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Quote from tanman99
I trust this source on a professional level. So take that as you will. Some good information in this article. []

tl;dr: elderberries showed some benefit of shortening symptoms of the flu in two studies and have shown to increase antibodies against the flu.

That being said always keep in mind supplements are not regulated by the FDA so manufacturers can basically put whatever they want to on the label. It's a good idea to look for the United States Pharmacopeia (USP) seal which means it was tested by an independent lab that certifies that what the manufacturer says is in the supplement is actually in there. But you're not really going to find that seal on any supplement like elderberry. It's more for simpler measurable supplements like thiamine or zinc or vitamin C etc. Assuming they did in good faith put elderberry in these supplements I'm not sure how effective they would be as those studies were done with a syrup and as far as I know making gummies involves heating which could very well denature the hemagglutinin protein that's thought to be the active ingredient in elderberries. That being said I still bought them and will give them to my 3rd grader with a hope and a prayer as I send her off to school.
Wow, I learn something new every day.