A new pilot study from researchers Viddiparti et al. found that, over a 70-day period, medical marijuana use in 15 study participants significantly improved PTSD symptom severity and also produced a significant reduction in nightmares.

In an interview with The Varsity, Dr. David Lawrence discusses a study he co-authored regarding how cannabis, alcohol, and cigarettes affect concussion symptoms and recovery. The study, published in Brain Injury, followed 307 subjects for four weeks after their concussion to track their recovery. they found that cannabis use was associated with lower symptom severity in the third and fourth week.

CBD products from marijuana will have accurate labeling for purity and cannabinoid content, where the sale of marijuana is legalized. CBD products from hemp are unregulated, so we recommend purchasing from CBD hemp companies vetted by the online community Reddit. An advantage of marijuana products is that THC also has some neuroprotective qualities, and works synergistically with CBD to enhance medical benefits.

World Health Organization (WHO) report: CBD has a "good safety profile" and "may be a useful treatment" for numerous medical conditions. In June 2018, WHO will do a further review of extracts or preparations containing almost exclusively CBD.