Delta 9 is the most well-known and researched form of THC (tetrahydrocannabinol), which is the psychoactive compound found in cannabis that is responsible for the "high" feeling associated with marijuana use.

Delta 9 is the primary form of THC found in most strains of cannabis, and is typically responsible for the majority of the psychoactive effects.

Delta 9 can be consumed through smoking, vaporizing, or consuming edibles and can provide a range of therapeutic benefits such as pain relief, reduction of anxiety and depression symptoms, and can stimulate appetite.

Delta 9 can also interact with certain medications and can increase their effects, so it's important to speak with a healthcare professional before consuming it, especially if you are taking any medications.

There has been a lot of research on the potential medical benefits of delta 9, but more research is needed to fully understand its effects and potential therapeutic uses.

The legal status of Delta 9 THC varies greatly by country, state, and municipality, it's important to be aware of the laws and regulations in your area before consuming it.