⚠️ If you are currently being treated for cancer — or have a history of cancer — do not take NMN or any NAD+ precursor supplement without first consulting your oncologist.
A landmark study published in Cancer Letters (February 2026) found NMN and other NAD+ precursors may help cancer cells survive chemotherapy. This is not a theoretical concern — it is an active research finding from a peer-reviewed study at a major research university. Discuss all supplements with your cancer care team.
Why We're Writing This
Charge Products sells NMN supplements. We have done so for years and continue to. NMN is a well-researched compound with a strong human safety record in healthy adults and a growing body of evidence for its longevity and metabolic benefits.
But in April 2026, a landmark peer-reviewed study from Case Western Reserve University's School of Medicine was published that changes the picture significantly for one specific group — people with active cancer or undergoing cancer treatment. We think our customers deserve to know about this research. We are publishing this article in the interests of transparency, not to alarm, but to inform. Read the evidence. Talk to your doctor.
Does NMN Cause Cancer in Healthy People?
Short answer: No — current evidence does not support this.
Current evidence does not show that NMN causes cancer. No randomised controlled trial in humans has demonstrated that NMN supplementation causes tumour formation or increases cancer incidence. In long-term rodent research, mice treated with NMN did not develop more tumours than untreated animals.
This is the question that circulates most frequently in online discussions about NMN — and it's worth addressing clearly and honestly. The concern arises from a valid biological observation: cancer cells, like all cells, need NAD+ to survive and function. If NMN raises NAD+ levels, could it feed cancer cells? In theory, yes. In practice, the question is more nuanced.
Cancer is a complex, multifactorial disease, primarily driven by genetic mutations, environmental exposures and lifestyle factors — not the availability of NAD+. Like all cells, cancer cells rely on NAD+ for their growth and survival, but this does not mean NAD+ causes cancer. The same logic applies to glucose (sugar), oxygen, B vitamins, zinc and iron — all of which are essential for cell function and all of which cancer cells also depend on. We do not conclude that these cause cancer.
Human clinical evidence — including decades of research on NAD+ precursors like niacin, nicotinamide, NR and NMN — has found no association with increased cancer risk. Some studies have found the opposite — for example, a large Australian RCT found that nicotinamide supplementation significantly reduced the incidence of non-melanoma skin cancer.
Research: NMN safety in healthy humans
Yamaguchi et al. (2024) — Long-term NMN safety in healthy middle-aged men · Endocrine Journal
8-week clinical trial in healthy middle-aged Japanese men. NMN supplementation was well-tolerated. NAD+ levels increased in peripheral blood cells. No significant adverse effects observed. No cancer signals.
doi.org/10.1507/endocrj.ej23-0431 →Toxicology study profile of NMN — acute and 90-day sub-chronic dosing · Current Research in Toxicology (2024)
Comprehensive toxicology and mutagenicity testing in Wistar rats. NMN showed no mutagenic activity in standard mutagenicity tests. No carcinogenic signals identified.
doaj.org →NMN and lung cancer mouse model (2021) · RSC Medicinal Chemistry
NMN supplementation did not prevent lung cancer formation — but did not promote tumour growth either. NMN did not increase tumour incidence or tumour volume in this model.
RSC 2021 →NMN and colorectal cancer protection · MedComm (December 2024)
NMN supplementation reduced inflammatory cytokine levels and oxidative tissue damage in a colitis-associated cancer (CAC) model. Suggested a protective effect against colorectal tumour development in this specific context.
doi.org/10.1002/mco2.70006 →Summary — Question 1: The evidence leads to a clear but nuanced conclusion. For healthy people with no known malignancy, NMN supplementation does not cause cancer. Rodent studies show no excess tumour formation, and human data contain no carcinogenicity signals. NMN may actually support DNA repair mechanisms that help prevent cancerous mutations from arising. The concern is different — and it applies specifically to people who already have cancer or are being treated for it.
Should Cancer Patients Avoid NMN?
Short answer: Yes — consult your oncologist before taking NMN or any NAD+ precursor if you have active cancer or are undergoing treatment.
A landmark peer-reviewed study published in Cancer Letters in February 2026 found that NMN, NR and nicotinamide (NAM) helped pancreatic cancer cells resist three standard chemotherapy drugs. This is the most important recent finding on this topic and is discussed in full below.
Why NAD+ Is the Problem — Not the Supplement Itself
To understand why NMN could be problematic during cancer treatment, you need to understand what chemotherapy is actually trying to do.
Most chemotherapy drugs work by damaging cancer cells' DNA and inducing apoptosis — programmed cell death. They create oxidative stress inside cancer cells, break DNA strands and trigger cell death signals. Cancer cells can hijack NAD+ fuel to power up their energy systems, repair DNA damage from chemotherapy and avoid the cell death that chemo triggers, allowing tumours to survive doses that should be lethal.
THE MECHANISM — WHY NMN MAY PROTECT CANCER CELLS
LANDMARK STUDY — FEBRUARY 2026
Nakazzi et al. (2026) — "Vitamin B3 Derivatives Support Pancreatic Cancer Cell Survival and Chemotherapy Resistance"
Cancer Letters, Volume 645, 2026. Case Western Reserve University School of Medicine.
Among the compounds tested, NMN exhibited the strongest protective effect on cancer cells, enhancing resistance to oxaliplatin, 5-fluorouracil and gemcitabine in vitro. Mechanistically, NAD+ precursors promoted mitochondrial function, reduced oxidative stress and suppressed DNA damage and apoptosis in treated cancer cells — all contributing to chemotherapy resistance.
The team recommends routine screening of supplement use among cancer patients and calls for further clinical studies to better understand how NAD+ supplements interact with cancer therapies. The lead researcher advises patients to speak with their oncologist and care team about any supplements they are taking.
ADDITIONAL RESEARCH — APRIL 2025
AACR Annual Meeting 2025 Abstract — NMN and UV-Induced Skin Cancer
Research presented at the American Association for Cancer Research Annual Meeting 2025 (Chicago, April 2025) investigated NMN supplementation in UV-induced skin cancer models, finding NMN enhanced proliferation and aggressiveness in UV-induced skin cancer. This is a preliminary abstract — not a full peer-reviewed publication — and should be interpreted cautiously. It does, however, add to the picture that in the presence of existing cancer, NMN may not be beneficial.
doi.org/10.1158/1538-7445.AM2025-4168 →Important Nuances — What This Research Does and Doesn't Mean
The research above is serious and should be taken seriously — but context matters:
The 2026 study focused on pancreatic cancer specifically. It does not confirm the same effect exists in all cancer types. Different cancers have different metabolic profiles. What applies to pancreatic ductal adenocarcinoma may not apply uniformly across all malignancies — but the principle of NAD+ fuelling cancer cell survival is a general concern.
The study was conducted in laboratory cells and mouse models — not in human cancer patients. Laboratory findings do not always translate directly to human outcomes. Clinical trials in cancer patients are needed to confirm the effect at clinical doses. The study's authors themselves call for further clinical studies.
Some research shows NMN may be beneficial in certain cancer contexts. A 2024 study in MedComm found NMN reduced inflammatory cytokine levels and may protect against colorectal cancer development. A study in triple-negative breast cancer found NMN reduced tumour growth and metastasis. The picture is genuinely complex and cancer-type specific.
The complexity is precisely why cancer patients must not self-supplement. The interaction between NMN and cancer biology is cancer-type specific, treatment-specific and individual. Only your oncologist, who knows your specific cancer type, stage and treatment protocol, can advise you on whether any supplement is safe to take during treatment.
The bottom line on Question 2:
NMN can fuel tumour resilience, blunt the effect of chemotherapy drugs and awaken residual disease after surgery. Always consult your oncologist before even considering it. This is not a theoretical concern. It is supported by a peer-reviewed 2026 study in a major oncology journal. If you are being treated for cancer, please tell your medical team about every supplement you take.
What This Means If You're Healthy and Take NMN
In healthy people with no known malignancy, NMN supplementation does not cause cancer. The evidence consistently shows NMN is safe for healthy adults at standard doses. Human clinical trials have found no carcinogenic signals. Mutagenicity testing has found no mutagenic activity. Long-term rodent studies show no increase in tumour formation.
NMN's role in supporting DNA repair mechanisms — via NAD+-dependent PARP enzymes and sirtuins — may actually contribute to cancer prevention by maintaining genomic stability. This is an area of active research.
However, the risk only emerges if malignant cells are already present — which is why regular health checks, awareness of cancer risk factors and early detection remain the most important considerations. If you have concerns about cancer risk, speak to your GP. Food supplement — not a medicine.
Summary — NMN and Cancer: What the Evidence Says
| Question | Evidence | Guidance |
|---|---|---|
| Does NMN cause cancer in healthy people? | No human or animal study shows NMN causes cancer. Mutagenicity tests negative. Long-term rodent studies show no tumour increase. | No evidence it does. Safe for healthy adults at standard doses. |
| Can NMN fuel existing cancer cells? | Yes — theoretically and demonstrated in lab/mouse models. Cancer cells use NAD+ like all cells do. | Theoretical concern — but biologically logical. Context-dependent. |
| Should cancer patients take NMN? | 2026 Case Western study (Cancer Letters) found NMN strongest chemo-resistance factor in pancreatic cancer. AACR 2025 abstract suggests skin cancer aggressiveness increased. | Do not take without consulting oncologist. Discuss all supplements with cancer care team. |
| Does NMN protect against chemotherapy side effects? | Some patients take NAD+ precursors for chemo side effects. The 2026 study found this may simultaneously protect cancer cells — the opposite of the intended effect. | Do not self-supplement for chemo side effects without oncologist guidance. |
| Is the research settled? | No. Research is ongoing. Some studies show NMN protective in specific cancer contexts. The picture is complex, cancer-type specific and evolving. | Consult oncologist. Do not self-manage. Follow the clinical evidence as it develops. |
A Note on Our NMN Products
Charge Products sells NMN supplements to healthy adults. We continue to sell them. The research on NMN for healthy ageing, metabolic function, NAD+ replenishment and physical performance is strong and growing.
We are publishing this blog because we believe our customers deserve to know about emerging research — including research that complicates the picture. Transparency is more important to us than sales. All our NMN product pages carry warnings that customers should consult a GP before use and that food supplements are not medicines.
Our NMN products are intended for healthy adults. If you have cancer, a history of cancer or are undergoing any cancer treatment — do not take NMN without explicit guidance from your oncologist.
📚 Full Research References — All Sources Linked
Studies Suggesting Caution for Cancer Patients
Nakazzi et al. (February 2026) — Vitamin B3 derivatives support pancreatic cancer cell survival and chemotherapy resistance · Cancer Letters · Case Western Reserve University
NMN, NR and NAM protected pancreatic cancer cells from oxaliplatin, 5-fluorouracil and gemcitabine. NMN showed the strongest protective effect.
doi.org/10.1016/j.canlet.2026.218334 →AACR Annual Meeting Abstract 4168 (April 2025) — NMN supplementation enhances proliferation and aggressiveness in UV-induced skin cancer
Preliminary abstract — not yet a full peer-reviewed study. Presented at AACR Annual Meeting 2025, Chicago.
doi.org/10.1158/1538-7445.AM2025-4168 →Yoshino et al. — NAD+ metabolites in cancer patients undergoing surgery · Scientific Reports (2024)
Found NAD+ and related metabolites altered in cancer patients. Noted that excessive NAD+ increase may contribute to cancer growth.
nature.com/articles/s41598-024-66004-1 →Studies Suggesting Safety in Healthy Individuals
Yamaguchi et al. (2024) — Safety and efficacy of long-term NMN supplementation in healthy middle-aged men · Endocrine Journal
doi.org/10.1507/endocrj.ej23-0431 →Toxicology study profile of NMN — acute and 90-day sub-chronic dosing · mutagenicity tests · Current Research in Toxicology (2024)
doaj.org →NMN and lung cancer mouse model — NMN did not promote tumour growth (2021) · RSC Medicinal Chemistry
RSC 2021 →Studies Suggesting Potential Protective Effects in Specific Cancer Contexts
Li et al. (December 2024) — NMN protects STAT1 from oxidative stress to prevent colorectal tumorigenesis · MedComm
NMN reduced inflammatory cytokines and oxidative tissue damage in colitis-associated cancer model — suggesting protective role in colorectal cancer.
doi.org/10.1002/mco2.70006 →Australian RCT — Nicotinamide supplementation significantly reduced incidence of non-melanoma skin cancer
Large randomised controlled trial. Nicotinamide (a related NAD+ precursor) reduced non-melanoma skin cancer incidence — demonstrating that context matters considerably.
