We found chemicals in these products that are associated with cancer, reproductive harm, and also birth defects. >> A style often deemed as protective for black women is now under scrutiny as two new studies warn of health risks in hair extensions. Consumer Reports revealing new findings that human, synthetic, and plant-based hair extensions from 30 brands have volatile organic compounds or heavy metals like lead.Human hair by far had the most lead that we've ever seen in testing these products. Orders of m ...