Are disodium 5-ribonucleotides vegan?

Disodium 5-ribonucleotides is a flavor enhancer composed of a mixture of disodium inosinate and disodium guanylate, commonly identified on ingredient lists by the additive code E635. This substance is produced commercially through chemical synthesis, yeast processing, or the microbial fermentation of carbohydrate sources. Food manufacturers use it synergistically with monosodium glutamate to create a savory umami taste in products like instant noodles, snack seasonings, flavored potato chips, sauces, soups, and ready-to-eat meals.

This ingredient is classified as possibly vegan because it can be derived from both plant and animal sources, and ingredient labels rarely disclose the origin. While disodium guanylate is almost exclusively produced via the bacterial fermentation of plant sugars or brewer yeast, disodium inosinate can be derived either from animal tissues such as meat and fish or from the bacterial fermentation of plant starches like tapioca. Because the specific manufacturing method is not indicated on the packaging, consumers must look for an official vegan certification or contact the manufacturer directly to confirm the source.