A tincture is a mixture of an herbal extract and a liquid (usually alcohol or MCT oil) that is administered orally or sublingually via a dropper. Tinctures are generally high in potency and are intended to give consumers a sugar-free, gluten-free, inhalation-free cannabis experience. AltSol's Great Day Sativa MCT Tincture is a sativa-dominant, double-strength cannabis tincture formulated with MCT (medium-chain triglyceride) oil.