L-Tryptophan is an essential amino acid (protein building block) in human nutrition. Essential amino acids are not synthesized by the body and must be obtained in the diet. The L-tryptophan in this product is manufactured and tested for purity according to United States Pharmacopeia (USP) standards.
What is Ajinomoto TryptoPure?
TryptoPure is pure, pharmaceutical-grade L-tryptophan produced by the world's
leading maker of amino acids—Ajinomoto. The global leader in the research,
production, and sales of amino acids, Ajinomoto was one of the first to make
pharmaceutical-grade amino acids; they literally invented the process.
Ajinomoto TryptoPure is considered the purest, most trusted L-tryptophan
available. It is manufactured via fermentation strictly from vegetable sources,
not animal, and it is between 99% and 100% pure. The level of impurities in
tryptophan from other makers can be much higher.
In fact, from 1989 to 2006 the FDA was so concerned about the quality of
tryptophan coming into the U.S., that it instituted an import ban with one
exception: Ajinomoto's TryptoPure. In 1989, the importation of L-tryptophan was
banned in the United States after cases of an autoimmune illness called
eosinophilia-myalgia syndrome were traced to an improperly prepared batch of
tryptophan. The FDA limited L-tryptophan availability to prescription drugs,
infant formulas, and enteral feeding products. Because the FDA recognized the
unsurpassed quality Ajinomoto’s TryptoPure, it was excepted from the ban, but
its use was limited to those few products. Today, it is available
over-the-counter in Doctor’s Best L-Tryptophan products.
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