Under the tongue, there is a vein called the sublingual gland. When a substance is administered to the sublingual gland, it gets absorbed directly into the bloodstream, which is referred to as sublingual consumption or sublingual administration. Common sublingual consumption methods include CBD tinctures, CBD lozenges and CBD sprays.
Because sublingual consumption is more direct, it impacts the body quicker than oral consumption and maintains higher availability, only being degraded from enzymes in the mouths saliva.
Because there are a few different factors that will impact the CBD bioavailability of sublingual consumption (most involving the quality of CBD), reported rates range from 12%-35%, which is still significantly higher than oral consumption.