The dosage listed on the bottle is only a suggestion. Based on what you are using CBD for, your individual constitution, your weight, and other factors you may find a better effect with more or less CBD. It is recommended that one should start on the low end of the dosing and work their way up until the desired effects are felt.
Below are the results of a survey of people who used CBD for various conditions and how much they needed on average to find relief and can serve as an example of how much CBD a person of average height and weight used for specific ailments.