The contaminant has been linked to the deaths of more than 300 children in Africa and Asia
Earlier on Monday, a court in Myanmar found Suu Kyi, ousted in a Feb 1 coup, guilty of charges of incitement and breaching coronavirus restrictions, drawing international outrage at what some critics described as a "sham trial".
President Win Myint was sentenced to four years' detention, Myanmar's state-run broadcaster MRTV reported.
Both Suu Kyi and Win Myint will serve their sentences where they are currently being detained, an undisclosed location, suggesting they will not be sent to prison.