Well, he PM'd me a link to a certificate of analysis:
http://www.essentialdepot.com/msds/coa glycerin kosher food.pdf
I'm linking it here because I think it is important to keep this conversation public and ongoing.
Now I see where his confusion is, but I can't say I'd be concerned with <1ppm heavy metals. If they couldn't be specific, they didn't pay for a test sensitive enough to detect exact levels. Also, keeping in mind that (roughly) 1 ppm = 1mg/L. That's equivalent to a few drops in a 121L drum. Common food items, such as fish, rice, potatoes, wine, beer, etc., have higher concentrations. For example, the average American ingests about 50mg of arsenic per day from food items. Look at a water analysis for any big city (like GTA), its quite amazing the chemicals/compounds found in drinking water.
Anyway, I guess the bottom line is everything carries risk, and environmental exposure to various chemicals and compounds not healthy to humans is a everyday occurrence. There are acceptable limits set by the WHO and HC, and one must make a determination for themselves whether or not they're willing to take the risk.