这是令人共同担忧的问题，但研究发现，大多数的广泛使用的补充剂含有很少或根本没有汞、二恶英和多氯联苯的物质。
The concern is a common one, but studies have found that most of the widely available supplements contain little or no mercury, dioxins or PCBs.
有没有正在进行的评估硫柳汞替代性防腐剂相对有效性的研究？
Is there research ongoing to evaluate the relative effectiveness of alternative preservatives to thiomersal?
如果在生产过程中使用硫柳汞作为抗菌剂，然后在净化过程中清除该化学品，有些制品就可有微量硫柳汞。
Some products can have "traces" of thiomersal when the chemical is used during the production process as an antibacterial agent, which is later removed during the purification process.
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