The only time I ever had a problem with the SF jello, was when I made the recipe for gummie bears, it was about 3 packs of the jello, plus some plain gelatin and only about 1 cup (or maybe only 1/2 cup of water) - they didn't taste very good to me (but a lot of others seemed to really like them) and I got an excrutiating headache - I'm not sure if it was from the concentration of artificial sweetner, coloring or both.