in small doses
US /ɪn smɔl ˈdoʊ.sɪz/
UK /ɪn smɔl ˈdoʊ.sɪz/

1.
a little at a time; in small amounts
:
•
I can only handle his humor in small doses.
•
Learning a new language is best done in small doses every day.
a little at a time; in small amounts