"He is 8 years old and has colitis. I’d like to try using a high-CBD low-THC marijuana oil (20:1). Any dosage recommendations?"
For kids with inflammatory bowel I recommend CBD in an adult dose that is often necessary to block the inflammatory condition in the colon. A highly palatable liposomal product is available at Elixinol as a hemp extract. Start with 5mg (5 pumps) two or three times per day and expect some immediate control of symptoms. CBD alone has been shown to be effective in many IBD conditions.