5× conventional
Frequently asked questions
Is tartaric acid safe for you?
Oral ingestion of tartaric acid at food and beverage concentrations is safe; the poor GI absorption and primary renal excretion of tartrate provides a built-in safety margin — most ingested tartaric acid passes through the GI tract without systemic exposure. GI absorption and metabolism: only ~15–20% of ingested tartaric acid is absorbed from the GI tract in humans (compared to >90% for citric or malic acid); the absorbed fraction is primarily renally excreted unchanged; colonic bacteria partially metabolize unabsorbed tartrate. Osmotic laxative effect at high doses: the large unabsorbed fraction of ingested tartaric acid exerts an osmotic effect in the colon — high intakes (multiple grams) cause dose-dependent loose stools or diarrhea; this limits the practical 'dose' achievable from dietary sources. Wine consumption and tartrate intake: wine drinkers who consume 1–2 glasses (150–300 mL) ingest 0.3–3 g tartaric acid — within the JECFA ADI of 30 mg/kg bw/day for a 70 kg adult (2100 mg/day); moderate wine consumption remains within the ADI for tartaric acid. Cream of tartar (KHC₄H₄O₆) ingestion: potassium bitartrate is water-soluble and dissociates to potassium and bitartrate ions; normal culinary use (1/4 tsp = ~1.2 g) provides negligible systemic exposure. Historical medical use: tartaric acid and its potassium salt (tartar emetic = antimony potassium tartrate, hq-c not relevant) have had pharmacological uses — the tartrate moiety itself is non-toxic; antimony tartrate toxicity is from the antimony, not the tartrate. Commercial scale: tartaric acid is primarily recovered from wine production byproducts (grape pomace, wine lees) — sustainable sourcing from winemaking waste makes it an environmentally favorable food acid.
What products contain tartaric acid?
Tartaric acid appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments); processed food (Food).
See Tartaric acid in the food app
Look up products containing tartaric acid, compare to alternatives, and explore the full data record.
Open in food View raw API dataSources (2)
- FDA GRAS: Tartaric Acid (E334) — winemaking dominant acid; cream of tartar; GRAS acidulant; ADI 30 mg/kg; 15-20% GI absorption; renal excretion; sour candy; grape juice natural source (2021) (2021) — regulatory
- EFSA ANS Panel: Re-evaluation of Tartaric Acid (E 334) — ADI 30 mg/kg bw/day; osmotic laxative high dose; wine pH buffering; potassium bitartrate; grape pomace recovery; dental erosion; renal excretion biomarker (2020) (2020) — regulatory
Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →