L-Tryptophan
supplement ingredient
What is it?
L-Tryptophan is a supplement added for a specific benefit. Graded good: a real, recognisable ingredient that adds nutritional value, so it lifts a product’s score.
Other names on labels: tryptophan
At a glance
- Base score
- 1 (from −1 to 1; higher is better)
- Found in
- 41 products
Products containing l-tryptophan
Results reflect the latest label we hold for each product, not a live check of today's recipe. Open a product to see its source and last-checked date.
Common questions about l-tryptophan
Is L-Tryptophan good for dogs?
Yes, we grade it as a good ingredient: recognisable and nutritionally useful, so it lifts a product’s score. Bear in mind that no single ingredient decides quality; the whole recipe and its balance matter more.
What is L-Tryptophan in dog food?
L-Tryptophan is an essential amino acid, meaning dogs must obtain it from their diet. It is often added to pet foods because it serves as a building block for protein and certain brain chemicals. If you are considering it for a specific reason, speak to your vet first.
How many UK dog foods contain l-tryptophan?
41 UK products list l-tryptophan as an ingredient in our database. The full list is shown above, sorted by rating.
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What else is l-tryptophan called on labels?
Manufacturers can also list it as tryptophan. We match this to the same glossary entry when we read a label.
How does Open Dog Food grade l-tryptophan?
We grade it good, our highest grade, reserved for recognisable ingredients that add real nutritional value. Every ingredient is converted to its dry-matter share and scored from our glossary before a recipe gets its 1-100 rating; the full method is on our methodology page.