I have never drunk coffee. However, I do take a very very small dose of caffeine pills. The pills are 200mg but I break them into tiny pieces and micro dose around noon with last dose around 3pm. Some days I take 100mg total, other days I take 200mg total. Another thing I do is eat proper food at same time because otherwise I become jittery.

I also cycle off caffeine or taper the doses every few months when I am travelling.

My stomach is solid.

Does anyone know if the acidity is from coffee or caffeine itself?