Can NAD Supplements Hack Aging?

Understanding NAD Supplements and Their Claims

As you walk through the supplement aisle at your local drugstore, you might come across a variety of NAD (nicotinamide adenine dinucleotide) products, including pills, powders, and liquids. These supplements often promise to slow down the aging process and enhance overall health. The global market for such products reached $535.53 million in 2022, highlighting their growing popularity. But do these supplements actually deliver on their promises?

Dr. Nicholas Dragolea, a London-based general practitioner with an interest in longevity and functional health, notes that while patients occasionally ask about NAD supplements, there isn’t enough medical evidence to support their use. This skepticism is echoed by many experts in the field.

What is NAD and Why Is It Hyped?

NAD is a molecule naturally produced by the body from nutrients like tryptophan and niacin. It plays a crucial role in various bodily functions, including metabolism, brain health, and DNA repair. According to Daniel Craighead, an assistant professor in the School of Kinesiology at the University of Minnesota Twin Cities, NAD levels tend to decrease as we age. This has led to the idea that restoring NAD through supplements could potentially reverse signs of aging.

Insights from Scientific Research

In 2023, Craighead and his colleagues reviewed research on oral NAD precursors and their effects on healthy aging and age-related chronic diseases. Many supplements contain NAD precursors such as nicotinamide riboside and nicotinamide mononucleotide, which are more stable and converted into NAD by the body.

Lab studies in cells and mice have shown promising results, suggesting that NAD may promote healthy aging and aid in DNA repair. However, human studies present a more mixed picture. Most of these studies are short-term and involve small groups, typically a few dozen people. While they show that NAD+ precursors are safe and can boost NAD+ levels, significant health improvements are not consistently observed.

Craighead highlights that the best evidence suggests these NAD precursors may reduce inflammation. A 2019 study found that three weeks of nicotinamide riboside supplementation reduced blood markers of inflammation by 50% to 70% in older men. Chronic inflammation is a key factor in aging and age-related diseases, making this result promising.

Another review published in 2024 noted potential benefits for neurological conditions like Parkinson’s and Alzheimer’s disease, though further clinical trials are needed. One study included in the review showed that oral nicotinamide riboside increased brain NAD levels and altered brain metabolism in individuals with Parkinson’s disease. It also reduced inflammatory cytokines in the blood and cerebrospinal fluid of participants.

In a 2004 study, patients with Alzheimer’s disease who took NAD supplements showed improvements in cognitive functions, such as verbal fluency and abstract reasoning.

Expert Opinions and Cautionary Advice

While some clinicians report anecdotal benefits, many experts remain cautious. Dr. Heather Hinshelwood, co-owner and chief of medicine at Fraum Health, mentions that her patients often experience improved energy when starting daily low-dose NAD injections. She also notes that some dementia patients show better cognition than their spouses.

However, Dr. David S. Seres, a professor of medicine at Columbia University Medical Center, emphasizes that there is no high-quality evidence supporting the health benefits of NAD supplementation. He advises against taking any dietary supplements without strong evidence from well-conducted randomized trials.

Safety Considerations

Current human studies suggest that NAD supplements are generally safe. However, Dr. Seres warns that safety assumptions based on weak evidence can be dangerous. He cites the example of vitamin E and selenium, where early research suggested benefits, but later trials found increased risks.

“You cannot assume that supplements are effective or safe based on the kind of evidence used to make claims such as ‘supports energy’ or ‘supports healthy aging,’” says Seres.

Final Thoughts

For now, NAD supplements are not a proven tool for healthy aging. Craighead recommends longer studies with more participants to draw definitive conclusions. If you still decide to try NAD supplements, be aware that not all products contain what their labels claim. A 2024 analysis found that many nicotinamide mononucleotide (NMN) products contained far less of the active ingredient than advertised, potentially leading consumers to waste money on ineffective products.