The quest for eternal youth is as old as humanity itself, and in the modern era, it has taken a new form: the anti-ageing supplement. Among the most hyped compounds are NMN, NAD+, and resveratrol, each touted as the key to unlocking a longer, healthier life. But are these supplements the elixir of youth, or just another fad? Let's dive into the science and separate fact from fiction.
The Promise of NAD+, NMN, and Resveratrol
NAD+ (Nicotinamide Adenine Dinucleotide) is a coenzyme that plays a crucial role in energy metabolism, DNA repair, and cellular stress responses. As we age, NAD+ levels tend to decline, leading to reduced mitochondrial function and other age-related changes. This has sparked interest in NAD+ precursors like NMN (Nicotinamide Mononucleotide) and NR (Nicotinamide Riboside), which can be converted into NAD+ by the body. In animal studies, these compounds have shown promise in improving energy metabolism, insulin sensitivity, and physical function, as well as extending healthspan and lifespan.
Resveratrol, found in red grapes, berries, and peanuts, is another compound often promoted for its anti-ageing properties. In laboratory and animal studies, resveratrol has been linked to lower levels of inflammation and improved mitochondrial function. However, its oral bioavailability is poor, meaning that much of what is swallowed is broken down before it can reach tissues in the form and concentration used in experiments.
The Reality of Anti-Ageing Supplements
While the science behind these compounds is compelling, the reality of anti-ageing supplements is more nuanced. In humans, the evidence for meaningful benefits is still limited. NMN and NR can raise NAD+ levels in blood and tissues, but the strongest evidence is for changes in blood, while evidence for effects in specific tissues is still limited. Some small studies have reported possible benefits for metabolic health, but recent reviews have not found convincing evidence that NMN or NR preserve muscle mass or function in older adults.
Resveratrol, for its part, has not shown convincing evidence that it slows ageing in human trials. The gap between laboratory findings and real-world effects is significant, and the marketing of these supplements often overstates their benefits. While these compounds are not biologically implausible, affecting a pathway is not the same as slowing ageing in a person.
The Best-Supported Ways to Age Healthily
For now, the best-supported ways to support healthy ageing remain far less glamorous: regular exercise, good sleep, a balanced diet, avoiding smoking, limiting alcohol, and managing long-term health conditions. Supplements may eventually prove useful, but at present, the evidence for staying younger for longer is much stronger for everyday habits than for anti-ageing products.
Personal Reflection
Personally, I find the quest for eternal youth fascinating, but I'm also skeptical of the hype surrounding anti-ageing supplements. While the science behind NAD+, NMN, and resveratrol is compelling, the reality of their benefits in humans is still uncertain. The best-supported ways to age healthily remain the tried-and-true habits of a balanced diet, regular exercise, and good sleep. Until we have more evidence, I'll stick to these proven methods and leave the supplements to those who are truly convinced of their benefits.
