Niacinamide USP Grade No.1 manufacturer Year yield 6000mt Certificate:ISO, ... 10%MAX MELTING TEMP. 128~131°C ORG. VOL. IMPURITIES USP 32 SULFATE ASH 0.1%MAX PH IN SOLUTION 5 ... one container.2. Quality control, before shipment, free sample for test. after shipment, keep sample for 3 years3. Prompt shipment with ... documents4. Packing as your request, with photo before shipment USP Grade Niacinamide