Tinctures & drops.
Bottles will generally come with a pipette/dropper which will hold either 0.5mls (in the 30ml bottles) or a full 1ml serving (in the 100ml bottles). The best way to figure out your dosage is by looking at the strength per 1ml then working backwards from there. Generally speaking, most bottles will let you know how much is in 1ml of liquid, but if not, you can use a simple calculation to work it out. Take the total amount of CBD and divide it by the number of mls in the bottle. For example, a 30ml bottle with 500mg of CBD would be 500/30 to give you 16.6mg per ml.
If you want to take around 16mg a day and 1ml holds 16mg, you can have half a dropper full in the morning and half in the evening. While the higher dose bottles cost more, they’re also more potent meaning you often won’t even need a full pipette a day and just get by with a few drops for each serving.