Taurine doses are up to 3g/day: Each has 1g, so that's not a problem.
Theanine doses are up to 1g/day: Each has 250mg, so that's not a problem,
Citicoline dose is up to 1g/day: Each has 250mg, so that's unlikely to be a problem.

Typically caffeine upper recommended is 400mg: Each gel has 200mg / serving, so that could be a problem.
How much caffeine are you normally taking? 2 servings = 400mg = 5 Redbulls

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Depends on your sensitivity within reason. I've regularly supplemented with 5+g of taurine and will have 400mg of caffeine in my drink mix for a sprint tri. Consider your weight in all of this and how you respond to things like caffeine but it shouldn't be a big deal given the ingredient amounts listed above to have more than one.