What Does E627 (Disodium Guanylate) Mean on a Food Label?

What the E627 Code Means on Your Food Label

When you scan an ingredient list and spot E627, you are looking at disodium guanylate — a potent flavour enhancer that boosts the savoury umami taste in processed foods. In the European and UK additive numbering system, E-numbers from E600 to E699 are reserved for flavour enhancers. E627 is the sodium salt of guanylic acid, a nucleotide that naturally gives dried shiitake mushrooms and bonito flakes their deep savoury character. Manufacturers produce it through fermentation, and on a label it signals that a small amount has been added to intensify the savoury profile of the product.

Why E627 Is Almost Always Paired with MSG

The key fact about E627 is its synergy with glutamate. On its own it has a mild umami effect, but when combined with monosodium glutamate (E621) the savoury impact multiplies dramatically. This is why you will nearly always see E627 listed right next to E621, or as part of the blend called disodium 5-ribonucleotides (E635), which mixes it with disodium inosinate (E631). This pairing lets manufacturers achieve a strong savoury taste using very small amounts of each ingredient, keeping production costs low while delivering the moreish flavour consumers expect.

Where You Typically Find E627

As a flavour enhancer, E627 is added to a wide range of savoury products. Common examples include:

• Crisps and snack foods — to intensify the moreish, savoury taste
• Stock cubes, soup mixes, and instant noodles — to deepen the broth flavour
• Sauces, dips, seasonings, and ready meals — to round out the overall savoury profile

Is E627 Natural or Artificial?

The compound occurs naturally in mushrooms, fish, and meats. The additive version is produced by fermentation, not synthetic chemistry, so it is often described as nature-identical. However, consumers should note that disodium guanylate can be derived from fish or other animal sources. Strict vegetarians and vegans may wish to contact the manufacturer to confirm the source, though fermentation-based and plant-based production is increasingly common across the EU and UK.

How Much E627 Is in Your Food?

EU and UK labelling rules require ingredients to be listed by weight, from most to least. Because E627 is so potent, it appears near the very end of the ingredient list. On the label it is usually written as flavour enhancer (disodium guanylate) or flavour enhancer: E627. The amounts used are tiny — typically well under 0.1% of the product weight — yet they deliver a noticeable savoury boost.

Should You Be Concerned About E627?

For the general population, no. The European Food Safety Authority (EFSA) re-evaluated ribonucleotide flavour enhancers in 2024 and concluded there is no safety concern at the levels currently used in food. The US Food and Drug Administration (FDA) also treats E627 as Generally Recognised As Safe (GRAS). However, one group may wish to exercise caution: people with gout. Disodium guanylate is broken down into purines, which raise uric acid levels in the body. If you have gout or are at risk, you may prefer to limit heavily seasoned processed foods. Additionally, products containing E627 are often high in salt, so check the sodium content if you are monitoring your intake.

In summary, E627 on a label means a small amount of a potent, naturally occurring flavour enhancer has been added — almost always alongside MSG — to deliver a rich, savoury umami taste. For most consumers, it is safe and simply indicates a product designed to be more flavourful.