CBD of CBD per day schizophrenia forty to twelve hundred and eighty milligrams of CBD per day glaucoma 20 to 40 milligrams per day and chronic pain five to twenty milligrams of CD CBD oil per day now these dosage recommendations are based on using pure CBD extracted from cannabis sativa including hemp but it contains no THC now many in the cannabis world maintain that a combination of CBD and THC in varying ratios will provide greater therapeutic value than using CBD or THC alone so it's up to you to decide