Matcha contains L-theanine, which is associated with a more calm and alert mental state

Because matcha combines caffeine with L-theanine, the energy effect is often described as smoother than coffee, with less of a sharp spike.  

Matcha and green tea are rich in catechins such as EGCG, which have antioxidant activity

May help support focus, attention, and mental clarity throughout the day.

NCCIH notes that studies on green tea products showed a small reduction in total cholesterol and LDL cholesterol.

There is some evidence linking matcha and green tea compounds to metabolic support, but this is still an area where stronger human evidence is needed