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That said, the cost may be justified by the level of research that goes into Tru Niagen, which has undergone more rigorous testing and quality control than many other NAD+ supplements on the market, including third-party testing, being manufactured in ISO-certified labs, and being backed by more than 45 peer-reviewed clinical studies

doi: 10.1097/00019501-199310000-00009

[4] [7] [6] [8] [9] This substance is sometimes used in functional medicine despite not being approved by any drug regulatory agency

Support respiratory health: Its anti-inflammatory and bronchodilator properties may offer relief from respiratory ailments