Best-fit distinction
The route should match the question being asked
NAD+ is involved in cellular redox reactions and related vitamin B3 biology, but route matters. A prescription-reviewed injection is a systemic product and should be evaluated like a medication or compounded prescription. A face cream is applied to skin and should be evaluated as a topical product with cosmetic-claim limits, irritation risk, and routine compatibility. The safer question is not “which is stronger,” but which format fits the goal and medical context.
- Injections may be discussed around broader wellness goals, but evidence for anti-aging or fatigue outcomes remains limited and patient-specific.
- Face cream belongs in a skin-care conversation: sensitivity, retinoids or acids, procedures, pregnancy context, and what cosmetic claims are being made.
- A topical product should not be treated as a substitute for clinician evaluation of fatigue, brain fog, anemia, thyroid disease, sleep problems, depression, or medication side effects.