What exactly is cannabidiol (CBD) and more importantly, what does it do? Those questions and more are at the heart of this comprehensive guide to one of the most fascinating and important compounds of the cannabis plant. Cannabis plants are chemical powerhouses that produce more than 400 different compounds. Not all of those compounds are unique to marijuana, of course, and appear in many other species of plants. That’s why marijuana can smell like pine trees or taste like fresh lemons. But of those 400 compounds, more than 60 of them are totally specific to the plant genus Cannabis. Scientists call these special compounds “cannabinoids.” However, not all cannabinoids are created equal. One of them, cannabidiol, or CBD, holds the key to the wide variety of medicinal and therapeutic effects marijuana offers.

*[A couple things of note before I begin the reviews. In order to avoid redundancy and limit repeating myself dozens of times over, be advised that (unless otherwise noted), all of the companies listed below employ standard practices that are used by all of the best CBD oil companies, including things like: solventless CO2 extraction, 3rd party laboratory testing, legal THC limits below 0.3%, shipping to all 50 U.S. states, etc..]
Drops (also referred to as tinctures) are the most popular way to take CBD oil. They are typically sold in glass bottles with a built-in dropper. The drops are placed under your tongue and held there for at least 60 seconds. This drop process allows the CBD to absorb sublingually into your bloodstream. Other popular ways to take CBD include vaping, gummies, capsules, and topical creams. How you take it is a personal decision based on your preferences. Many experienced users take multiple different products at the same time.
If medical marijuana is illegal in a given state, THC levels determine whether a CBD product is illicit or not. In most places, the limit is extremely low. We’re talking under 1 percent THC, with some states opting for a cap as low as 0.3 percent. In this case, the only source that would work is hemp, and CBD products will, therefore, be hemp-derived.

Transparency: Fab’s website features third-party lab results for most products. They only have a lab test for one of their tinctures though (which shows results for cannabinoid potency, as well as contaminants like pesticides). Customer service pointed out that the same CBD oil is used for all their products, but since potencies do vary, we appreciate companies that show potency testing for all products.

One quick thing before you check out our top recommended CBD products: CannaHealth was not paid to include any of these companies on our list. We may, however, receive a small commission from some of these brands if you click through and make a purchase (at no additional charge to you). I will assure you that these products are the best you can buy, and we 100% stand behind them.
Cutting-edge science has shown that the endocannabinoid system is dysregulated in nearly all pathological conditions. Thus, it stands to reason that “modulating endocannabinoid system activity may have therapeutic potential in almost all diseases affecting humans,” as Pal Pacher and George Kunos, scientists with the U.S. National Institutes of Health (NIH), suggested in a 2014 publication.
There are two possible exceptions to this. The first is that some people, for unknown reasons, just react differently to CBD. According to Dr. Chin, about 5% of people say they feel altered after taking CBD. "Usually they're the same people who have side effects from Advil or Tylenol," she says. You never know how your body will react to any new supplement, so when taking CBD for the first time, do so safely under supervision.
Spruce was founded by Tony Spencer, who had a clear mission for his company—give people access to safe and effective lab-grade, hemp-based CBD. Spencer realized that many other CBD oils on the market were low-potency and simply didn’t work. “We have a lot of customers in pain who have wasted money on CBD products in the past that didn’t work for them,” remarks Spruce on their website. 
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