There are several drugs on the market whose overall safety may not be fully known. Drug safety monitoring is important in identifying previously unknown side effects. This activity is not exclusive to drugs, but also applies to natural health products. Patient awareness of product safety is a major concern in Canada. Only about 5% of side effects experienced by Canadians are reported every year. This could be a danger to public health. Agencies, such as Health Canada, have specific rules in ensuring product safety.