How do i make sure supplements are being absorbed?

Since starting the Immortal Regimen, i have cut out bread consumption almost completely. I might eat something that has wheat once every 2 weeks. My question is does bread really soak up or limit the supplements from being fully absorbed?

I want to make sure that whatever i am taking supplement wise is being completely absorbed, what are some things i can do to ensure that to happen? I usually take my supplements right after a meal with a spoon of coconut oil, how do i know that I'm getting the most from these supplements.

Thank You