This is the 2792nd most frequent French word.
concentre
Focused; concentrated.
The word 'concentre' in this sentence is a verb meaning 'concentrates' and conveys the act of focusing on an activity or task.
Il se concentre sur ses études pour réussir.
He concentrates on his studies to succeed.
Here, 'concentré' is an adjective describing the juice, meaning that it has been processed to increase its flavor or density by reducing in volume.
Un jus concentré a plus de goût.
A concentrated juice has more flavor.
The term 'concentrer' in this sentence is a reflexive verb meaning 'to concentrate,' used in the imperative mood to instruct someone to focus mentally.