Let me be straight with you: NAD+ (nicotinamide adenine dinucleotide) might be the single most important molecule in your body that you've never heard of. It's a coenzyme found in every living cell, and it's essential for energy production, DNA repair, gene regulation, immune function, and cellular communication. Without adequate NAD+, your mitochondria (the powerhouses generating energy for everything you do) start to sputter like an engine running on fumes.

Here's where the science gets personal. A comprehensive review in Integrative Medicine confirmed that by middle age, NAD+ levels plummet to roughly half of youthful concentrations. This decline has been observed across multiple species and correlated with virtually every hallmark of ageing, from mitochondrial dysfunction to genomic instability to chronic inflammation.

And just this March, a landmark expert review published in Nature Aging brought together more than 25 leading scientists from institutions including the University of Oslo, Harvard, and MIT. Their conclusion was striking: NAD+ sits at the centre of ageing biology, and declining levels are directly linked to neurodegenerative diseases like Alzheimer's and Parkinson's, cardiovascular disease, metabolic dysfunction, and cancer.

What makes this especially frustrating is that lifestyle factors can accelerate the decline. Chronic stress, poor sleep, excessive alcohol, ultra-processed diets, and sedentary behaviour all drain NAD+ faster. Your body is fighting an uphill battle, and the standard medical establishment is barely acknowledging it. This is exactly the kind of upstream, root-cause health information I believe everyone deserves access to.

NMN (nicotinamide mononucleotide) is a naturally occurring molecule that your body uses as a direct precursor to make NAD+. It's found in tiny amounts in foods like broccoli, avocado, edamame, and cabbage, but nowhere near the therapeutic doses being studied. When you supplement with NMN, your body converts it into NAD+ through well-characterised enzymatic pathways. Think of it as refuelling the tank that keeps your cellular engine running.

A January 2026 randomised clinical trial involving 65 healthy adults found that 1,000mg daily of NMN doubled circulating NAD+ levels within 14 days, performing comparably to NR (nicotinamide riboside) and significantly outperforming standard nicotinamide. A 2024 double-blind, placebo-controlled study in older adults (65 to 75) showed that 250mg daily of NMN for 12 weeks maintained walking speed, increased blood NAD+ levels, and improved sleep quality compared to placebo.

The regulatory picture has also shifted dramatically. In September 2025, the FDA reversed its 2022 position and confirmed that NMN is lawful for use in dietary supplements after the Natural Products Association filed both a citizen petition and a federal lawsuit. This ended three years of regulatory uncertainty and reopened the market.

A word of caution that I think is essential: NMN reliably raises NAD+ levels in humans, and there are early signals for improved physical function, insulin sensitivity, and metabolic health. But the marketing has gotten way ahead of the science. Claims like "reverse your age" or "extend your lifespan" are currently unsubstantiated in human studies. The research is promising, the trajectory is exciting, and I believe this molecule matters enormously, but intellectual honesty demands we acknowledge what we know and what we're still waiting to confirm.

I always say this: supplements are one piece of the puzzle, never the whole picture. The most powerful thing you can do for your NAD+ levels involves a combination of targeted nutrition, strategic lifestyle habits, and, if appropriate, quality supplementation. Here's a protocol built entirely on peer-reviewed evidence that you can start implementing today.

Step 1: Fix the foundation with NAD+ precursor foods. Your body synthesises NAD+ from vitamin B3 in its various forms. Foods rich in these precursors include pasture-raised chicken and turkey (niacin), wild-caught salmon and tuna (niacin and tryptophan), grass-fed beef liver (among the highest NAD+ precursor concentrations), avocados, edamame, and broccoli (contain trace NMN directly). Prioritising these whole foods gives your body the raw materials to produce NAD+ naturally.

Step 2: Activate your body's NAD+ recycling with exercise. A 2025 review in Nutrients confirmed that both aerobic exercise and resistance training upregulate the NAMPT enzyme, which is the rate-limiting step in your body's NAD+ salvage pathway. Translation: regular movement literally tells your body to make more NAD+. Aim for 150 minutes of moderate activity weekly, including at least two resistance sessions.

Step 3: Use time-restricted eating to boost NAD+ naturally. Research shows that intermittent fasting activates sirtuins, the NAD+-dependent enzymes responsible for DNA repair and metabolic regulation. A 14 to 16 hour overnight fast (finishing dinner by 7pm and eating again at 9 to 11am) is the most accessible and well-studied approach. This alone can meaningfully support NAD+ preservation.

Step 4: Protect the NAD+ you already have. An enzyme called CD38 breaks down NAD+ in your body, and its activity increases with age and chronic inflammation. Research published in Aging Cell highlights that reducing systemic inflammation through whole food diets, quality sleep (7 to 9 hours), stress management, and cutting processed seed oils can slow CD38 activity and preserve the NAD+ your body is already producing. Compounds like apigenin (found in parsley and chamomile tea) and quercetin (found in onions and apples) have shown CD38-inhibiting properties in preclinical studies.

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