A tincture is a liquid cannabis extract, usually sold in a small glass bottle with a dropper. Traditionally, tinctures were made by soaking cannabis in alcohol. Today many are made by mixing extract into a carrier oil like MCT or olive oil, though alcohol-based versions still exist.
Tinctures are easy to dose because the dropper is marked. The label should tell you how many mg of THC, CBD or other cannabinoids are in each milliliter or each full dropper, and how many are in the bottle.
There are two common ways to use one. Placed under the tongue and held for a minute or so, some of it may be absorbed there, and people often report a faster onset than with edibles. Swallowed or mixed into food or a drink, it acts more like an edible, with a slower onset and longer duration.
Because the onset can vary, the start-low, go-slow approach applies. Begin with a small measured amount and wait before taking more.
Store tinctures upright, sealed, away from heat and light, and out of reach of children and pets. Check the COA to confirm the mg per serving.