Mg is the total amount of CBD in a container, whilst the % is the concentration strength by volume. Let's compare a 30ml CBD bottle containing 3000mg of CBD, and a 10ml bottle containing 1500mg of CBD. Don't let the higher 3000mg dazzle you, as the 1500mg bottle has a higher % strength! The 30ml bottle contains 3000mg of CBD or 1000mg per 10ml, equivalent to 10% strength.Whilst the smaller 10ml  bottle contains 1500mg per 10ml, therefore has a higher CBD strength of 15%!