What is NAD+, in plain terms?
NAD+ stands for nicotinamide adenine dinucleotide. It’s a coenzyme present in every cell, and it acts as a kind of cellular workhorse: it helps convert the food you eat into usable energy, and it fuels enzymes involved in DNA repair and the cell’s response to stress.
That basic biology is real, well-established and important. The complication is that the popular conversation around NAD+ often stretches well beyond what the science currently supports.
Why is NAD+ suddenly everywhere?
The surge in interest isn’t hard to understand. People are increasingly focused on longevity, prevention and quality of life over time, not just treating problems once they appear, but maintaining energy, mobility and resilience as they age.
NAD+ slots neatly into that conversation because it sounds scientifically credible and is tied to fundamental cellular function. Some of the most-cited early work came from Australia: researchers at UNSW Sydney, working with Harvard, showed that boosting NAD+ (via a precursor called NMN) improved DNA repair in ageing mice, a finding that drew global attention and helped kick off the modern NAD+ boom. You can read UNSW’s own write-up of that landmark research here.
Australian labs continue to investigate the NAD+ pathway today. For example, the Laboratory for Ageing Research at UNSW studies how NAD+ metabolism relates to ageing, fertility and the side effects of chemotherapy.
What does the science actually say?
Here’s where precision matters. Scientific interest in NAD+ does not automatically translate into simple consumer answers.
The current state of the evidence can be summarised fairly bluntly:
- NAD+ levels do appear to decline with age, though this varies between tissues and the picture is complex.
- Oral precursors like NMN and NR can raise NAD-related markers in human blood and some tissues. That part is reasonably well supported.
- What those raised markers mean for real-world outcomes (energy, strength, longevity, “feeling younger”) is much less certain. Human trials are mostly small and short, and results for things like muscle strength and physical function have been mixed or unimpressive.
For a balanced, evidence-first overview written for a general audience, this explainer on The Conversation is a good starting point. And Australian dietitian Tim Crowe’s review at Thinking Nutrition walks through the human trial data and concludes that, for now, the evidence for a meaningful anti-ageing benefit is largely unproven.
The honest takeaway: real, interesting science is happening, but a lot of the marketing has run ahead of what the evidence can currently support.
NAD+ and the rise of “longevity thinking”
It helps to place NAD+ inside the broader cultural shift it belongs to. People are no longer interested only in treating problems when they appear. They’re also interested in prevention, optimisation and long-term resilience.
That shift explains why NAD+ has become such a fashionable topic. It sits at the crossroads of science, ageing and aspiration. The challenge for readers is separating the credible biology from the aspirational marketing wrapped around it.
What to know before buying NAD+ or NMN products in Australia
A few practical points worth keeping in mind:
- Supplements are regulated as medicines here. In Australia, vitamins and complementary medicines (including most NAD+ and NMN products) are regulated by the Therapeutic Goods Administration (TGA). “Natural” or “available without a prescription” does not automatically mean proven or risk-free. See the TGA’s guidance on complementary medicines.
- Look for an AUST L or AUST R number on the label, and check it on the Australian Register of Therapeutic Goods. Products bought from overseas websites generally aren’t regulated by the TGA.
- Be sceptical of bold promises. Claims about reversing ageing, dramatically boosting energy, or extending lifespan go well beyond what human evidence currently supports.
- The basics still win. Regular exercise, good sleep, a balanced diet, not smoking and limiting alcohol have far stronger evidence for healthy ageing than any NAD+ product on the market today.
- Talk to a health professional before starting any supplement, especially if you’re pregnant, on medication or managing a health condition.
FAQ
What is NAD+?
NAD+ is a coenzyme involved in cellular energy metabolism and other important biological processes.
Why is NAD+ so popular in wellness?
Because it is linked to ageing, energy, and longevity, which are major interests in the wellness market.
Do NAD+ supplements or infusions work the way marketing suggests?
The evidence is still developing, and many claims go beyond what is currently established.
Are NAD+ supplements regulated in Australia?
Yes. They’re regulated as complementary medicines by the TGA. Products sold from international websites, however, often fall outside that regulation.
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Written by: The Astrid Clinic Editorial Team
Clinically reviewed by: Nurse Liv
Published: June 2026
