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Amino acids are dependent on minerals, vitamins and fatty acids for their developement and utilization. It really is best to assess your amino acid levels by serum testing (not urine) that way directed supplementation can be done rather than a hit or miss approach. This particularly holds true due to biochemical individuality which means needs are different for each person.
Anyhow this is a great article that explores the ability of threonine to bring healing to the gut and immune system.