I don't typically give my toddler supplements, but with preschool starting up I wanted some toddler zinc and vitamin D on hand. The first day of school she caught a cold, so I added this along with toddler vitamin D to her morning smoothies. Her cold was completely gone in a week. Typically she has colds for two weeks and they get pretty rough. We never went beyond a clear runny nose. Could've been a one off super easy going virus, but I will continue this regimen for the next cold for sure. …… Update: okay, I'm sold. Cold number 2 came in strong with a low-grade fever and total congestion. Something that would typically end in an Ear infection for sure. By day 3 or 4 we had a clear runny nose and by day 8, we were perfectly fine. Here's exactly what I give my 3yr old in case anyone else would like to try: In one Once upon a Farm smoothie (has over 100% daily requirement of vitamin C) I add 2-3 drops of this zinc. Some of these smoothies already have 35% zinc, so in those I only put 2 drops. I also add 2 drops of Nordic naturals baby vitamin D (800 IU) Then I give one Nordic Naturals toddler DHA/Omega-3 fish oil gummy (600 mg tropical punch flavor) Good luck