CBD (cannabidiol) is the second most abundant cannabinoid in cannabis, after THC (tetrahydrocannabinol).[4] Unlike THC, CBD won’t get you high; it’s typically used medicinally, not recreationally, with the four most commonly targeted conditions being pain, anxiety, depression, and sleep disorders.
What is CBD?
What are CBD’s main benefits?
Human research on CBD has focused on two rare forms of epilepsy: Dravet syndrome and Lennox-Gastaut syndrome.[5] In humans and animals, CBD has shown promise as a treatment for a wide variety of ailments, notably anxiety,[6][7][8][9][10] depression,[8] pain,[11][12][13][14] inflammation,[15][16] and cancer.[17]
Unlike cannabis and THC, CBD doesn’t impair coordination, judgment, or memory.[18] In a Critical Review Report published in 2018, the World Health Organization concluded that there was “no evidence of recreational use of CBD or any public health-related problems associated with the use of pure CBD".
What are CBD’s main drawbacks?
CBD’s adverse effects are usually minor, but they include lethargy, fatigue, sleepiness, fever, diarrhea, vomiting, decreased appetite, and increased levels of alanine aminotransferase (a marker of liver damage).[19][20][21]
Other drawbacks include a paucity of human evidence, the unreliability of most CBD products on the market, and the “gray area” legality of CBD products.
How does CBD work?
CBD works in myriad ways, which are still being explored. For instance, it may reduce pain and stress via the TRPV1 receptor,[22][23][24] stress and depression via the 5HTI-alpha receptor,[25][26] and inflammation via the A2A receptors.[27]
Unfortunately, CBD seems to work better in combination with THC.
What are other names for Cannabidiol (CBD)?
Note that Cannabidiol (CBD) is also known as:
- Cannabidiol
- Epidiolex
- CBD
Cannabidiol (CBD) should not be confused with:
- THC
- Cannabis
- Sativex
Dosage information
The only CBD product approved in the U.S. is an epileptic drug: Epidiolex® is a solution (100 mg of CBD per milliliter) taken orally, preferably with food. The starting dosage is 2.5 mg per kilogram of body weight twice per day (so 5 mg/kg/day). The maximum dosage is 10 mg/kg twice per day (so 20 mg/kg/day). In people with hepatic impairment, the dosage is reduced.
Since (i) dosages in studies are all over the place, (ii) a CBD product’s label will very often overstate or understate this product’s CBD content,[1][2] and (iii) high-fat and high-calorie meals can greatly increase CBD absorption,[3] properly dosing CBD products is very, very difficult.
Frequently asked questions
What is CBD?
What are CBD’s main benefits?
Human research on CBD has focused on two rare forms of epilepsy: Dravet syndrome and Lennox-Gastaut syndrome.[5] In humans and animals, CBD has shown promise as a treatment for a wide variety of ailments, notably anxiety,[6][7][8][9][10] depression,[8] pain,[11][12][13][14] inflammation,[15][16] and cancer.[17]
Unlike cannabis and THC, CBD doesn’t impair coordination, judgment, or memory.[18] In a Critical Review Report published in 2018, the World Health Organization concluded that there was “no evidence of recreational use of CBD or any public health-related problems associated with the use of pure CBD".
What are CBD’s main drawbacks?
CBD’s adverse effects are usually minor, but they include lethargy, fatigue, sleepiness, fever, diarrhea, vomiting, decreased appetite, and increased levels of alanine aminotransferase (a marker of liver damage).[19][20][21]
Other drawbacks include a paucity of human evidence, the unreliability of most CBD products on the market, and the “gray area” legality of CBD products.
Aren’t CBD products legal?
What makes CBD products unreliable?
Quick answer:
The only CBD pharmaceutical approved in the U.S. (Epidiolex®) is approved only for two rare types of epilepsy. Nonpharmaceutical CBD products are widely available, but they often contain a lot more or less CBD than stated on the label, and even sometimes some THC.[1][2]
CBD products might also contain some of the same contaminants frequently found in cannabis: metals, molds, bacteria, pesticides, aflatoxins, synthetic cannabinoids,[29][30] and residual solvents from the production process (hexane, benzene, xylene, toluene, acetone, ethanol, and isopropyl alcohol).[31]
What makes CBD evidence poor?
Quick answer:
A 2019 review noted that human trials were few,[32] and they still are few in 2022. Most studies are in animals, and animal studies often translate poorly to humans[33] (CBD appears to be more bioavailable for rodents than for humans, notably[34]).
Moreover, what human trials we have didn’t last very long,[35] so we don’t know much about the long-term effects of CBD. For example, like cannabis itself, CBD has been touted as a potential cancer treatment,[36] yet CBD-induced receptor activation could theoretically worsen certain types of cancer, such as colon cancer.[37]
How does CBD work?
CBD works in myriad ways, which are still being explored. For instance, it may reduce pain and stress via the TRPV1 receptor,[22][23][24] stress and depression via the 5HTI-alpha receptor,[25][26] and inflammation via the A2A receptors.[27]
Unfortunately, CBD seems to work better in combination with THC.
