A metabolizer is a term used to describe something that helps break down or process substances within living organisms, such as people or animals. Full definition
; — RRB - And with that, I was having more coffee because I found that my body could tolerate it well — even though I'm a fast caffeine metabolizer. (mindbodygreen.com)
I have a genetic mutation that makes me a fast metabolizer of caffeine — coffee brings me joy! (mindbodygreen.com)
Of course, there are potential downsides, especially if you're a slow metabolizer of caffeine. (cathe.com)