When you say subsidy, I think of the Canadian government paying the insulin manufacturers the difference in price between what they charge individuals in the U.S. and what they charge individuals in Canada, to "make up" for what the insulin manufacturers would "lose" by selling in Canada. This isn't the case. All the government does is put a maximum price on how much the product can be sold for in Canada, they don't pay the manufacturers anything to "make up" for this lower price.
Each province in Canada does have a health care plan which covers some or all of the cost of certain medications for individuals. So if I were to walk in and buy a package of pen cartridges of 1500 units of Apidra, and pay the whole cost myself, it would cost about $60. But because I have provincial coverage, I only pay $16 for 1500 units. I have additional coverage through work, so really I only pay $3 per 1500 units of Apidra.
I've always thought it's insane when people from the U.S. post saying they pay hundreds of dollars for insulin. Same for Precision Xtra ketone strips—in the U.S. apparently they cost $80 for 10 strips, here they cost $18 for 10 strips.