I emailed the company last night about their soy sauce and here is their response.
Although we meet all sanitation guidelines in our facility that makes the HOUSE OF TSANG products, there could always be that possibility of cross contamination. We regret to inform you that we cannot guarantee there could not be.
Gina Lundberg Consumer Response Ref 829720
On Sep 4, 2002
Diappointing, but at least honest. I had called Kikoman a long time ago (1-2 years?) and I believe they did not make anything with peanut so we use their soy and teriyaki sauces. YOu might try them if available in your area.