In short, CBD oils made from hemp must contain less than 0.3% THC – this is below the legal federal limit (and is why many CBD oil companies claim to be able to ‘legally ship to all 50 U.S. states’). In contrast, cannabis CBD oils (that you’d find in places like medical marijuana dispensaries) may have a much higher THC content, given that they are made from marijuana rather than hemp.
Best CBD on Amazon. Currently, Amazon states they do not allow the sale of CBD products on their platform, as it is listed as a prohibited product. However, there are plenty hemp derived CBD oils on Amazon to choose from, many show casing their ability to relieve symptoms of pain, anxiety, sleep and depression. The health benefits of cannabis derived CBD oils tend to surpass those of hemp derived CBD oils, as the oils are derived from different parts of the hemp plant. Even so, the derived CBD is virtually the same and provides an array of benefits.
The most commonly used form of CBD is CBD oil. Combining CBD extract with a carrier oil like coconut oil, it can be ingested or vaped, bringing a lot of variety. But because marijuana legalization is in such a murky situation with both federal and state laws to grapple with, CBD oil's legality can be hard to parse depending on where you are. Let's start with legality at the federal level.
This is good news for the best CBD oil companies because the Farm Bill allows for the legal cultivation of industrial hemp, under certain circumstances, which can be a source of CBD. But CBD can also come from non-industrial hemp, namely the marijuana plant that most are more familiar with. Therefore, whether or not CBD oil for pain is legal can be a question of which “version” of the cannabis plant it was sourced from. If it was sourced from industrial hemp, (which contains less than 0.3% THC by volume), and it was cultivated under the Farm Bill, then it is legal.
Generalized pain, for instance, has dozens upon dozens of high profile research and clinical studies that have been carried out in universities and laboratories around the globe. One of the most well-publicized of these studies took place back in 2008, in which results determined that “cannabinoid analgesics (pain relievers) have generally been well tolerated in clinical trials … with acceptable adverse event profiles (meaning acceptable effectiveness for practical use).

Though reviews are mixed, the majority of reviewers have reported positive experiences, mainly in regard to sleeplessness and stress. Other positive reviewers have cited assistance with muscle tension and pain. One reviewer stated that following prolonged use, the need for anti-inflammatory medication was eliminated. Surprisingly, the majority of negative reviews cite an unfavorable taste more often than decreased effects. Other negative amazon reviews site problems with shipping, and disappointment that the product is not a full spectrum hemp oil containing CBD.
Once the plants are harvested, the next step is to extract the CBD. One commonly used method is alcohol extraction, where the plant is soaked in a grain alcohol solvent. After it is soaked, the liquid that remains is high in CBD. The solvent is then evaporated and voila! You are left with potent CBD oil. CO2 extraction is another common method, but it is much more complex. 
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