Revida Labs oil (tincture is amazing, but expensive. Procana also has good tincture. In terms of CBD products it is important to find a product that is lab tested and willing to show you the lab results that prove they have the amount of CBD in it that they claim. Also make sure they use natural and/or organic ingredients. You don’t want any chemicals in the product. Also, if you can, try to go to a store where they are sold and see if you can try a sample if you are doing a tincture. Some tinctures can taste awful. For psoriasis it can benefit you to take it orally and to put the oil on topically. I use CBD for pain but my twin sister has psoriasis and uses the tincture from Procana for her psoriasis.
Pharmacology published a study in 2016 looking at medical marijuana for migraines, specifically in relation to its effects on serotonin, with very positive results. You’ll notice that neither study looked at CBD in isolation from other cannabinoids (which is an issue with a lot of research on CBD and pain). Truthfully, the research on CBD alone just isn’t sufficient to make any pronouncements about its effects on headache pain.