CBD oil is an essence extracted from hemp and containing mostly cannabidiol with other cannabinoids added. Dosages are most often in the range of 2 to 30%. However, CBD 4 and CBD 10 are the most commonly used oils by consumers.
Whether it's CBD 4 or CBD 10, each of these oils is tailored to a specific type of use and consumer needs. So the best dosage is the one that best suits your needs.