Interesting reading about Zinc Oxide:
A study in Biomedical and Environmental
Services claims that zinc oxide is the most toxic nanoparticle
compared to titanium dioxide, silicon dioxide, and aluminum oxide.
X.Q. Zhang and other researchers from the Southeast University in
Nanjing, China conducted the study and found all tested all of the four
above mentioned nanoparticles caused cellular mitochondrial
dysfunctions, morphological modification and even apoptosis in human
fetal lung fibroblasts. It was dose dependent, meaning that high high
concentrations were related to high toxicity.
Compared with the other three types, zinc oxide was the most dangerous
and toxic, according to the study. Zinc oxide, titanium dioxide, silicon dioxide, and aluminum
dioxide are all used in processed foods and many dietary supplements.
Zinc and titanium dioxides were the most commonly used, especially in
sunscreen and cosmetic products dealing with the skin.