The quest for eternal youth has led many to explore the world of longevity supplements, but do these products truly deliver on their promises? Let's dive into the facts and uncover the truth.
The Allure of Longevity Supplements: Fact or Fiction?
You've probably seen influencers raving about supplements that claim to "repair DNA" and "fight ageing." These supplements often come with acronyms like NRC, NMN, and TMG, which sound impressive but what do they actually do?
NRC (nicotinamide riboside chloride) and NMN (nicotinamide mononucleotide) are precursors or "building blocks" for NAD (nicotinamide adenine dinucleotide), a natural molecule in our bodies. Trimethylglycine (TMG) is another ingredient sometimes added to "support" these compounds.
Proponents of these supplements claim they "boost vitality" and "improve cellular health." But do they live up to these claims? Let's find out.
Unraveling the Claims: What Does the Evidence Say?
While clever marketing makes these supplements sound like a miracle cure, the reality is more complex. Prof. Oliver Jones, an expert in analytical science, sheds light on the matter. He explains that NAD is involved in various chemical reactions, including energy production and DNA repair. However, the idea that providing precursor compounds can boost NAD production is not as straightforward as it seems.
"The likelihood that any single compound among the thousands in our bodies is responsible for all ageing is practically zero," Jones emphasizes. Even if NAD concentrations decline with age, it doesn't necessarily mean that this decline causes ageing. There are numerous biochemical changes associated with ageing, but they are not the root cause.
One Instagram ad claims that a particular supplement can increase NAD levels by 51% in just 14 days. However, Prof. Jones cautions that such increases in a single biomarker may not translate to meaningful health improvements.
"A 51% increase sounds impressive, but it only means your original concentration went up by half. For instance, if you start with 0.25mg, a 51% increase only gives you 0.38mg, which isn't a significant difference. Percentages can be misleading," he explains.
The crucial question, according to Jones, is not whether NAD concentrations increase but whether such an increase matters for our health and longevity.
Prof. Bruce Neal, a physician and executive director of the George Institute for Global Health, agrees. He emphasizes the need for large, well-designed trials to demonstrate real outcomes, such as reduced heart attacks, improved physical function, and longer lifespans. Unfortunately, such evidence is lacking for these longevity supplements.
The Lack of Human Studies: A Cause for Concern?
Danielle Shine, an accredited dietitian and nutritionist, highlights that much of the enthusiasm for longevity products is based on animal studies, mainly involving rodents. However, she cautions that these studies rarely translate reliably to humans, especially for complex outcomes like ageing and long-term health.
"We're not rodents; we metabolize compounds differently, live in diverse environments, and age uniquely," Shine emphasizes. While a few small NMN studies in adults aged 40-65 reported minor improvements in energy and walking distance, there's no evidence that these short-term changes lead to long-term health benefits or increased lifespan.
Prof. Neal adds that combining ingredients in the hope of finding the right "stack" is just a clever way to get people to spend more on products that may not provide any real health benefits. He warns against the idea that supplements can offset unhealthy habits like excessive drinking or smoking.
So, What Truly Promotes Longevity?
Shine highlights that maintaining a healthy, balanced diet, staying hydrated, exercising (including resistance training), getting sufficient sleep, managing stress, nurturing social connections, avoiding harmful substances, and protecting your skin with broad-spectrum sunscreen are all key factors in promoting longevity.
"Keeping up with preventative healthcare, including vaccinations, routine check-ups, and evidence-based screening tests, is also vital," she adds. "No supplement can match or replace these fundamental habits for supporting overall health and longevity."
So, while the allure of longevity supplements is strong, the evidence suggests that a holistic approach to health and wellness is the true path to a longer, healthier life.
