The phrase "free amino" refers to an individual amino acid that is not tied to any other molecules. It is an amino acid that is not part of a larger protein structure. Full definition
What they wanted to look at was testing of free amino acids in type 2 diabetic patients to see if oral supplementation would affect these patients. (aminoacidinformation.com)
It is one of the most abundant free amino acids within plasma and muscles and is required for rapid cell division. (aminoacidstudies.org)
If we look further down the ingredient panel, we'll see the added free amino acids. (dogsnaturallymagazine.com)