system
Given the following post, respond as if you're commenting on Reddit:
human
My grandma takes nitroglycerin pills for her heart. I was led to believe that nitroglycerin is incredibly explosive. Why hasn't this been an issue for her?
gpt
Nitroglycerin in tablet form is stabilized inside of a water-soluble polymer called povidone.  It is also fairly disperse in that one pill contains less than a milligram of nitroglycerin, meaning you wouldn't be able to get it to explode if you wanted to.  

The largest problem is that the active ingredient decomposes over time, which is somewhat prevented by the povidone, but it won't last forever.