A CBD tincture is a dietary supplement that comes in liquid form and has a very potent cannabidiol content. Tinctures are created by steeping CBD-rich hemp flowers in high-proof grain alcohol, then cooking over low heat for multiple hours.
Since tinctures are concentrated, it’s supposed to be taken in small doses. A built-in mL dropper, but some people use an eye dropper. Taking too much won’t cause an overdose or anything like that, but huge doses are often unneeded by most therapeutic CBD users. If more is needed, it is a simple case of having a few more drops.