Why do you want to reduce caffeine intake? If we didn't take it in drinks such as coffee, tea and chocolate, it would be a 'miracle' supplement! Indeed, it is a constituent of many of our medications. Here is a link to an a 2017 paper available on PubMed summarising the benefits. pubmed.ncbi.nlm.nih.gov/28675917/ I also have a MEDSCAPE medical education paper entitled "More than just a hill of beans", which lists the following benefits based on epidemiological research: reduced all-cause mortality, reduced risk of diabetes, reduced risk of cardio-vascular disease, reduced risk of several cancers, reduced risk of liver, reduction of depression and suicidal thoughts, reduced risk of Parkinson's Disease and more! It is also an analgesic, hence the inclusion with various pain medications e.g. the "plus" in "paracetamol plus". Just stick to 3 - 4 cups a day, and limit use in the afternoon and evening.