Which questions can you ask about the work-up of your symptoms?
- Can we talk in detail about my symptoms and how they have developed?1
- Which physical examination do you consider useful?1
- Which basic tests and blood values make sense for me, for example blood count, blood glucose, an inflammation marker, liver values or the thyroid value (TSH)?1
- Should we also talk about sleep, breathing during sleep, mood and stress?1
- When would extended lab tests come into question?1
- When would a follow-up appointment make sense if the cause stays open at first?1
Which questions can you ask about NAD+?
- What is known about the benefits and risks of NAD+ and its precursors?
- Can an NAD+ value be measured in blood, and with which method?2
- How meaningful would such a value be for me?2
- Could NAD+ or a precursor interact with my medicines?
- What applies during pregnancy or with a cancer diagnosis?
According to a 2026 paper, normal NAD+ blood values in humans are so far not well known2. More on the page Can NAD+ be measured reliably in blood?.
Purpose: Information service and wording aid for the conversation with your own doctor. No detection, prognosis or treatment of diseases.
No diagnosis, no substitute for medical advice.
For acute symptoms: emergency number 112 (EU), 911 (USA), 999 (United Kingdom).
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Which sources does this page rely on?
- Maisel P, Baum E, Donner-Banzhoff N (2021). Fatigue as the Chief Complaint. Deutsches Ärzteblatt International. DOI: 10.3238/arztebl.m2021.0192
The paper summarises how family doctors may assess persistent fatigue. It is a review based on a literature search. Its authors suggest that history, physical examination and simple laboratory tests may usually be enough, with further tests mainly when other findings point that way.
- Euro L et al. (2026). Dynamics of blood NAD and glutathione in health, disease, aging, and under NAD+-booster treatment. Redox Biology. DOI: 10.1016/j.redox.2026.104343
The study developed a standardised measurement of NAD and glutathione from a single whole-blood sample. It is a methods and cohort study with 299 healthy adults. Levels appeared stable with age and rose to a different extent from person to person under NAD+ boosters.