Made my first glycerin tincture and it irritated my tounge and throat. First time I held a few drops under my tounge. The next time tried swalling some mixed in yogurt. Both had same result. The recipe was about 3/4 cup glycerin, 1/8 cup glycol, 20 drops mint oil, heated for a day in crockpot on warm. Everything was food grade. All was mixed with 11 grams ww which was grown myself, and mixed before in coconut oil and honey without issue. Never had any of the tincture ingredients before. Wondering which ingredient is most likely causing the irritation. I'm guessing the glycol and / or mint oil. Thoughts?