Since 1988Uthever® Youth Forever, World's Best NMNNicotinamide MononucleotideDietary SupplementNot All NMN is Created EqualProHealth uses Uthever® - the world's purest and most stable pharmaceutical grade NMN. It is manufactured in a climate- controlled FDA registered facility in the United States and triple tested by third party labs to assure unparalleled purity. NMN Pro Lozenges™ allow NMN to be absorbed directly into the blood vessels in the mouth and under the tongue, avoiding digestion in the gastrointestinal tract and allowing for more rapid delivery into the bloodstream.