500mg in 100ml means a strength level of 0.5% .  Typically one application is 3ml (half a teaspoon) which contains ca. 15mg so assuming a maximum daily dosage of 70mg a bottle will last you ca. 3 days when you apply 5 times a day. This is classed as low strength. The Best deals we can find at the moment are: Please check the tabs below for more detailed information