BUY MEDTERRA CBD OIL. Quick to absorb & perfect for serving size control – these oil tinctures are designed for fast and easy relief. Futhermore, because all oils have ZERO THC content, they are safe to administer sublingually, by morning or night. Each 1oz (30ml) bottle contains 16mg of CBD per serving size (1ml), for a total of 500mg of CBD. Also available in 1000mg and 3000mg strengths.