1-Ureas

Ureas are preservatives that have the potential to release formaldehyde in very small amounts and are a primary cause of contact dermatitis. 
Formally known as diazolidinyl urea, imidazolidinyl urea, or DMDM hydantoin and sodium hydroxymethylglycinate

2-Parabens

Parabens, found in breast cancer tissue, are a suspected carcinogen.
The particular parbens were found in relative concentrations that closely parallel their use in the synthesis of cosmetic products." 
Many manufacturers argue the jury is still out on this chemical, but--do you really want to risk it?

3-Synthetic Fragrances

Since they are considered secret, guess what, none of the at times hundreds of chemicals in a fragrance are actually listed on that bottle. 
Fragrances can contain neurotoxinsand are among the top five allergens in the world," reports Cosmetics Database.

4-Phthalates

Male reproductive development is acutely sensitive to some phthalates.
Banned from personal care products in Europe!
 About a billion pounds per year are still produced and sold worldwide.

5-Petrochemicals

These are derived from crude oil. Petroleum-based ingredients such as petrolatum, mineral oil, and paraffin (derived from nonrenewable sources)
Tend to form a barrier when applied to the skin that does not allow it to breathe and can clog pores. 

6-Chemical Sunscreens

Chemical sunscreens, such as oxybenzone and octylmethoxycinnamate, have been shown to disrupt endocrine activity. Titanium dioxide and zinc oxide are safer alternatives. 

7-Propylene Glycol

This cosmetic form of mineral oil is commonly found in skin and personal care products. It is an eye irritant, experimental teratogen, has dangerous reproductive effects and is ingestible poison. 
Also commonly used in cleaning products

8-Sodium Lauryl Sulphate(SLS)

Used as a surfactant (foaming agent) in body washes, bubble baths, foaming cleansers, cream cleansers, shampoos and toothpaste it is a common skin irritant and is rapidly absorbed and retained in the eyes, brain, heart and liver.

9-Synthetic Colors

Synthetic colors are made from coal tar. 
They contain heavy metal salts that may deposit toxins onto the skin, causing skin sensitivity and irritation.
Animal studies have shown almost all of them to be carcinogenic. 
They will be labeled as FD&C or D&C, followed by a color and a number. 

10-Nanos

Nanos are a new technology with inconclusive but potentially hazardous study results. 
Research suggests that when tiny nano particles penetrates the skin, they may cause cell damage.