"I have myelofibrosis and have been taking CBD for a year in tincture form but can find no information on dosage. Can you give me an idea?"
Actually, any information given could be wrong because there is not enough information in your question to be able to answer with any certainty of accuracy. How much THC is in your tincture?
There should be a dose or strength listed for your CBD tincture.
Please, give more complete information.
If your cannabis is only CBD meaning it is hemp, we do not have current studies as to how much will work or even that it does work the same as CBD : THC cannabis.
Typically, a dose of CBD will last 4-6 hours.