I counted each drop out of the dropper to get to 1ml-200mcgs and it took between 36-40 drops.200/36=5.5 mcgs per drop or 200/40=5.0mcgs per drop I must say this is strong shit.So if I took 4 drops it would be either 20mcgs or 22 mcgs that shount be to big of a diffrence I dont think.If I wanted an exact 100 mcgs 1/2 ml and so on I can read that in my measurement spoon until less than 50mcgs were I can use the drop by drop method.Does this sound alright. Thanks J