Bests & Worsts Reviews from Amazon

There may be some Birch mixed in, but back of bag clearly states made from corn in USA, "not made from corn in China, but the United States, where it is strictly regulated by the FDA" (see back of back pic). Amazon description says 100% Birch which it is not. Corn cob xylitol is much more sustainable than xylitol from wood. The price on this should be a red flag. Too inexpensive for Birch xylitol. Also note, most corn is USA is GMO corn. Do your research before purchasing.