造成多人死亡的来自中国的肝素被发现混入人工修饰的硫酸软骨素（oversulfated chondroitin sulfate）。此物比肝素便宜12倍,显然是为谋暴利故意添加的.俺不懂，国内销售的肝素难道就没有被污染了？或者秦人都很皮实，毒不死？

The contaminant, the regulators said, is a chemically altered form of chondroitin sulfate, a dietary supplement made from animal cartilage that is widely used to treat joint pain.

In its natural state, chondroitin sulfate does not have anticlotting properties. But it mimics heparin when altered to form what is called oversulfated chondroitin sulfate.

Some heparin producers in China also sell chondroitin sulfate, which can be derived from pig cartilage. Traders and producers say it is far cheaper than heparin, as little as one-twentieth the cost. That could be an enticement for counterfeiters, especially in the wake of a virulent pig virus that swept across China last year, substantially reducing the availability of the starting materials needed to make the active ingredient in heparin.