<<Disclaimer: Verify this information before applying it to your situation.>> Just spoke with someone regarding a product called Amazake. It's made by Grainaissance. Does anyone know about this product? Is it GF? The representative I spoke with does not know the gluten status. Ingredients: filtered water, organic brown rice, rice koji, xanthan gum. It's the koji I am concerned about. Thanks for any input!Stacye