Butter coffee taste and effects? I have heard of people putting grass fed unsalted butter in their coffee and I have heard its pretty good. I was wondering if anyone has tried it and would like to describe the taste and how effective it was.
I do not know if this will be a good answer for you but here it goes.

When I lived in France (small rural community), I used to put grass fed unsalted butter into my coffee all the time. I got the idea from reading articles about Tibetans putting yak butter into their black tea.

Personally I enjoy it. It is an acquired taste because it is has a very rich and heavy flavor. Do not put milk or cream into your coffee as it will completely change your perspective on this great coffee idea. For myself, I prefer not to drink it just as it, safe the bottom of the barrel sort of speaking. I generally would dunk my rather dense bread (sometimes biscuits) into it at breakfast time and have enjoyed doing this as such for many years. 

For myself I only do this in the mornings.