We dye, paint, perfume, and spray with reckless abandon, but could our favorite beauty products be doing us more harm than good?  Dermatologist Jason R. Lupton weighs in with his list of the top six most dangerous ingredients. After reading this, you might want to start checking the labels of your favorite brands. 

1. Mineral-based makeup.

Tiny nanoparticles of materials are usually found in mineral-based makeup, which may be anything from foundation to blush to eye shadow. When the minerals are pulverized into nanoparticle size, they may have toxic properties which are especially concerning if inhaled or applied to damaged skin. Titanium dioxide appears to be among the most worrisome, as it could lead to the formation cell-damaging free radicals. If inhaled, these nanoparticles may infiltrate the lungs and intestinal walls as well.

2. Nail polish and hairspray.

Compounds known as phthalates are found in nail polish, hairspray, and even some perfumes and detergents. These chemicals have been linked to birth defects in mice and are completely banned in parts of Europe. They may also lead to infertility.

3. Dark Hair Dye.

The darker hair dyes have been linked to certain types of lymphomas (cancers), including non-Hodgkin's, Hodgkin's, and multiple myeloma. A study by Yale University researchers found that women who used brown, black, or red dyes at least eight times a year for 25 years had their cancer risks doubled. The risk didn't increase in those who had used lighter colors.

4. Antiperspirant.

Along with being associated with the development of Alzheimer's disease, the aluminum in many antiperspirant products may also be associated with breast cancer-especially when applied to freshly shaved skin.

5. Body Powder.

Talc is found in certain body powders, and it is thought that it may lead to cancer development. Numerous studies have shown a strong link between the use of talc in the genital area and ovarian cancer.

6. Lipstick.

Most lipsticks found in the United States contain toxic levels of lead that can build up in the body over time and may be linked to developmental defects, infertility, neurologic defects.

Other Dangers

What if you're extremely cautious and avoid all harsh and potentially dangerous chemicals? According to Dr. Nicolette Picerno, Denver's only double board certified female facial plastic surgeon, there are other potential risks that you need to be aware of.

"Many products that would be otherwise safe, become health risks when they are kept too long or improperly cared for and stored," Picerno says. "A variety of factors lead to the contamination of cosmetics—sunlight exposure, extreme heat or cold and sharing cosmetics are all health risks. Cosmetic products that have been misused or improperly stored can easily become contaminated. Once a product is contaminated, its composition has been compromised and it is no longer safe to use. The best way to store your makeup is in a cool, dry place—but never in the bathroom because the moisture will ruin the product."