The differences are FDA approval status (weight loss vs diabetes), pricing, and supply availability
Moreover, the detrimental side effects of NAD + and its intermediates may be caused by the NAD + -dependent sirtuins that have both oncogenic and tumor suppressive activity in different contexts
That said, there is still limited human evidence comparing oral and injectable forms for tendon healing
Quantitative endpoints, such as MRI-PDFF and histology, can capture subtle yet clinically meaningful changes, whereas ALT/AST and ultrasonography may miss early metabolic improvements
Pepoy and B
Glutathione has a generally favorable safety profile, but the most important interactions are with sulfa and sulfite-containing medications and preservatives, with chemotherapy drugs (where antioxidant supplementation may interfere with treatment intent), and in patients with severe asthma where sulfite preservatives can trigger bronchospasm