Its distribution in the body is unaffected by the inhibitory effects that kava can give. So, no it doesn't cause caffeine to absorb slower, just be excreted slower.
Could it be that the effects of caffeine are starting to get to a level that's causing you agitation?
If you have coffee withdrawal then it is very simple. If the headache starts, drink a small coffee (not an elephant's bucket). Ifbit is psychological, you can go decaf route. Decaf worked for me very well.
Research suggests that coffee works on the opiate receptors (antagonism) so maybe that is having a funny interaction with kava? Just longshot speculation... But there's a reason why coffee feels so much different than synthetic caffeine.
Research suggests that coffee works on the opiate receptors (antagonism) so maybe that is having a funny interaction with kava? Just longshot speculation... But there's a reason why coffee feels so much different than synthetic caffeine.