Its thought the gut might preferentially use the NA form since intestinal tissue contains all needed enzymes to convert NA to NAD.[6] Recent research suggests that cells have specialized receptors for NMN
Notably, all these experimental studies have certain limitations in their design
doi:10.1007/BF00762777
Pharmaceuticals 4(1):187201 Holguin F, Grasemann H, Sharma S, Winnica D, Wasil K, Smith V et al (2019) L-Citrulline increases nitric oxide and improves control in obese asthmatics
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