PREMIER RESEARCH LABS MELATONIN-ND™ A nutritional industry first, featuring melatonin in a convenient liquid form that has been cultured with beneficial probiotic organisms for active bio-availability. Melatonin-ND™ is not animal-derived so it is suitable for everyone, including vegetarians and vegans. This premier quality formula is fermented using a unique probiotic culture which allows rapid delivery and superior bioenergetic dynamics. Many people say they can feel the effect of this product the very first time they take it.