Higher limits allowed by FDA for Nitroso-sitagliptin

I suggest looking into this two publications:

Dr. Schlingemann @schlinjo1975 reported at a recent workshop in Amsterdam the results of NDMA formation dynamic in 5-year-old batches of metformin tablets linked to water content, i.e. Low water content has caused increased NDMA formation.

Also reports of NDMA in-situ formation in DCM, which suggest the use of nitrite scavenger in sample preparations for NDMA testing