<<Disclaimer: Verify this information before applying it to your situation.>> We use Tamari soy sauce here. The version we use is definitely GF (we bought it for that reason - it then took ages to find a use for it as it's sweet!). Ours is sold by a company called Meridian. You might have got away with it! Regards, David David J Walland University of Bristol Radiation Safety Officer [log in to unmask] Tel +44 (0)117 928 8323 Fax +44 (0)117 929 1209