yes cbd is very good for you and usually zero to 1% thc. normal strains have 10-25% thc and the concentrates go as high as you want. usually around 50% and thats a clear very high head high. cbd became famous because of little girl that curbed her vicious epilepsy the strain is called Charlottes web and its super high in cbd

http://www.leafly.com/sativa/charlottes-web

https://www.youtube.com/watch?v=CiShwotFJR8