Perhaps one of the greatest resources in making the switch to a green life (besides us of course) is the Environmental Working Group (EWG). "The Environmental Working Group is an American environmental organization that specializes in research and advocacy in the areas of toxic chemicals, agricultural subsidies, public lands, and corporate accountability". That's the official definition, but to me it's so much more. When I am researching new companies, specifically things that I apply to myself (lotions, soaps, sunscreens etc) I always check the EWG. They offer a database of over 66,770 products that have been tested. Products that meet their requirements are verified with a symbol. When searching products you are looking for products that have a rating of 1 or 2 (a green rating). The ratings go up to 10 but 10 have ingredients with great concern. To read more about the ratings and what they test, visit their about section.
You will often see me refer to the EWG rating if something I am posting about is applied to your skin. I don't tend to post anything that is not a 1 or 2 because I feel those products may cause some harm. That being said, there are some companies who have products in the green category but also have products in the yellow and red categories. Always refer to the EWG when looking into the safety of an applied skin product.
In addition to the database the EWG offers various articles on clean and healthy living, such as the dirty dozen and clean fifteen lists and consumer guides. Book mark the page, you will find yourself visiting it on many occasions. It is a trusted and well researched resource available to you.