Why does Caffeine hold no effect on me?

I could even have resembling 500 mg in pill form and I don't surface any energy boost. Is this everyday? Why am I immune to its effect (no I don't use it regularly so itsa not a tolerance thing). Could this be a sign of A.D.D. or Asperger's or something?Why does Caffeine hold no effect on me?
You liekly have a totally efficient liver or express metabolism
You may have developed an imperviousness over time. It might be having other effects on you that you aren't aware of.
Unless you are approaching that with medication and medicines, it is probably only your body needs more caffeine over time if you steal in seriously on a daily proof.