NAD+ has become one of the most talked-about molecules in longevity science — appearing in everything from biohacking podcasts to mainstream health publications. But with so much noise around it, it can be hard to separate what's genuinely evidence-backed from what's hype.
Here's an honest, straightforward breakdown of what NAD+ actually is, what the research says it does, who is most likely to benefit from it, and how to approach supplementation intelligently.
What is NAD+?
NAD+ stands for Nicotinamide Adenine Dinucleotide. It's a coenzyme — a molecule that works alongside enzymes to make essential biological reactions happen — found in every single living cell in your body.
It plays a central role in some of your body's most fundamental processes. Energy production — NAD+ is essential to the process by which your mitochondria convert food into usable energy (ATP). Without adequate NAD+, cellular energy production becomes inefficient, which shows up as fatigue and reduced physical and cognitive performance. DNA repair — NAD+ activates a family of enzymes called PARPs, which detect and repair damaged DNA. This is one of the most critical anti-ageing mechanisms in the body. Gene expression — NAD+ activates sirtuins, a family of proteins that regulate inflammation, cellular stress responses, and longevity-associated pathways. Circadian rhythm — NAD+ levels naturally fluctuate throughout the day and play a role in regulating your body clock, affecting sleep quality, hormonal rhythms, and metabolic function.
In short, NAD+ is not a trendy wellness supplement. It is a fundamental molecule your body depends on to function — and one whose decline has serious, measurable consequences.
Why do NAD+ levels decline?
NAD+ levels decline naturally and significantly with age. Research suggests that levels drop by as much as 50% between your 40s and 60s. This decline is driven by several factors — your body consuming NAD+ faster than it can produce it as cellular demand increases with age; chronic inflammation consuming NAD+ as part of the immune response; DNA damage accumulating with age, increasing demand on NAD+-dependent repair enzymes; and lifestyle factors including poor sleep, excess alcohol, high sugar intake, and sedentary behaviour all accelerating the decline.
This decline is closely associated with many of the hallmarks of ageing — reduced energy, slower recovery, declining cognitive function, increased inflammation, and greater susceptibility to chronic disease.
What does the research say?
The science on NAD+ is genuinely compelling — and it's worth being honest about both what we know and where research is still developing.
In animal studies, NAD+ precursor supplementation has consistently shown benefits including improved energy metabolism, enhanced DNA repair, reduced inflammation, improved muscle function, and extended lifespan in some models. Human clinical trials are more recent and still ongoing, but early results are promising. Studies have shown that NAD+ precursor supplementation in humans measurably raises NAD+ levels in blood and tissues, improves markers of metabolic health, supports muscle function in older adults, and reduces markers of inflammation. The research is not yet at the stage where we can make sweeping claims about NAD+ reversing ageing in humans — but the mechanistic evidence is strong and the clinical data is growing.
What are NAD+ precursors?
Because NAD+ itself is not well-absorbed when taken orally, supplements typically use precursors — compounds your body converts into NAD+. The two most studied are NMN (Nicotinamide Mononucleotide) and NR (Nicotinamide Riboside). Both have shown the ability to meaningfully raise NAD+ levels in human studies, with NMN showing particularly strong results in recent trials.
Do you actually need it?
The honest answer is: it depends on where you are in life and what you're optimising for.
If you're under 35 and otherwise healthy, your NAD+ levels are likely still reasonably high and other lifestyle fundamentals — sleep, nutrition, exercise, stress management — will give you more return on investment than NAD+ supplementation.
If you're in your 40s or beyond, experiencing fatigue, brain fog, slower recovery, or reduced energy that isn't explained by other deficiencies, declining NAD+ is a plausible contributor and supplementation is worth considering. The same applies if you're focused on longevity and healthspan optimisation — the evidence base supports NAD+ as one of the more scientifically grounded interventions in that space.
If you have significant lifestyle factors that accelerate NAD+ decline — chronic poor sleep, high alcohol intake, high-stress work, sedentary lifestyle — addressing those will be more impactful than supplementation alone. NAD+ supplements work best as part of a broader approach, not a substitute for it.
How should you supplement NAD+?
Delivery method matters significantly. Oral supplements are the most accessible, but bioavailability varies considerably between products and formulations. IV NAD+ therapy delivers NAD+ directly into the bloodstream, bypassing the digestive system entirely and achieving much higher plasma levels than oral supplementation — this is particularly relevant for people seeking therapeutic rather than maintenance-level effects. Subcutaneous injections offer a middle ground between oral and IV in terms of convenience and bioavailability.
At Boost & Glow, we offer NAD+ across multiple delivery methods and can advise on the right approach for your goals, health status, and budget. We'd always recommend a health consultation before starting any NAD+ protocol — understanding your baseline health picture, including a blood test to check the markers most relevant to NAD+ metabolism, helps ensure you're supplementing in the right context.
The bottom line
NAD+ is not hype. It's a molecule with a well-established and critical role in human biology, whose decline with age has measurable consequences for energy, recovery, cognition, and longevity. The supplementation evidence, while still developing, is among the stronger bases in the longevity supplement space.
Whether you need it right now depends on your age, your symptoms, your lifestyle, and your health goals. The smartest approach is to understand your baseline first — then supplement with precision rather than guesswork.
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