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A lead compound? OK now I'd really have to think... Elemental lead is not as harmfull as lead phosphate, I think it was at Esperance port birds were dropping out of the sky from exposure, I personally know people with lead bullets in them from many years ago... Its very harmful for children, affects their learning, not so bad for adults.
Look at the chemical formula for a medication, often they're very complicated. they have a magnesium here or a whatever else there. Sometimes, like with lithium we dont actually know why it works at all, but we know it works.