NAD+ and NMN Supplements: What NZ Over-50s Should Know

If you’ve been reading about supplements for healthy ageing, you’ve almost certainly met NAD+ and its precursors NMN and NR. They arrive wrapped in impressive language — “cellular energy”, “longevity molecule”, “switching on your youth genes” — and a price tag to match. Patients ask me about them often, usually some version of the same question: are they actually worth it?

I’m Dr Roderick Mulgan, an Auckland GP and the founder of Lifeguard Health. This is a straight answer, not a sales pitch. Lifeguard doesn’t sell an NAD+ product, and by the end of this you’ll understand why. Here’s what NAD+ and NMN really are, what the evidence does and doesn’t show for adults 45+, and what I’d spend the money on instead.

The short answer

NAD+ is a genuinely important molecule — the biology is real and interesting. But the leap from “important molecule” to “take this capsule and feel younger” is where the marketing runs well ahead of the human evidence. For most Kiwis over 50, the honest position is: the science is promising but early, the human trials are small and short, and your money buys more proven benefit in the basics — sleep, movement, and covering the everyday nutrient gaps that genuinely widen with age.

What NAD+, NMN and NR actually are

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every cell in your body. It’s central to how cells turn food into energy and to a set of repair and maintenance processes. It’s not exotic — it’s fundamental housekeeping, and your body makes it from ordinary B3 (niacin) in the diet.

NAD+ levels do appear to fall as we age, and that observation is the whole engine of the industry. The theory: top NAD+ back up and you might support the cellular machinery that slows down with age. Because NAD+ itself is a large molecule that isn’t well absorbed as a pill, supplements instead sell the precursors — the raw materials your body uses to build NAD+:

• NMN (nicotinamide mononucleotide) — one step from NAD+; the current darling.
• NR (nicotinamide riboside) — a step further back; the other main form, sold internationally as Niagen.
• Plain niacin / nicotinamide (B3) — the cheap, long-established precursor that’s already in most multivitamins.

That last point is worth sitting with: the expensive molecules are premium routes to something a few cents of B3 also feeds into.

What the evidence actually shows

Here’s where I have to be honest with you, because the gap between the headlines and the data is large.

The animal studies are striking. In mice, NMN and NR can raise NAD+ levels and improve various markers of ageing and metabolism. This is the source of nearly every dramatic claim you’ve read.

The human studies are early, small and modest. Trials in people do show that these precursors can raise NAD+ levels in the blood — so they “work” in the narrow sense of doing what they say to the chemistry. What they have not reliably shown is that this translates into the outcomes people actually care about: more energy, sharper memory, a longer or healthier life. The human trials are mostly a few weeks to a few months, in small groups, measuring surrogate markers rather than how people feel or function. Mice are not people, and a molecule moving on a blood test is not the same as a benefit you’d notice.

That’s not me dismissing the field — it’s a legitimately interesting area of research and it may yet prove itself. It’s me telling you where it stands today: interesting, unproven for everyday benefit, and priced as though the question is settled when it isn’t.

Is it safe?

Short-term human trials of NMN and NR at typical doses have generally reported good tolerability, with no major safety signals in the studies done so far. But “no problems found in small short studies” is not the same as “proven safe to take daily for years” — the long-term data simply doesn’t exist yet. If you’re on medications, have a health condition, or are being treated for cancer, talk to your own GP before starting any NAD+ precursor, as the interactions and long-term effects aren’t fully mapped.

Where the money is better spent

If your real goal is to age well — steadier energy, a clearer head, staying strong and independent — here’s where the evidence is genuinely solid, and where I’d put the same budget:

• Sleep. Nothing you can buy protects an ageing brain and body like consistent, decent sleep. It’s free, and it’s the highest-value habit in midlife.
• Strength and movement. Resistance training twice a week does more for energy, metabolism and brain health than any longevity capsule on the market.
• The everyday nutrient gaps that widen with age. This is the unglamorous but well-evidenced part. B12 absorption falls after 50 and a deficiency directly clouds thinking and drains energy. Vitamin D is widely low across New Zealand, especially through winter. Omega-3 supports brain and heart health. These aren’t exciting, but they’re real, common, and cheap to cover.

None of that requires a longevity molecule — and paying premium NMN prices can quietly crowd out the cheaper, better-evidenced basics that actually move the needle.

That thinking runs through the range. Lifeguard Essentials is a doctor-formulated, NZ-made daily base built around anti-inflammatory and antioxidant botanicals — Meriva turmeric, boswellia, olive leaf and grape seed — because low-grade inflammation and oxidative stress are among the better-understood drivers of how we age, the brain included. And if the winter vitamin D gap is your concern, that sits in Lifeguard Immune alongside vitamin C, zinc and selenium. No hype, no “longevity” markup — the basics done properly.

So should you take NAD+ or NMN?

If you’re curious, financially comfortable with an experiment, and you go in clear-eyed that you’re backing an early hypothesis rather than a proven benefit — that’s a reasonable adult choice, and the short-term safety data is reassuring. What I’d caution against is spending meaningful money on NMN instead of the sleep, movement and basic nutrition that are proven to help, on the strength of marketing that implies the science is settled. It isn’t. Do the foundations first; treat NAD+ as an optional extra, not a substitute.

Where Lifeguard fits

Lifeguard doesn’t sell an NAD+ or NMN product, and I wouldn’t market one on today’s evidence. What we make is honest daily support — NZ-made, doctor-formulated, for adults 45+ — that covers the well-evidenced basics underneath good sleep, food and movement. For the fuller picture on protecting an ageing brain, read our brain health supplements in NZ guide; if your main concern is the mental fog that comes with menopause specifically, see our guide to menopause brain fog.

Supplements support good nutrition — they aren’t a substitute for medical care. If you’re worried about your memory, energy or a specific health condition, talk to your GP.

Not sure where to start? Explore the range to find the foundation that fits your stage — or start with Lifeguard Essentials as your daily base.

Frequently asked questions

Are NAD+ supplements worth it for over-50s in NZ?

The biology is real but the human evidence is early. Trials show NMN and NR can raise NAD+ levels, but they haven’t reliably shown the benefits people care about — more energy, better memory, longer healthy life. For most over-50s, the proven basics (sleep, exercise, and covering B12, vitamin D and omega-3 gaps) offer more certain value for the money.

What is the difference between NAD+, NMN and NR?

NAD+ is a coenzyme in every cell, central to energy and repair. NMN and NR are precursors — raw materials your body converts into NAD+. NAD+ itself isn’t well absorbed as a pill, so supplements sell the precursors. Ordinary B3 (niacin), already in most multivitamins, also feeds NAD+ production.

Are NMN and NR supplements safe?

Short-term human trials at typical doses have generally reported good tolerability with no major safety signals, but long-term data doesn’t yet exist. If you take medications, have a health condition, or are being treated for cancer, check with your GP before starting, as the long-term effects and interactions aren’t fully understood.

What should I take instead of NAD+ for healthy ageing?

Prioritise the well-evidenced foundations: consistent sleep, regular strength training, and covering the nutrient gaps that widen with age — B12 (absorption falls after 50), vitamin D (widely low in NZ, especially in winter) and omega-3. Lifeguard’s doctor-formulated range covers the daily basics without longevity-brand pricing: anti-inflammatory antioxidant support in Lifeguard Essentials, and vitamin D with vitamin C, zinc and selenium in Lifeguard Immune.