Full spectrum CBD oil is a type of CBD oil that contains all the naturally occurring compounds found in the hemp plant. This includes not only CBD, but also other cannabinoids such as THC, CBG, and CBN, as well as terpenes, flavonoids, and other plant compounds. This combination of compounds is believed to offer greater therapeutic benefits than CBD on its own.

One of the reasons best full spectrum CBD oil has become so popular is because of the entourage effect. This is the idea that the various compounds in the hemp plant work together in synergy to enhance the therapeutic properties of each other. The theory is that by using the whole plant, rather than isolating a single compound, the effects of CBD are amplified.

Some research has suggested that full spectrum CBD oil may be more effective for certain conditions than CBD isolate, which is pure CBD. For example, a 2015 study found that full spectrum CBD oil was more effective in treating inflammation than CBD isolate. Another study published in 2018 found that full spectrum CBD oil was more effective in reducing seizures in children with epilepsy than CBD isolate.

However, it's important to note that full spectrum CBD oil does contain trace amounts of THC, the psychoactive compound in cannabis. While the amount of THC is typically less than 0.3%, it can still show up on a drug test and may cause psychoactive effects in some individuals. 

Therefore, it's important to use caution when using full spectrum CBD oil and to consult with a healthcare professional before use. Full spectrum CBD oil is a type of CBD oil that contains a variety of compounds found in the hemp plant, including CBD, other cannabinoids, terpenes, and flavonoids.