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There are companies that do intracellular NAD testing

10.3390/ijms21228542 Int

Freiherr J, Hallschmid M, Frey WH et al (2013) Intranasal insulin as a treatment for Alzheimers disease: a review of basic research and clinical evidence

Cardiovascular Health B12 contributes to heart health through several mechanisms: Helps regulate homocysteine levels (a risk factor for heart disease) Supports red blood cell production for efficient oxygen transport Contributes to healthy blood vessel function Helps maintain proper nerve signals to the heart While not a primary treatment for heart conditions, optimal B12 levels support overall cardiovascular wellness