Caffeine, stopped working?

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I used to be a total caffeine lover as the second I had a coffee or Diet Coke, or any amount of caffeine I’d feel incredible. I’d basically feel like the guy in the movie “Limitless”.

 

I’ve been having 1-2 cups every morning which would typically make me feel amazing, and lately it barely makes any difference.

 

Is there any reason it doesn’t give me an edge anymore? I tried doing zero and having it again, and still nothing. It’s like the receptors stopped working?

 

Anyone have a similar experience? What caused this? Anyway to get it to work again?

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I did zero today and will try to a cup tomorrow and see if it has any impact.