When testing a new food, I always try it by itself first. I have a lot of allergies/intolerances, and this has been my most successful way of determining whether something is safe for me or not. If it is mixed with someting else, I have no way of knowing which ingredient caused any potential reaction symptoms.
So for the stevia, I tried 1 drop of the liquid on my tongue. And that is when I experienced the tongue swelling and icky bitter taste.
Chronic Lyme Disease, Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, Pancytopenia, chronic malabsorption/malnutrition, etc.; G-Tube; Currently TPN-dependent.
Meds: Zofran, Pulmicort, Heparin (to flush PICC line), Claritin, Colloidal Silver (used topically), IV Milk Thistle, probiotics.