Which is the most reliable nmn raw material manufacturer in the world?

Among the NMN products I have bought, the factory in Gene Harbor has the highest specifications. There is no gene port in the factory, and not many brands are foundries. The factory has passed the double certification of GMP and FDA fssc 22000. As far as I know, many foreign brands of NMN products import raw materials from Gene Harbor? It's not produced by itself. Therefore, if you choose the source and quality with confidence, you can choose the brand gene port.