CBD

CBD or Cannabidiol

CBD is non-psychoactive and balances the psychoactivity of THC
It is responsible for the majority of the body effects associated with marijuana. (i.e. the sedation, calming and relaxing effects, or "in the couch" feeling.)
Though CBD normally comes from marijuana, it can also be derived from Industrial Hemp. It is still CBD, the effects and benefits of it are not as strong as they are in the cannabis that one normally consumes.

Over the last few years, CBD has been on the rise with more studies being done and evidence pointing to it's ability in treating seizures both epileptic and non-epileptic.
One story that has been on the rise lately is Charlotte's Story, a young girl with debilitating epileptic seizures who has been taking CBD oil to reduce and calm her seizures.

Benefits and Effects of CBD

-Balances the psychoactivity of THC
-Anti-inflammatory
-Anticonvulsant (seizures)
-Antipsychotic (aids in bipolar and mood disorders)
-Antidepressant
-Antianxiety
-Reduces intraocular pressure (Glaucoma)
-Neuroprotective properties that suggest the slowing of neurodegenerative diseases
-Antiemetic/Reduces Nausea and vomiting
-Antioxidant
-Diabetes management: stabilizes glucose and insulin levels.

What makes CBD "nonpsychoactive"?

Everyone's body naturally has CB1 and CB2 (cannabinoid receptors) located throughout our brains and body. The CB1 receptors, which are found in the brain and central nervous system, bind with THC like a lock and key.

CBD on the other had does not fit into this receptor and doesn't act directly to activate or suppress the CB1 receptor. Let's say, if a strain has more CBD, it will loosely fit itself into a CB1 receptor and counteract the effects of the THC by supressing the CB1 activating qualities of THC. 

To put it short, "CBD opposes the action of THC at the CB1 receptor, thereby muting the psychoactive effects of THC." - Project CBD Co-Founder Martin Lee.