Vitamin B3 and Anti-Aging Supplements May Help Cancer Cells Survive

New research indicates that certain popular vitamin B3 derivatives, often marketed as anti-aging supplements, may inadvertently help cancer cells survive and resist chemotherapy treatment.

The study, led by researchers at Case Western Reserve University School of Medicine and published in the journal Cancer Letters on April 1, 2026, focused on how NAD+ precursor supplements affect pancreatic cancer.

Pancreatic cancer is among the deadliest forms of the disease, with a five-year survival rate of 13% according to the American Cancer Society.

The Role of NAD+ Precursors

Millions of people use supplements such as nicotinamide mononucleotide (NMN), nicotinamide riboside (NR) and nicotinamide (NAM) to protect the brain and heart, boost energy levels, and slow the aging process.

Some cancer patients also use these supplements to manage the side effects associated with chemotherapy.

These supplements are precursors to NAD+, a molecule required for the function and survival of every cell in the body, including both healthy and cancerous cells.

While these supplements may provide benefits for healthy individuals, the research suggests that cancer cells can hijack the fuel provided by NAD+ supplements to power their own energy systems.

Impact on Chemotherapy Effectiveness

The study found that these vitamin B3 derivatives can help cancer cells repair DNA damage caused by chemotherapy and avoid the cell death that chemotherapy is intended to trigger.

This process allows tumors to survive doses of chemotherapy that would otherwise be lethal.

Using laboratory experiments and mouse models, researchers observed that these supplements—and NMN in particular—shielded pancreatic cancer cells from three standard chemotherapy drugs:

• Oxaliplatin
• 5-fluorouracil
• Gemcitabine

The research identified three critical ways these supplements undermine treatment, including boosting the energy of cancer cells to make tumors more resilient and stronger.

Scientific Implications

The findings raise significant questions regarding the use of NAD+ supplements during cancer treatment, suggesting that the unintended consequences of these compounds may outweigh their perceived benefits in a clinical oncology setting.

By flooding the body’s cells with fuel, these supplements may provide the very resources cancer cells need to resist medical intervention.