Due to the large number of calls we receive on our L-Tryptophan, we hope to answer some of the questions you may have on our product.

Our material meets USP 29 standards, and is manufactured for us by one manufacturer to our specifications. We are the only company in the U.S. that sells this raw material under an exclusive contract with the manufacturer. HPLC testing is done for quality and safety by an independent laboratory prior to shipping. Upon receipt of the raw material, we again run HPLC tests thru independent laboratories. In addition, testing is run for Peak E by HPLC, Melamine, Endotoxins, Aerobic Plate Count, Coliform, E. coli, Yeast and Mold, Salmonella, Mercury, Lead, Cadmium, Arsenic, Aluminum and Total Heavy Metals. All of our testing is provided by independent laboratories for quality assurance.

Please contact our customer support for more information. (800-952-7921)

Please see an example of our typical C of A below.

Item	Specification	Results
Specific Rotation @ 20C	-29.4 ~ -32.8	-30.8
pH	5.5 ~ 7.0	5.8
State of solution	>95.0%	96.0%
Chloride (Cl)	<0.05%	<0.020%
Ammonium (NH4)	<0.020%	<0.020%
Sulfate (SO4)	<0.03%	<0.020%
Iron (Fe)	<0.003%	<0.002%
Total Heavy Metals	<15ppm	<10ppm
Arsenic (As203)	<1ppm	<1ppm
Foreign amino acids	<0.5%	<0.5%
Loss on drying	<.30%	0.01%
Residue on ignition	<0.10%	0.01%
Organic volatile impurities	Meets the requirements	Meets the requirements
Assay titration	100.0 ~ 98.5%	99.5%
Assay HPLC	>98.5%	99.6%
EBT (Peak E) by HPLC	_	ND (<10ppm)
Endotoxin	_	Less than 6.0 EU/g
Yeast and mold	_	Less than 10 CFU/g
Coliform	_	Less than 10 CFU/g
Aerobic plate count	_	200 CFU/g
Salmonella	_	Negative per 5 grams
E. coli	_	Less than 10 CFU/g
Melamine (GC/MS)	_	ND (<1.0ppm)