Has anyone tried caffeine tablets?

Hi,

Has anyone tried caffeine tablets to help with energy and mental clarity?

I haven't tried it yet because we all know caffeine is addictive, but I'm getting a bit desperate. I found this article about the possible beneficial actions of caffeine for Covid - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8196824/ so I'm interested in hearing if anyone's tried it. Thanks!

Take care, Liz.