Nevermind, I just looked at that site and found the following:
The contaminated batch contained over 60 different bacterial contaminants, and many folks who were taking large doses of 4000 mg or more per day of the tainted product got sick, and some even died of the bacterial toxins. The FDA issued a voluntary recall of all L-Tryptophan, not knowing that the tainted material came from Showa Denko. In a well-intentioned move, the FDA then announced an import restriction on all tryptophan except for pharmaceutical-grade L-Tryptophan meant for baby formulas, intravenous-feeding solutions, animal use and prescribed medical uses. So in other words, L-Tryptophan was still legal to buy, but it had become almost impossible to find. Up to that time the US tryptophan market had totaled some $60,000,000 per year. It was just a few weeks after the import restrictions, though, when the depression patients, orthomolecular psychiatric patients, and chronic insomniacs really began missing their L-Tryptophan that Prozac was given a major public-relations and advertising push.