My Bottle of Medical CBD says take .5 mg to 1.0. I take the 1.0 mg of the 20 CBD to 1 THC ratio.
Caution to anyone taking the 1 to 1 ration THC to CBD, it can hit you like edibles. Use a small amount, it takes up to an hour before you feel it. Also if you have anxiety, the less THC the better, it can raise your anxiety level to very uncomfortable. THC on the salve aka topical products is awesome, has no effect for a high!, but is powerful on nerves and body pain. CBD/THC topical salves also can also work miraculous on body or nerve pain. Kind regards!