Here is the link to the US postal service country listings pe.usps.com/text/imm/immctry.htm index of countries. Just look up Canada and look at the prohibitions and restrictions.
The key to international shipping is how things are packaged and what gets put on the declarations. Many businesses don't want to trouble with this or don't know how to do it to help the customer. It is best to have a friend or private party who knows what to do and many things can be safely sent.
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MMS (Master Mineral Solution) is Sodium Chlorite 28% (22.4% Sodium Chlorite, 5.6% Inert Salts and the remainder water) plus an acidic activator (usually 50% Citric Acid or 4% Hydrochloric Acid) when combined produces Chlorine Dioxide.