Hidden glutamate sources
Hydrolyzed protein
Definition
What it is
Hydrolyzed protein: chemically processed protein releasing free glutamates and aspartates; a primary hidden MSG source used to qualify for 'No MSG' marketing claims.
On the label
Label names covered by this flag
- hydrolyzed protein
- hydrolyzed vegetable protein
- hydrolyzed soy protein
- hydrolyzed wheat protein
- hydrolyzed corn protein
- hvp
- hydrolyzed plant protein
- hydrolyzed pea protein
Regulation
Regulatory status
No bans or restrictions are recorded for this ingredient in the jurisdictions clearlabel tracks (US, EU, UK, Canada, Japan, Australia/NZ, Brazil).
Explainer
In plain language
Hydrolyzed protein is a protein source, often from soy, wheat, corn, or peas, that has been broken down into smaller pieces using acid or enzymes. This process releases free glutamates that add a savory, meaty taste known as umami, which is why it is used as a flavor enhancer rather than as a nutrition ingredient. It shows up widely in savory processed foods to deepen flavor.
Assessment
Why it is flagged
Hydrolyzed proteins release free glutamate, the same compound that gives monosodium glutamate (MSG) its effect. Because the glutamate here comes from hydrolyzed protein rather than added MSG, products using it can legally carry 'No MSG added' style claims while still delivering free glutamate. The FDA requires MSG to be declared when added directly, but treats naturally occurring free glutamate from ingredients like hydrolyzed protein differently. Large reviews have not established that dietary glutamate causes harm in the general population at normal intakes, and the older idea of a broad 'Chinese restaurant syndrome' has not held up well in controlled studies. Still, some people report headaches, flushing, or other symptoms they associate with glutamate-rich foods. Clear Label flags hydrolyzed protein so that hidden free-glutamate sources are visible and testable in your own logs.
In the aisle
Where it commonly shows up
- Bouillon cubes and soup bases
- Gravy and sauce mixes
- Flavored chips and savory snacks
- Canned soups and stews
- Processed and deli meats
- Seasoning blends and instant noodles
Practical
Reading the label
Look for 'hydrolyzed' followed by a protein name, such as hydrolyzed soy protein or hydrolyzed vegetable protein, sometimes abbreviated HVP. It often appears in products that advertise no added MSG, since it is a separate way to get free glutamate. Wheat-based versions matter to people avoiding gluten.
Alternatives
If you want to avoid it
Some people who want to limit added free glutamate choose products seasoned with herbs, spices, or simple salt instead, or foods with shorter ingredient lists. Cooking savory dishes from whole ingredients sidesteps flavor enhancers entirely.
FAQ
Common questions
Is hydrolyzed protein the same as MSG?
It is not the same additive, but it releases free glutamate, the same active component in MSG. That is why it can add a similar savory taste and why sensitive people track both.
Can a product with hydrolyzed protein say 'No MSG'?
Under FDA rules, a product cannot claim 'No MSG' or 'No added MSG' if it contains an ingredient that is a source of free glutamate, such as hydrolyzed protein. However, labeling in practice varies, so checking the ingredient list is more reliable than front-of-pack claims.
Does hydrolyzed protein contain gluten?
It depends on the source. Hydrolyzed wheat protein contains gluten, while hydrolyzed soy, corn, or pea protein does not, so the specific name on the label matters.
Citations
Sources
Citation
Primary reference
About this page: the definition, label names, severity, and regulatory chips come from the clearlabel ingredient taxonomy, the same data the scanner uses to score products. Research summaries describe associations reported in published studies, not diagnoses; individual responses vary. Scan any product with clearlabel to see which of its ingredients carry flags.