Copper is a heavy metal and is needed for myelin development. [1-3] Surely too much of a good thing is bad. Often other heavy metals follow copper. A study out of Rhode Island USA correlated neurological health with placental heavy metal concentration. [4] A study out of Taiwan looked at heavy metals and phtalates in the urine of pregnant mothers. [5] Both studies correlated heavy metals with mental functioning of the children. Phtalates are used in the production of plastics. When an expecting mother has concerns about heavy metals in the town’s water supply she drinks more bottled water right? This post makes a weak attempt to explain the statistics used in the Rhode Island and Taiwan studies. The take home is that prenatal copper is likely a good thing. Phthalates are probably bad. You really need to discuss the issue with someone licensed to practice medicine.