As Terminator said you need to divide the ML into parts. So .1ml (one tenth) is 20mcg. If your dropper isn't very clearly marked in tenths, then things are going to get pretty tricky. It would be better to use a syringe anyhow. This is why liquid clen and T3 aren't such a great idea. If you off my only a few drops you will endup with a radically different dosage.