* Orange Flavored Sublingual * Dietary Supplement Source Naturals Melatonin Complex is a soothing nighttime formula, which combines the neurohormone melatonin with three key inhibitory neurotransmitters: GABA, glycine, and taurine; and with Coenzymated vitamin B-6, the active form of vitamin B-6. The sublingual form is absorbed directly into the bloodstream, via the blood vessels under the tongue, and in the cheeks, bypassing the liver and allowing for quick entry to the system.