In order to account for the low CBD content of these hemp plants, manufacturers have to process large volumes of raw material at a time, with the idea of extracting just enough CBD so that they can label their product as a “CBD oil.” While this method is fine in theory, what ultimately ends up happening (unless the manufacturer’s extraction methods are state of the art), is that traces of chemicals cane end up being left over in the final product. These chemicals can potentially contain harsh solvents such as butane, hexane, and propylene glycol, which has been known to break down into carcinogenic (cancer-causing) compounds like formaldehyde and acetaldehyde.
I cannot personally vouch for most of the brands on Amazon currently vs. most of the merchants on our page here, but I include Amazon as a resource for the folks that are comfortable shopping via that platform. You can also find my beginners guide, The Cannabis Oil Companion on Amazon in both paperback and Kindle.  *We have been having some issues with our Amazon widget not displaying below intermittently in certain browsers, trying to troubleshoot this behavior, we apologize if this is not rendering for you.  There is also a text link to Amazon's hemp oil section listed below.
The manufacturer will probably give you a recommended dosage, but bear in mind that this isn’t set in stone. What you need to find is your own minimum effective dose. “Minimum effective dose” is a medical term which refers to the amount of a substance you need for the results you want, and above which, the substance doesn’t increase in effectiveness.

Strength is also an extremely important consideration. Beginners may find that it’s easier to control dosage using a lower strength tincture. On the other hand, experienced CBD consumers know that high strength tinctures are more cost effective. Although stronger tinctures cost more, you get more CBD oil and other beneficial cannabinoids in each drop. Most CBD brands offer more than one option for strength.
Transparent test results that are easily accessible also help customers ensure they’re looking at data that’s relevant to the product they’re actually ordering. Past performance is no guarantee of future results, and a good grade for one batch of product doesn’t always translate to the next round. That’s why responsible testers don’t stop at one good result, but continually update customers with the latest data available on their products.

To get almonds from an almond tree, you can just shake the tree. To get juice from an orange, you can simply squeeze the fruit. But getting CBD oil from hemp is a much more complicated process. The cheapest and easiest ways to extract CBD oil from hemp commonly involve harsh solvents that can leave chemical residue in the CBD oil. The best, and most reliable extraction method, uses carbon dioxide (CO2) under high pressure and extremely low temperatures to pull out as much CBD as possible without introducing contaminants. Once the CO2 is no longer under intense pressure, it simply evaporates, leaving virtually no trace of extraction on the CBD oil.
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