NAD+ supplement with resveratrol: what it is and how it works

I have been getting the same question in the pharmacy for months: "Jorge, does a NAD+ supplement really work or is it just another fad?" And my short answer is that NAD+ is not a fad at all. It is a coenzyme your body already makes, involved in more than 500 enzymatic reactions, and from around the age of 40 your levels drop sharply. The research behind it is well-evidenced. The problem is that marketing has turned it into "the molecule of eternal youth", which does it no favours.

In this article I will walk you through what the science says about NAD+, what I have seen when dispensing NAD+ supplements with resveratrol and nicotinamide riboside, and especially what you are not usually told. Because there are nuances that genuinely change your buying decision.

What NAD+ is and why everyone is talking about it

NAD+ stands for nicotinamide adenine dinucleotide. It sounds like something from a lab, but it is a molecule you have carried inside you since you were born. A NAD+ coenzyme is a key helper molecule that allows your mitochondria to convert what you eat into usable cellular energy. Without it, your mitochondria cannot do their job. It really is that straightforward.

The issue is that as you age, your NAD+ levels fall. A study published in Cell Metabolism showed that by the age of 60 you can have roughly half the NAD+ you had at 30. That decline correlates with fatigue, poorer muscle recovery, less elastic skin and a higher risk of metabolic diseases.

I explain it to customers like this: NAD+ is the fuel for your body’s repair machinery. Taking a NAD+ supplement will not suddenly knock ten years off your appearance. But you are giving your body back a tool it was gradually losing.

• NAD+ (nicotinamide adenine dinucleotide) is an essential coenzyme that enables mitochondria to turn food into cellular energy.
• NAD+ levels decline significantly with age, with around a 50% reduction reported between ages 30 and 60 in human studies.
• Lower NAD+ status has been associated with fatigue, slower recovery, reduced skin elasticity and increased metabolic disease risk.

How it works in your body (without waffle)

Here comes the part very few people explain properly. You cannot simply take NAD+ itself as an oral supplement and expect it to arrive intact inside your cells. The molecule is too large to cross the cell membrane just like that.

What does work are the precursors: smaller molecules that your body converts into NAD+ once they are inside the cell. The two main ones are:

NR (nicotinamide riboside)

This is the precursor with the most clinical trials in humans so far and often features in discussions of the best NAD supplement UK patients ask me about. It enters the cell and is converted into NAD+ via the NRK enzyme. A trial published in Nature Communications (2020) showed that 1,000 mg/day of NR increased blood NAD+ levels by about 60% in two weeks.

NMN (nicotinamide mononucleotide)

This sits one step further along the metabolic pathway. It works, but for years there was debate over whether it could enter cells directly. In 2019 the Slc12a8 transporter was identified, which settled that question. Even so, NR still has more accumulated clinical evidence in humans at this point.

My counter-advice in practice: if you want a NAD+ precursor supplement with solid scientific backing and good tolerability, NR is currently the option that convinces me most. And if you also add resveratrol on top, things tend to look even better.

• Oral NAD+ itself is poorly suited to raising intracellular levels because the intact molecule does not easily cross cell membranes.
• Nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN) are smaller precursors that cells convert efficiently into NAD+.
• Human trials show NR at doses around 1,000 mg/day can raise circulating NAD+ by roughly 60% within two weeks.

NAD+ and resveratrol: why they go together

This is the combination I am asked about most often when people search for anti-ageing supplements rather than just general vitamins. And there is real biochemical logic behind it; it is not just marketing spin.

Resveratrol directly activates SIRT1 (the best-studied sirtuin in longevity research). But SIRT1 needs NAD+ as a co-substrate to function properly. In other words: resveratrol presses the accelerator pedal, but without enough NAD+ there is no fuel. David Sinclair, the Harvard researcher who popularised this combination, described it exactly like this in his lab work.

A 2023 meta-analysis in Nutrients reviewed 17 trials using trans-resveratrol and found improvements in inflammatory markers (CRP), lipid profile and insulin sensitivity. When combined with NAD+ precursors, some preclinical studies show synergistic effects on expression of longevity-related genes.

But here comes the important nuance: most of these data are preclinical (mice) or small human trials. Long-term evidence in humans is still being built. I always say this clearly: it looks promising; it is not magic.

• Resveratrol activates SIRT1, a longevity-related enzyme that requires adequate NAD+ as a co-substrate to function.
• Meta-analyses of trans-resveratrol report benefits on inflammation markers, lipid profile and insulin sensitivity in humans.
• Preclinical models suggest combining resveratrol with NAD+ precursors may enhance expression of genes linked to healthy ageing.

NAD+ supplements I dispense in the pharmacy

At Farma2Go we stock two formulas that cover the two main approaches people look for when comparing different types of nicotinamide riboside supplement online. I have been dispensing them for months and customer feedback has been fairly consistent: better sleep quality, more energy on waking and, in some cases, an improvement in skin appearance. Not always, not in everyone, but there is definitely a pattern.

Which one to choose for your situation

If you are over 40 and want a broad approach (anti-ageing + cardiovascular support + energy), I would lean towards Nutralie with resveratrol. The synergy between NAD+ and resveratrol is well described in the literature and the pack of 60 capsules lasts one month at standard dosing.

If what you want is a pure NAD+ precursor without extras, at a clinically relevant dose, then Nullure NR at 300 mg is more direct. Clean nicotinamide riboside with no blends. Ideal if you already take resveratrol separately or if you only want to focus on supporting your NAD+ levels.

• NAD+ support can be provided either via combined formulas including resveratrol or via single-ingredient precursor capsules.
• Combined products aim at broader goals such as cardiovascular health, energy and skin support alongside cellular ageing pathways.
• Purer NR-only products suit people who already use other antioxidants or prefer to target NAD+ status specifically.

Contraindications and side effects

I am going to be very clear here because there is contradictory information online about who can safely use these products as an anti-ageing supplement strategy.

NAD+ precursors (NR and NMN) have shown a good safety profile in published trials. Doses up to 2,000 mg/day of NR have been well tolerated in studies lasting up to 12 weeks. But "well tolerated in a trial" does not mean "no precautions needed".

Side effects I have seen first-hand in the pharmacy: an occasional case of mild stomach discomfort with the first doses, which usually settles if you take the supplement with food. Nothing serious so far. But always speak to your doctor or pharmacist if you have any underlying medical condition before starting these products.

• NAD+ precursors such as NR and NMN appear generally well tolerated up to around 2,000 mg/day in short-term human studies.
• Caution is advised for pregnancy, breastfeeding, oncology patients, gout sufferers and people on immunosuppressive therapy due to limited data.
• Mild gastrointestinal discomfort is the most commonly reported side effect and often improves when taken with food.

Frequently asked questions about NAD+