CBT has emerged as a common treatment for concerns regarding moods. It has become increasingly popular for reasons such as its defined structure and that it is based on common sense. Research shows that CBT is the most effective form of treatment for those coping with depression and anxiety. CBT alone is 50-75% effective for overcoming depression and anxiety after 5 – 15 modules. Medication alone is effective, however, science still does not understand the long-term effects on the brain and body. There is evidence which suggests that CBT may be more cost-efficient in the long run in comparison to medication. Although, a combination of medication and CBT seems to be the most effective in overcoming mental illness. In particular, antidepressants paired with CBT could reduce potential relapses in patients facing depression.