# Nicotinamide Mononucleotide (NMN) and Its Role in Immune Thrombocytopenia Treatment

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NMN & NR Supplementation · 2026-04-29


    Nicotinamide mononucleotide (NMN) shows promise as a treatment for immune thrombocytopenia (ITP), a condition characterized by low platelet counts. This study investigates the safety and efficacy of low-dose oral NMN in adults with steroid-refractory or steroid-dependent ITP. The findings contribute to a growing body of research exploring NMN's role in immune function and its potential implications for longevity.

 What this study examined

This study conducted a phase 1/2 trial to evaluate the use of low-dose oral NMN (450 mg twice daily for two weeks) in adults suffering from steroid-refractory or steroid-dependent ITP. The primary endpoints were safety and tolerability, along with the platelet response defined as a significant increase in platelet counts. A total of 25 patients were enrolled in this open-label trial, with assessments made to determine the effectiveness of NMN in improving platelet levels without the need for additional immunosuppressive therapies.

 Why this matters for longevity research

The findings from this study are significant as they highlight the CD38-NAD+ axis as an important immunometabolic checkpoint in ITP. By restoring NAD+ levels through NMN supplementation, there may be broader implications for enhancing immune function and overall healthspan. NAD+ is crucial for cellular metabolism and energy production, and its depletion is associated with various age-related diseases. Understanding how NMN can influence immune responses could provide insights into strategies for promoting longevity and mitigating age-associated decline.

 Key findings

No dose-limiting toxicities or serious adverse events were reported during the trial.

NMN was well tolerated, with mild treatment-related adverse events observed in a minority of patients.

20% of patients met the primary endpoint of platelet response within the treatment period.

60% of patients experienced an increase in platelet counts exceeding 1.5 times their baseline levels.

52% of patients maintained improved platelet counts through week 8 of the follow-up.

Immunoglobulin levels remained stable, indicating preserved humoral immunity.

The study supports the exploration of NMN as a non-antibody-depleting strategy for treating antibody-mediated diseases.

 The science behind it

The mechanism underlying the effects of NMN is linked to its role in increasing NAD+ levels, which are essential for various cellular processes, including energy metabolism and DNA repair. CD38 is an enzyme that consumes NAD+, leading to its depletion and subsequent immune dysfunction. By inhibiting CD38 or supplementing with NMN, researchers observed a reprogramming of macrophages, which play a crucial role in immune responses. This reprogramming downregulated Fc gamma receptor I (FcγRI) expression, reducing macrophage-mediated phagocytosis of platelets and thus alleviating thrombocytopenia. These findings align with ongoing research into the role of NAD+ and sirtuins in aging and immune function.

 How it fits into the longevity field

The exploration of NMN in this context adds to a growing body of literature examining NAD+ precursors as potential interventions for age-related conditions. Other studies have suggested that NMN may enhance mitochondrial function, improve metabolic health, and even influence epigenetic factors associated with aging. As research continues to unveil the complexities of NAD+ metabolism, NMN could emerge as a key player in strategies aimed at extending healthspan and addressing immune-related disorders.

 Practical takeaways

Researchers and informed readers should consider the implications of NMN supplementation in the context of immune function and aging. While this study provides valuable insights into NMN's potential benefits, further research is necessary to fully understand its mechanisms and long-term effects. The findings underscore the importance of exploring metabolic strategies to enhance immune responses and overall health, particularly in aging populations.

 FAQ

 What is nicotinamide mononucleotide (NMN)?

NMN is a nucleotide derived from ribose and niacin, which plays a crucial role in the production of NAD+, a vital coenzyme in cellular metabolism.

 How does NMN affect immune function?

NMN supplementation may restore NAD+ levels, which can reprogram immune cells and improve immune responses, potentially benefiting conditions like immune thrombocytopenia.

 What are the implications of this study for longevity research?

The study highlights the potential of NMN as a metabolic strategy to enhance immune function, suggesting broader applications in promoting healthspan and addressing age-related immune decline.

 Source: PubMed · Nat Med · published 2026-04-29.

## Sources

- PubMed · Nat Med: https://pubmed.ncbi.nlm.nih.gov/42056497/