Werner syndrome (WS), a rare genetic disorder that causes accelerated aging. From their twenties, patients develop gray hair, hair loss, cataracts, diabetes, and other age-related conditions normally seen in the elderly. Additionally, patients develop severe and untreatable skin ulcers, often requiring limb amputation, and face early death from cardiovascular diseases or cancer. This debilitating condition, which affects approximately nine per million people in Japan, lacks effective treatment options.
Interestingly, a recent study from the Bohr lab (Nat Commun, 2019 Nov 21;10(1):5284) showed that patients with WS model systems and patients had decreased levels of nicotinamide adenine dinucleotide (NAD+), a biomolecule crucial for cellular energy production, DNA repair, and various metabolic processes. This finding suggested that NAD+ depletion may contribute to the progression of the disease. While direct NAD+ supplementation isn't feasible in mammals, using its precursor—nicotinamide riboside (NR) from Niagen Bioscience—has shown promising results in animal studies, extending lifespan and protecting against age-related decline. In human clinical trials, NR has also demonstrated benefits against chronic inflammation, metabolic disorders, and muscle weakness across various populations. However, the effects of NR in WS remained largely unexplored—until now.
In a recent study, a research team led by Associate Professor Masaya Koshizaka from the Center for Preventive Medical Sciences, Chiba University/Department of Diabetes, Metabolism and Endocrinology, Chiba University Hospital, Japan, conducted the world's first rigorous clinical trial of NR in patients with WS. Their paper, published in Aging Cell on June 03, 2025, was co-authored by University President Koutaro Yokote, Assistant Professor Hisaya Kato, Associate Professor Yoshiro Maezawa, and Assistant Professor Mayumi Shoji, all from Chiba University, along with Affiliate Professor Vilhelm Bohr from the University of Copenhagen, Denmark.
This groundbreaking work involved a randomized, double-blind, placebo-controlled trial to evaluate the safety and effectiveness of NR supplementation. The research team enrolled patients with WS in a crossover design, where participants received either a daily dose of NR or a placebo for 26 weeks, switched treatments for another 26 weeks. Researchers tracked NAD+ blood levels, skin ulcer size, arterial stiffness, and kidney function.
NR supplementation significantly increased NAD+ levels in patient blood compared to placebo. Importantly, NR improved arterial stiffness (a marker of cardiovascular disease risk), reduced the skin ulcer area, and appeared to slow the progression of kidney dysfunction—all without any serious side effects. Moreover, a comprehensive examination of metabolites in blood revealed that NR treatment reduced levels of creatinine and other compounds associated with kidney dysfunction. This suggests that NR may help protect kidney function, addressing another serious complication of WS.
Dr. Yasmeen Nkrumah-Elie, Global Director of Niagen Bioscience's External Research Program called CERP, commented, "this study represents a significant step forward in understanding how NAD+ restoration with NR may help address the underlying biology of WS. By supporting cardiovascular, skin, and kidney health, NR shows potential to improve the quality of life for patients with this devastating condition. We are proud to support Chiba University's groundbreaking research as part of our ongoing commitment to advancing NAD+ science for rare and underserved diseases."
The treatment's multiple benefits across many different organ systems indicate that NAD+ depletion may be a fundamental mechanism in WS that can be targeted therapeutically. "Our findings suggest NR could serve as a valuable treatment option for two major symptoms, arteriosclerosis and skin ulcers, as well as for preventing kidney function decline," explains Dr. Koshizaka. The results are particularly significant given that untreatable skin ulcers affect well over 70% of patients with WS, often leading to amputation, while cardiovascular disease remains a leading cause of early mortality in this population.
Though larger studies are needed to extend these findings, this pioneering research offers new hope for patients with WS who have long lacked effective treatment options. Beyond its immediate implications for this rare condition, the study also provides valuable insights into the biology of aging and potential interventions to address age-related decline more broadly.
"We hope our work will accelerate studies on not only WS but also other premature aging disorders and common age-related diseases—ultimately helping to extend health span and improve quality of life in both patients and the broader population," concludes Dr. Koshizaka.
About Associate Professor Masaya Koshizaka
Masaya Koshizaka, an Associate Professor at Chiba University, is a distinguished researcher specializing in metabolic disorders, aging and progeroid syndromes, and cardiovascular biology, with expertise in clinical pharmacology and therapeutics. His extensive body of work, comprising over 83 publications, demonstrates a broad and impactful research scope. Key contributions include investigating novel treatments for diabetes, diabetes complications such as diabetic macular edema, obesity, and dyslipidemia, and advancing our understanding of diabetes management and associated risks. Notably, he has significantly contributed to clinical studies regarding Werner syndrome, including the Japanese Werner Syndrome Registry and the study of NR supplementation. Recently, he is also been engaging with large- scale cohort studies, the Japan Environment and Children's Study (JECS) and the Chiba study of mother and child health (C-MACH).
Material source and authentication: Niagen Bioscience (formerly ChromaDex), a Los Angeles, California-based bioscience company at the forefront of NAD+ research, provided its patented nicotinamide riboside ingredient, Niagen, and placebo material as 250 mg capsules. The NR was manufactured in a GMP-compliant facility according to ISO/IEC 18025:2005 standards. Niagen Bioscience was not involved in the study design, execution, data analysis and interpretation, manuscript preparation, or the decision to publish. The funding source was not involved in the study design, the collection, analysis, and interpretation of data, the writing of the report, and the decision to submit the article for publication.
