I found jelly babies fine for 10k. I have had a couple of gels on a couple of long runs, but at the end of the run because I’ve heard some people’s stomachs react to them in bad ways. I had no ill effects so will try mid run at some point.
Everyone is different and there are exceptions, but gels aren't really encouraged for runs under 90 minutes—they're just not necessary. Your body doesn't start to need extra glycogen etc until then, so you'd just be loading with unecessary stuff really. Gels are pretty gross too, I've started taking one with me on HM length races lately as a psychological boost, but there are much nicer ways to refuel! Flapjacks are good for burning on endurance runs, or liquid fuels (I like Tailwind), but again I'd personally not worry about these things for less than 15k.
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