NAD+ IV Therapy:
What the Evidence Says
NAD+ has a compelling role in cellular biology. The clinical evidence for direct intravenous therapy is much less settled. Here is the balanced, doctor-led view.
In brief: NAD+ is essential to normal cellular metabolism. Studies of oral NAD+ precursors can increase NAD-related metabolites in people, but this does not establish that direct NAD+ IV therapy delivers anti-ageing, cognitive, energy or disease-prevention benefits. The most rigorous reviews conclude that clinically meaningful outcomes remain uncertain and need larger, controlled trials.[3][4] At Victoria Medical, we favour a measured approach: investigate symptoms and deficiencies first, then discuss any wellness treatment in its proper evidence context.
What NAD+ does in the body
NAD+ is a coenzyme that participates in oxidation–reduction reactions needed to generate cellular energy. It is also consumed by enzyme families involved in DNA-damage responses and cellular signalling. This makes NAD+ metabolism a legitimate area of scientific interest in ageing and metabolic disease. However, a plausible mechanism is not the same as a proven treatment effect.
Most human research has studied oral precursors such as nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN), rather than direct IV NAD+. In a small randomised crossover study, six weeks of oral NR raised NAD-related metabolites in healthy middle-aged and older adults and was generally well tolerated.[1] That finding is important but limited: it demonstrates a biochemical change, not a broad wellness or longevity outcome.
What the human evidence currently supports
| Question | Evidence-based answer |
|---|---|
| Does NAD+ matter biologically? | Yes. NAD+ is a coenzyme involved in cellular energy transfer, DNA repair and signalling pathways. Its biological importance does not itself establish that an infusion improves wellbeing or prevents disease. |
| Do NAD+ precursors raise NAD-related metabolites? | Yes, small human studies of oral nicotinamide riboside (NR) and NMN show increased NAD-related metabolites in blood or tissue.[1][2][6] |
| Do human studies prove anti-ageing, energy or cognitive benefits? | No. Current clinical studies are generally small, short and heterogeneous. Reviews find few consistently clinically meaningful outcomes and call for larger trials.[3][4] |
| Is direct NAD+ IV therapy the same as oral NR or NMN research? | No. Most published human evidence concerns oral precursors or NADH, not direct NAD+ IV infusions. Results cannot simply be transferred between routes or products. |
| Can it replace investigation or treatment for fatigue? | No. Persistent fatigue, weight change, breathlessness, palpitations or neurological symptoms need clinical assessment and targeted testing first. |
Direct NAD+ infusion versus NAD+ precursors
This distinction matters. An NAD+ infusion, an oral NR supplement and an oral NMN supplement are not interchangeable interventions. They have different routes of administration, pharmacokinetics, doses and study bases. A result from an oral precursor trial should not be used as proof that an IV infusion will produce the same clinical outcome.
A 2023 critical review of 25 published human NR studies found that oral NR had shown few consistently clinically relevant effects, despite a tendency for claims to outrun the data.[3] A 2024 systematic review similarly found that NAD-related supplements were generally tolerated in the included studies but that stronger research is needed to identify disease-specific benefits and doses.[4]
From Our Practice — Dr George Xynopoulos
“The appropriate clinical starting point is not ‘Which drip should I have?’, but ‘What are we trying to address?’. If someone has persistent fatigue, palpitations, weight change, muscle symptoms or low mood, I first consider the common, testable causes. If a patient is considering an NAD+ infusion as a wellness choice after an informed discussion, the important thing is to be clear about what the evidence does and does not yet show.”
Four claims to approach carefully
“NAD+ IV therapy is proven to reverse ageing.”
Not establishedCell and animal research is interesting, but there is no robust human evidence that an NAD+ infusion reverses biological ageing.
“An infusion is the same as fixing a vitamin deficiency.”
Not the sameNAD+ is a cellular coenzyme. It is not a substitute for treating confirmed B12, iron, thyroid, vitamin D or other deficiencies.
“If I feel tired, NAD+ is the right first step.”
Usually notFatigue is non-specific. A GP review and appropriate blood tests can identify common, treatable causes before a wellness treatment is considered.
“Doctor supervision makes every proposed benefit proven.”
NoMedical supervision improves suitability and safety oversight; it does not turn preliminary evidence into proven clinical benefit.
When a clinical review is more useful than an infusion
A wellness infusion should never delay assessment of symptoms that could signal an underlying condition. If you have persistent fatigue, shortness of breath, palpitations, unexplained weight change, ongoing diarrhoea, neurological symptoms, heavy periods or a change in mood, a private GP consultation and targeted blood tests may be the more appropriate first step. Deficiencies and endocrine disorders are common, measurable and often treatable.
Important: New chest pain, fainting, severe shortness of breath, one-sided leg swelling, sudden neurological symptoms or thoughts of self-harm require urgent medical assessment rather than a wellness appointment. Call 999 for an emergency or use NHS 111 when you need urgent advice.
Frequently asked questions
What is NAD+?
NAD+ stands for nicotinamide adenine dinucleotide. It is a naturally occurring coenzyme found in all living cells. It helps transfer energy within cells and is used by enzymes involved in metabolic and DNA-repair pathways.
What is NAD+ IV therapy?
It is an intravenous infusion containing NAD+ administered over a controlled period. Clinics may offer it within a broader wellness service. It should not be presented as treatment for a disease unless that use is supported by appropriate evidence and prescribing assessment.
What can I realistically expect?
Some people report subjective wellbeing benefits, but individual experiences are not proof of efficacy. The best-supported conclusion is that evidence for direct NAD+ IV infusions remains limited. We discuss your goals, medical history and alternatives before making any recommendation.
Are there side effects?
Adverse effects may include discomfort at the cannula site, headache, nausea, chest or abdominal tightness, flushing, fatigue or feeling unwell during an infusion. Any infusion also carries uncommon risks such as bruising, infection or allergic reaction. You should tell the clinical team immediately if you feel unwell.
Do I need blood tests first?
Often, a targeted assessment is more useful than a generic infusion. If fatigue, low mood, muscle symptoms or frequent infections are a concern, we may recommend blood tests for causes such as iron deficiency, B12 deficiency, thyroid dysfunction, diabetes or vitamin D deficiency before discussing wellness treatments.
Do I need a referral?
No referral is usually needed to enquire. However, all treatments should follow an individual clinical suitability review. You can book a GP consultation if you would first like an evidence-based review of symptoms or test results.
References
- [1]Martens CR, Denman BA, Mazzo MR, et al. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults. Nature Communications. 2018;9:1286. https://doi.org/10.1038/s41467-018-03421-7
- [2]Elhassan YS, Kluckova K, Fletcher RS, et al. Nicotinamide riboside augments the aged human skeletal muscle NAD+ metabolome and induces transcriptomic and metabolomic changes. Cell Metabolism. 2019;30(6):1071–1085.e5. https://doi.org/10.1016/j.cmet.2019.08.010
- [3]Damgaard MV, Treebak JT. What is really known about the effects of nicotinamide riboside supplementation in humans. Science Advances. 2023;9(29):eadi4862. https://doi.org/10.1126/sciadv.adi4862
- [4]de Mello Gindri I, Ferrari G, Pinto LPS, et al. Evaluation of safety and effectiveness of NAD in different clinical conditions: a systematic review. American Journal of Physiology-Endocrinology and Metabolism. 2024;326(4):E417–E427. https://doi.org/10.1152/ajpendo.00242.2023
- [5]Yoshino M, Yoshino J, Kayser BD, et al. Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women. Science. 2021;372(6547):1224–1229. https://doi.org/10.1126/science.abe9985
- [6]Igarashi M, Miura M, Williams E, et al. Chronic nicotinamide mononucleotide supplementation elevates blood NAD+ and alters muscle function in healthy older men. NPJ Aging. 2022;8:5. https://doi.org/10.1038/s41514-022-00084-z
Dr George Xynopoulos
Consultant Physician & Cardiologist | GMC Registered | MRCP (UK)
Dr Xynopoulos is a Consultant Physician and Cardiologist at Victoria Medical in Victoria, London, with a clinical focus on evidence-led diagnosis, prevention and patient-centred care.
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