Plans to give free sanitary products to all Rhondda Cynon Taf schools with pupils aged nine and above have been given the go-ahead.
A six-month trial will start this summer and it will be fully rolled out by April 2019.
The council cabinet's decision comes after a campaign led by Plaid Cymru and Rhondda Cynon Taf councillor Elyn Stephens to eradicate period poverty.
The Welsh Government had previously announced more than a million pounds worth of funding for tackling period poverty.
Councillors say period poverty can have an impact on pupils' education, with some missing school as a result.
It also a problem for women on low incomes, who may have to prioritise other products such as food.