International Journal of Physiology, Pathophysiology and Pharmacology, 4 (2), 59-73
If your digestive system isn't working properly, oral supplements can be ineffective
NAD+ 1000 mg Lyophilized Powder + 10 ml Bacteriostatic Water (2-Vial Research Kit) 1000 mg + 10 ml Sterile research-use set with one vial of lyophilized NAD+ and one vial of bacteriostatic water for reconstitution
But when fatigue is accompanied by other symptoms, such as shakiness or trouble walking, tingling in your hands and feet, or shortness of breath, it may be time to consider whether your lack of energy could be tied to something more than just another busy day
Why can't we just 'eyeball' it
Patients with more severe or longstanding deficiency may take longer to notice the full benefit