Results indicated that CBD significantly reduced subjective measures of anxiety as evidenced by changes in VAMS scores. Neuroimaging data revealed decreased ECD-tracer uptake when participants received the CBD compared to when they took the placebo. Particularly, activity in the left amygdala-hippocampal complex and the left posterior cingulate gyrus decreased following CBD administration.
Subjects were instructed to abstain from alcohol for 24 h and caffeine for at least 24 h before each visit to the laboratory. Subjects who reported having less than 6 h of sleep the previous night were excluded from the trial. After at least 8 h of fasting, subjects were instructed to have a light, standardized meal 2 h before the experiment. For the present study, a randomized, double blind, and crossover model was used. Once one volunteer gave up participating the study, the 26 participants were assessed on two different occasions, in a 2-week interval, with identical procedures except for the substance that was administered. In each visit, participants were first submitted to a cognitive and subjective evaluation, then an oral dose of CBD (300 mg) or placebo was administered 30 min before the polysomnographic recordings began.
Regardless of how CBD oil induces hippocampal neurogenesis, the growth of new brain cells may be enough to decrease anxiety. A report published in 2015 documented that increasing adult neurogenesis (regardless of the modality) is sufficient enough to decrease anxiety. Therefore, it could be that CBD is an effective anxiolytic predominantly through mechanisms implicated in neurogenesis.
McGuire doesn’t advise buying CBD products. You need to differentiate, he says, between the extremely high doses of pharmaceutical-grade pure CBD that participants in the handful of successful studies were given and the dietary supplements available over the counter or online. “These may contain quite small amounts of CBD that might not have large enough concentrations to have any effects,” he says. “It’s the difference between a nutraceutical and a pharmaceutical.” These supplements aren’t allowed to make claims of any effects. “If you’re making creams or sports drinks with CBD, you can say anything you like as long as you don’t say it will do such and such,” he says.
Polysomnography recordings were obtained through a computerized system (BrainNet BNT; LYNX Tecnologia Eletrônica, Rio de Janeiro, Brazil). Sleep stages were recorded in periods of 30 s, according to the criteria established by Rechtschaffen and Kales (1968). The following polysomnographic parameters were evaluated: total sleep time (TST, min), sleep onset latency (min), rapid eye movement (REM) onset latency (min), wake after sleep onset (min), wake after sleep onset index (h), apnea index (h), hypopnea index (h), respiratory disturbance index (RDI, h), sleep efficiency (%), stage 1 sleep (%), stage 2 sleep (%), stage 3 sleep (%), REM (%), lowest saturation (%), and baseline saturation (%).
It's also safe to take up to 1,500 milligrams of CBD, according to a study published in Neurotherapeutics, which means there's not much risk—and maybe a fair amount to gain—in dosing yourself before bed. So over the course of two weeks, I experimented with four different kinds of CBD to see how it would affect my sleep. I took each one at the same time each night and each type for three nights. Here's what went down:
One of the strongest nutraceutical CBD oils is called Charlotte’s Web, with a 50mg dose. Charlotte’s Web is produced in Colorado by the Stanley Brothers, and named after Charlotte Figi, a girl who became famous in the US after her frequent seizures, brought on by the rare Dravet syndrome, were greatly reduced when she started taking CBD oil aged five. The company makes THC products too and is extremely successful, having just offered shares on the Canadian securities exchange, raising about $100m.
CBD products that don't contain THC fall outside the scope of the U.S. Drug Enforcement Agency's (DEA) Controlled Substances Act, which means CBD products are legal to sell and consume as long as they don't have THC. That's likely one of the reasons why CBD products, including CBD oil, are becoming more socially acceptable and increasingly popular. In 2016, Forbes reported that CBD products are expected to be a $2.2 billion industry by 2020.
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