E367 (Calcium fumarate)

E367 is calcium fumarate, the calcium salt of fumaric acid. This additive is rare and in many modern ingredient lists belongs more to historical reference entries than to mass-market foods. If it appears, its role is connected with acidity regulation, buffering and a possible mineral component. The word calcium in the name does not automatically mean that the product is a good calcium source. A meaningful conclusion requires a declared mineral dose per serving and the full formula.

What calcium fumarate is

Fumaric acid is an organic acid, and its salts are called fumarates. In E367, the fumarate part is bound with calcium. This salt differs from free fumaric acid. It may affect acidity more gently, participate in a buffering system and behave differently in terms of solubility.

The word fumarate also appears in biochemistry because fumarate participates in the Krebs cycle. But food calcium fumarate in a technical mixture is not the same as a metabolic supplement and does not promise energy support. In ordinary foods, its meaning is determined by pH, flavor, stability and dose, not by an attractive biochemical association.

Why the additive is rare

Modern food technology usually regulates acidity with more familiar substances: citric, malic, lactic and fumaric acids, citrates, malates, phosphates and tartrates. Calcium fumarate is much less common. This may be related to its limited technical niche, solubility, regulatory lists and the fact that other salts are more convenient in mass formulas.

Rarity does not automatically mean danger. It does mean that if E367 appears, the product deserves closer reading: where it was made, whether the label is current, what category it belongs to and what other acids, salts, sugars or fillers are listed nearby. Sometimes an unusual E-number reflects an old or imported labeling format rather than a special risk.

Acidity and technical role

Calcium fumarate may participate in acidity control. In acidic mixes, pH affects taste, stability, solubility, flavoring performance and interaction with other salts. The calcium salt may provide gentler buffering than the free acid and help a product behave more predictably.

This role is possible in technical mixes, powders, beverage systems or rare food applications. E367 is not a universal stabilizer and does not fix a weak formula. If the product contains a lot of sugar, colors, flavorings, cheap fillers or starch, calcium fumarate does not change the overall assessment.

Calcium and nutritional meaning

Calcium is needed for bones, teeth, muscles, nerve signaling and blood clotting. But not every calcium salt on a label is a meaningful calcium supplement. If a product is truly calcium-fortified, the manufacturer usually declares the amount of the mineral. Without that number, E367 is better read as a technical component rather than a calcium source.

When choosing calcium supplements, form, dose, vitamin D, magnesium, digestive tolerance, kidney health and the whole diet matter. A trace of calcium fumarate in a rare technical mix and a capsule or powder with a calculated calcium dose are different things. The mineral meaning of E367 should therefore not be exaggerated.

Low-carb relevance

E367 is not sugar, flour or starch. By itself it does not add meaningful carbohydrates. But the product containing it may be a sour powder, drink, dessert, technical mix or imported supplement. For keto and LCHF, carbohydrates per serving, sugar, syrups, maltodextrin, starch and fruit concentrates matter.

A sour taste does not prove low sugar. Acidity can make a sweet product taste fresher and less cloying, but it does not reduce carbohydrates. If the product is labeled sugar-free, sweeteners, polyols and tolerance still matter. Calcium fumarate is usually secondary in that assessment.

Limits and label reading

Caution with calcium salts is relevant in calcium metabolism disorders, a tendency to kidney stones, chronic kidney disease and high-dose calcium supplementation. In ordinary trace amounts, E367 is usually not the main factor, but with medical limits the total mineral load deserves attention.

The practical conclusion is contextual. E367 should be read as a rare calcium salt of fumaric acid. It may regulate acidity and participate in technical stability, but it is not a guaranteed calcium source and does not make a product beneficial. Real product choice depends on category, carbohydrates, mineral dose, acid exposure and the full ingredient list.