<<Disclaimer: Verify this information before applying it to your situation.>> << However, I tested 1/8 tsp of it [darifree] tonight, and I am experiencing a possible gluten reaction >> I just want to say that I am not affiliated with this company, but I have been very happy with the product. My son has been drinking Darifree for 12 months, and has never had the slightest reaction. He is horribly sensitive to even a minute trace of gluten (severe diarrhea within hours that lasts for days). Obviously, individuals vary. You need to decide for yourself. But since my son is allergic to soy, corn, egg, dairy, fruits, and nuts in addition to having a problem with gluten, I think that it is possible that there may have been something else that you ingested besides the Darifree that caused the reaction. Still, as with anything, wait a few days and try again. I have learned what my family can eat through "trial and terror"... The calcium in the Darifree has been a really important part of my son's nutritional package. Hope it works out for you. Please do let me know how this works out. Also, I'd like to hear from anyone else who's had a reaction. Karyn