I just came off a 14 month stretch of Keto and obviously wasn’t using the gels I had accumulated before I started. I found a box of SIS gels in the cabinet experation date of 6/18. Is there anything in the gels that break down and become dangerous? Is the date there mainly for taste or is there a good reason not to use these up first?
When I was racing ten years we had a “sponsorship” with some popular gel brand, which essentially meant we would get tons of boxes of gels that were about to reach their best-before date. We kept using them quite after that date and never had a problem…
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I had one that turned to a pure alcohol shot. REALLY messed w that race. It was waasay out of date. Others I threw away.
Couple months no big deal. longer… no thanks.
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Yeah the Exp. dates and Best Before dates aren’t the same. Though be safe, test one and don’t do what @dprimm did 
On Saturday, I consumed an SiS gel with a BB date of 07/17. No ill effects.
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I’ve had expired gels and chews with no issues.
However be cautious with expired bars. I opened some Probars that were past the expiry date and they were completely moldy.
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I found some old gu gels when was digging through some old cycling stuff a few days ago. I used on the trainer later that day. The date printed on them was July of 2016. They tasted ok and didn’t make me feel weird. I think you’ll be alright.
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Depends if it’s a use by or best before date marked on them. They mean different things
If it’s best before then should be ok.
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I find they’re just nice and crunchy a few years past their best.
Mmmm… crystallised sugar 
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Moldy bars are usually more about the package date than the bar date. Not sure about your case but the times I’ve found a moldy bar it’s usually been kicked around drawers and bags for a while. The packaging gets a small hole or tear in it and air can get in causing mold.
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I’m working through some currently with a date of Nov 13 on them, no issues (Science in Sport)
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Apparently cockroaches say gels are the only thing that will survice post nuclear war…and they should know 
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Same here with the chocolate outrage that had been left in the garage and then “found” they were 4 yrs old and rated great on my winter rides