The province is trying to stop three paid blood plasma donor clinics from opening their doors in Ontario. Health Minister Deb Matthews has written a letter to her federal counterpart, calling "paid donors" a potential concern for those who volunteer to give blood.

Two of these clinics are planned for Toronto, one at Spadina and College, the other at Adelaide and Church. Both are close to missions and shelters - the Scott Mission on Spadina and the Salvation Army Gateway Drop-In on Jarvis.

Canadian Plasma Resources explains on its Website that it pays donors by direct deposit, cheque or pre-paid credit cards.

Health Canada hasn't approved these paid clinics, which is why Matthews says she's reaching out to Ottawa.

The third clinic is being proposed for Hamilton.