Nicotinamide adenine dinucleotide (NAD+) is a coenzyme found in every cell. It has two main jobs:
• Energy: it helps turn food into cellular energy in the mitochondria.
• Cell maintenance: DNA-repair and stress-response enzymes, including sirtuins and PARPs, need it to work [1].

How NAD+ helps your mitochondria make energy

Mitochondria are your cells' "power plants". NAD+ acts as a shuttle, carrying energy from food to the machinery that makes ATP, the energy cells use [1]:

1. Collect: in the Krebs cycle, NAD+ picks up electrons from food and becomes NADH.
2. Deliver: NADH passes the electrons to Complex I of the electron transport chain and turns back into NAD+.
3. Pump: as electrons move along the chain to oxygen, protons (H+) are pumped across the inner membrane.
4. Power: the protons flow back through ATP synthase, which uses that flow to make ATP.

Cells recycle NAD+ constantly, so they need a steady supply. When NAD+ falls, step 1 slows, less NADH reaches the chain and less ATP is made. Mitochondria also use NAD+ to power SIRT3, a sirtuin that helps maintain mitochondrial proteins [1].

The body makes NAD+ from dietary vitamin B3 (niacin, nicotinamide and nicotinamide riboside) and the amino acid tryptophan.

Why is NAD+ linked to ageing?

NAD+ levels in some tissues appear to fall with age. One study found lower NAD+ in older adults' skin [2], and reviews link falling NAD+ to mitochondrial decline and chronic low-grade inflammation [1].

In mice, raising NAD+ with precursors improved several markers of metabolic and muscle health [3]. Human research is newer, and scientists are testing whether these results carry over to people [10].

NR and NMN: popular NAD+ precursors, and what they do

Precursors are ingredients the body uses to make NAD+ inside its cells. The two most studied are:

• Nicotinamide riboside (NR): a form of vitamin B3, found in small amounts in milk.
• Nicotinamide mononucleotide (NMN): one step closer to NAD+, found in small amounts in broccoli, cabbage and avocado.

Both are sold as oral supplements and have become very popular. Many users report more energy, better sleep or faster recovery, though personal experiences vary and differ from controlled trial results.

Most human NAD+ trials have tested these precursors.

Encouraging results:

• NR raised blood NAD+ in healthy middle-aged and older adults and was well tolerated over six weeks [4].
• NMN improved muscle insulin sensitivity in a small trial of women with prediabetes [5].
• A 2026 systematic review found NR and NMN reliably raise NAD+-related markers in the blood [9].

Mixed results:

• In a 12-week trial in men with obesity, NR did not improve insulin sensitivity or body composition [6].
• Effects on physical function, metabolism and blood vessels vary between studies [9]. Researchers are still working out which people, doses and outcomes benefit most [10].

How is an NAD+ IV drip different?

An NAD+ drip delivers NAD+ itself, not its ingredients, straight into the bloodstream.

Why this might matter, in theory:

• It bypasses the gut and liver. Swallowed NR and NMN are largely broken down in the gut and liver, often into nicotinamide, before reaching other tissues [14]. An infusion skips this step.
• It raises blood NAD+ directly. In a pilot study, 11 healthy men received 750 mg of NAD+ over six hours. Blood NAD+ was unchanged for two hours, then rose markedly, and NAD+ and its breakdown products increased in urine [7]. This suggests the body actively takes up and processes infused NAD+.
• It may feed recycling pathways. NAD+ is too large to enter cells easily. Surface enzymes such as CD73 and CD38 break it into smaller pieces, including NMN and NR, which cells absorb and rebuild into NAD+ [1, 15]. An infusion may therefore act as a large, fast supply of these building blocks.
• It may support energy and repair. NAD+ fuels mitochondrial energy production and the sirtuins and PARPs involved in DNA repair [1]. Raising it could, in theory, support these processes where levels have fallen with age.

What we know so far:

Research is at an early stage. A 2026 systematic review found no completed trials of IV NAD+ for anti-ageing or wellness outcomes [9], so long-term effects on energy and ageing have not been measured. A 2026 study of 14 people in a wellness setting looked at tolerability [8] (see below).

NAD+ drip side effects and risks

1. Side effects during infusion

In the 2026 real-world study, people commonly reported nausea or stomach discomfort, a faster heart rate and chest pressure during the drip, especially at faster rates. Symptoms settled once the infusion ended [8]. Any IV procedure also carries risks such as bruising, vein irritation, infection and, rarely, allergic reactions.

2. Possible cardiovascular concerns

A 2024 Nature Medicine study linked high blood levels of 4PY, a breakdown product of excess niacin, to vascular inflammation and major cardiovascular events [11]. Other researchers have questioned how this applies to vitamin B3 use [12]. Whether repeated high-dose NAD+ boosting has similar effects is unknown.

3. Research still in progress

• Most trials are small and short.
• Few measure hard outcomes such as disease, disability or lifespan.
• Little is known about how NAD+ behaves in specific human tissues [10].
• There is no agreed dose, infusion rate or "optimal" NAD+ level.

4. Time commitment

Drips can take several hours, especially at slower rates, which are linked to fewer side effects [7, 8].

Why are people looking for NAD+ drips?

Most people searching for an NAD+ drip in Singapore want to fix a problem, such as:

• constant tiredness or low energy
• brain fog or poor concentration
• slow recovery from exercise or illness
• concerns about ageing and long-term health

These symptoms have many possible causes, and many are treatable. A 2023 clinical review lists common causes of fatigue in adults [13]:

• anaemia, iron deficiency and low vitamin B12
• an underactive thyroid (hypothyroidism)
• diabetes and kidney disease
• sleep disorders such as sleep apnoea
• depression and anxiety
• heart and lung conditions, and some infections

Before starting NAD+ drips: find the root cause

Before starting NAD+ drips, it is wiser to find out what is causing your symptoms. A drip will not explain why you feel tired or run down, and an underlying cause may need a different treatment [13].

1. Get a blood panel

Blood tests give a clear starting point and can reveal easily treatable problems. A doctor can advise which tests suit your symptoms and history [13].

2. "Normal" does not always mean optimal

Blood tests sometimes come back normal even when you feel unwell. "Normal" means your value falls within a reference range, usually based on the middle 95% of results from a reference group [16]. It shows you are typical, not necessarily at the best level for your health.

Metabolic problems can also develop quietly. A large UK study followed people before they were diagnosed with type 2 diabetes. Their insulin sensitivity began falling several years before diagnosis, while blood sugar rose sharply only in the final few years [17]. Early metabolic changes may therefore be under way while routine results still look normal, and some people have symptoms such as tiredness despite these results.

3. Consult a longevity doctor

A longevity expert or longevity doctor looks beyond whether results are "in range" and watches for early signs of metabolic issues before they become bigger problems. They also consider your sleep, stress, exercise, diet and family history, then explain which options suit your goals, including whether NAD+-based approaches have a place.

Questions to ask before any IV treatment

Before any IV wellness treatment, ask:

• Will a registered doctor assess me and review my medical history first?
• Is the treatment given at a licensed healthcare facility?
• What evidence supports it for my concern?
• What are the side effects, and what happens if I react badly?
• How does it interact with my medications or conditions?

Frequently asked questions

How does an NAD+ IV drip work?

It delivers NAD+ directly into the bloodstream, bypassing the gut and liver. It raises blood NAD+ [7], and the body can break it into building blocks that cells absorb and use [1, 15]. Trials on long-term effects on energy and ageing have not yet been completed [9].

What are the side effects of an NAD+ drip?

Reported side effects include nausea, stomach discomfort, a faster heart rate and chest pressure, especially at faster rates. These usually settle once the drip stops [8]. IV procedures also carry risks such as bruising, vein irritation and infection.

Is an NAD+ IV drip better than oral NAD+ supplements?

They work differently. A drip gives NAD+ itself and avoids gut and liver breakdown [14]; oral NR and NMN supply the ingredients to make it. Both raise blood NAD+ markers [7, 9], but no study has compared their health outcomes directly.

Should I start an NAD+ drip for low energy or ageing?

Find the root cause first. Blood tests are a good start [13]. Even with normal results, a longevity doctor can look for early signs of metabolic issues [17] and help you choose suitable options.

How long does an NAD+ IV drip take?

It varies. In one study, 500 mg infusions averaged about 1.5 hours, with patients adjusting the flow rate [8]. In another, 750 mg was infused over 6 hours [7]. Faster rates are linked to more side effects [8].

The bottom line

• NAD+ is vital for energy and cell repair, and its levels may fall with age.
• NR and NMN supplements supply the ingredients to make NAD+ and are popular with many users.
• NAD+ drips deliver NAD+ directly, bypassing the gut and liver. The theory is promising, but long-term trials are still to come.
• Side effects during infusion are common, especially at faster rates, and long-term safety is still being studied.

If tiredness, low energy or ageing is your concern, find the root cause first, through a blood panel and a longevity doctor consultation, before starting NAD+ drips.