Paraben Free Shampoo
Parabens are chemicals used much of the time as preservatives. They are primarily used because of their ability to kill bacteria and fungus. Also, they do not cost much, either. Therefore, they are widely used in shampoos today.
However, they are becoming more and more controversial. They have been found in very low concentrations in breast cancer tumors. They also display the ability to weakly mimic estrogen, which is known to play a role in breast cancer development. At present, though, there has not been an established link between cancer and parabens.
Also, on a lesser note, parabens can cause skin irritation, contact dermatitis, and rosacea in people that have paraben allergies.
So in conclusion, there has not been an established link between the use of parabens and the growth of cancer or other diseases. However, there is a possibility of such a risk, which has been shown in scientific studies. It would be prudent to stay away from products that use these parabens, especially if there is a possible link to cancer.
Of course, true organic shampoo and conditioner don't contain parabens. However, make sure to check the ingredients. Some shampoo labels may say they are organic, but may only contain certain organic ingredients.