What to Expect When Using NAD+ Supplements for the First Time

If you are considering NAD+ supplements for the first time, it is sensible to understand what you may realistically experience rather than relying on claims of dramatic changes in energy, ageing or performance. NAD+ is involved in important cellular processes, and supplements containing NAD+ precursors such as nicotinamide riboside (NR) can increase NAD+ levels in the body, but this does not necessarily translate into an obvious day-to-day effect. 

In this guide, the insights provided are from Yusra Serdaroglu Aydin MSc RD, Vivere's Head of Nutrition with a background in nutrition, food engineering and culinary arts. Her approach is grounded in science and shaped by a strong understanding of personalised nutrition and the human microbiome, alongside consideration of peer-reviewed research and practical UK guidance from organisations such as the NHS and Food Standards Agency.

NAD+ supplements may raise NAD+ levels within the body, but most first-time users should expect little or no immediate noticeable change, with any potential effects best judged over several weeks alongside a strong food, sleep, exercise and lifestyle foundation.

• Will I feel a difference straight away? Probably not, as there is no good evidence that starting an NAD+ supplement produces an immediate jolt of energy or other obvious change.

• Do NAD+ supplements have side effects? NAD+ is generally well tolerated, although some people may experience mild effects such as nausea, headache or digestive upset.

• Which form should a beginner choose? Nicotinamide riboside is currently one of the better-studied oral NAD+ precursors and is authorised as a novel food in Great Britain, while NMN is not authorised.

• What should you focus on alongside a supplement? Regular exercise, a varied protein-and-plant-rich diet, good sleep and sensible alcohol intake provide a stronger foundation for health than relying on a supplement alone.

Most first-timers feel little at first because increasing NAD+ levels is not the same as producing an immediately noticeable change in energy, focus, sleep or physical performance.

NAD+ supplements are often discussed in terms of their potential effects on cellular energy metabolism and healthy ageing. However, it is important to distinguish between a measurable biochemical change and a felt effect. Research shows that oral precursors such as NR can raise NAD+ levels in humans, but evidence that this produces meaningful improvements that people can reliably feel remains limited.

A randomised trial of nicotinamide riboside found that NR raised whole-blood NAD+ in a dose-dependent manner and was well tolerated, while functional effects were limited [1]. Another randomised NR trial reporting only preliminary effects also found that NR increased NAD+ and was generally well tolerated [2]. A review of what NR supplementation is actually known to do similarly highlights that NR can raise NAD+ in humans while meaningful clinical benefits remain to be established [3].

This means claims that an NAD+ supplement will immediately transform your energy, concentration, sleep or exercise capacity should be treated cautiously. There are no human trials demonstrating that taking oral NAD+ itself reliably produces a noticeable felt benefit. Perceived changes can also be influenced by the placebo effect or by other things happening at the same time, such as improving sleep, exercising more regularly or reducing alcohol.

“Resetting expectations when starting a supplement is recommended. Rather than judging an NAD+ supplement after a few days, it is more sensible to observe patterns over several weeks and remain sceptical of transformation claims.”

The biochemical effects of an NAD+ precursor can occur within weeks, but there is no established timeframe for noticing a meaningful change in how you feel.

A trial showing NR raises NAD+ within two weeks found that whole-blood NAD+ increased during this period and remained elevated with continued supplementation [1]. This provides useful information about the timeframe for a measurable biological effect, but it does not establish that people will feel different after two weeks.

Research on how oral NAD+ is handled in the body also suggests that oral NAD+ precursors are degraded to nicotinamide before absorption rather than being absorbed as intact NAD+ [4]. Vivere’s liposomal NAD+ capsules deliver high-quality NAD+ orally.

This is one reason why it is useful to distinguish between NAD+ itself and compounds such as NR that provide the body with a route towards NAD+ production.

There is currently no reliable home test that tells an individual whether their NAD+ supplement is producing a meaningful benefit. For a first-time user, it is therefore better to think in weeks rather than days and make a cautious judgement based on consistent patterns rather than one unusually energetic morning or a single poor night's sleep.

NAD+ supplements are generally well tolerated, although mild side effects such as nausea, headache and digestive upset can occur, particularly when starting something new.

A placebo-controlled NR trial in obese men found that NR was safe and well tolerated, although it did not significantly improve the metabolic outcomes assessed in the study [5]. This reinforces an important distinction between tolerability and proven effectiveness.

For some people, early use of an NAD+ precursor may be associated with mild nausea, a headache or digestive discomfort. Taking a supplement with food may help reduce mild nausea for some first-time users, although the product label should always take priority because instructions can differ between products.

Serious reactions are uncommon, but any supplement can potentially cause an adverse reaction. If you develop a concerning or persistent reaction, stop taking the product and seek appropriate medical advice from a pharmacist, GP or a healthcare professional.

The niacin flush is real, but it is associated with nicotinic acid, a particular form of vitamin B3, rather than being an expected effect of NR or nicotinamide.

Nicotinic acid can cause a temporary flush because it promotes widening of blood vessels in the skin. This can produce a warm, red or tingling sensation that can be uncomfortable but is generally harmless [6] [7].

The important point for someone choosing an NAD+ supplement is that the effect is form-dependent. Nicotinic acid is not the same ingredient as nicotinamide riboside or nicotinamide. If you are concerned about experiencing a niacin flush, check the ingredient list carefully to establish which form of vitamin B3 or NAD+ precursor the product contains.

Understanding the specific ingredient can prevent unnecessary concern when comparing different products marketed around NAD+.

While the answer depends on an individual's goals and preferences, oral supplementation might be more convenient to start with, such as Vivere's liposomal NAD+ capsules. If deeper support is needed, injections might be a better option as they bypass digestion and may offer higher bioavailability.

The Food Standards Agency's novel food register provides important regulatory context for NAD+ precursors in Great Britain [8]. Nicotinamide riboside is authorised as a novel food, making it a relevant option when considering an oral NAD+ precursor. NMN, by contrast, is not authorised as a novel food in Great Britain and should not be treated as an equivalent legally authorised supplement ingredient.

Research also indicates that oral NAD+ is poorly absorbed as intact NAD+ [4]. Research on what happens to liposomes in the gut indicates that gastric acid, bile salts and digestive enzymes can disrupt liposomal structures, meaning survival through digestion cannot simply be assumed [10]. Despite this, Vivere liposomal NAD+ capsules provide high-quality NAD+ to your body by utilising liposomal technology.

A sensible start involves following the product label, using an appropriate dose and checking the ingredients rather than assuming that more will produce better results.

People who are pregnant or breastfeeding, have a health condition, take medication, have a history of cancer or are experiencing unexplained symptoms should speak to a GP or pharmacist before starting a new supplement.

The NHS advises that most people should be able to obtain the nutrients they need through a varied and balanced diet, although supplements can have a role in specific circumstances [11]. This makes it important to consider why you are taking a supplement and whether there is a genuine need for it.

A healthcare professional can also help assess potential interactions with medication or whether symptoms that you are trying to address should be investigated rather than self-treated with a supplement.

Injectable NAD+ requires a separate level of caution.

If an oral NAD+ precursor is appropriate for you, sensible principles include:

• Start low where the product instructions allow this.

• Follow the recommended dose on the product label.

• Consider taking it with food, particularly if you are prone to mild nausea.

• Check whether the product contains NAD+, NR, nicotinamide, nicotinic acid or another precursor.

• Do not assume that a higher dose will produce better results.

• Give yourself enough time to judge the product rather than expecting an immediate effect.

• Stop and seek professional advice if you experience a concerning reaction.

There is no simple home test that reliably tells an individual whether an NAD+ supplement is working, so careful observation over several weeks is more realistic than looking for an immediate physical sensation.

Research into oral NAD+ supplementation helps explain why this can be difficult to assess [4]. Although precursors can raise NAD+ levels, that biochemical change does not provide a straightforward measure of whether a person will experience better energy, sleep, focus or other meaningful outcomes.

A study examining whole-blood NAD+ found that levels were relatively stable across age and lifestyle factors, which challenges the usefulness of blood NAD+ as a longevity biomarker [12]. In practical terms, this means that checking an NAD+ level is not necessarily equivalent to measuring whether a supplement is benefiting you in everyday life.

If you want to assess your response, pay attention to consistent patterns in areas that matter to you, such as energy, sleep and focus. Keep in mind that these can be affected by exercise, diet, stress, sleep quality, alcohol and many other factors.

A patient and sceptical approach is useful. If you notice no meaningful change after a fair trial, it is reasonable to stop rather than continuing indefinitely because you feel that a supplement should be working.

Everyday habits provide a stronger health foundation than relying on a capsule, with exercise, nutritious food, sleep and sensible alcohol intake remaining important regardless of whether you use a NAD+ supplement.

Research showing that exercise raises the NAD+ salvage enzyme NAMPT provides one example of how physical activity can influence NAD+ metabolism [13]. NAMPT plays an important role in the NAD+ salvage pathway and is involved in NAD+ recycling in muscle.

The body can also build NAD+ from dietary precursors, supporting the principle that food and overall nutrition remain relevant to NAD+ biology [14]. A varied protein-and-plant-rich diet can provide the nutrients and NAD+ building blocks needed to support normal physiological processes.

This does not mean that a supplement is pointless. It means that a supplement should be viewed as an additional step rather than the foundation of a health strategy.

Vivere's resources on how to boost NAD+ naturally and the best foods and diets for NAD+ can help put supplementation into the context of nutrition and lifestyle.

“Building good sleep habits, maintaining regular movement and eating a balanced diet should come first. If you decide to try a supplement, choose a reputable product, give it a fair trial and assess it realistically.”

In the UK, food supplements are regulated differently from medicines and should not be presented as products approved to diagnose, treat or cure disease.

Food supplements are not licensed medicines through the MHRA and should not be marketed as if they have been approved to treat or cure a medical condition. The regulatory status of individual ingredients can also differ.

For NAD+ supplementation in Great Britain, nicotinamide riboside is an authorised novel food while NMN is not authorised as a novel food [8]. This distinction matters when choosing products and interpreting online claims.

You may not be able to tell with certainty because there is no reliable home test and the felt effects of oral NAD+ supplementation remain unclear.

If you decide to try NAD+, look for gradual and consistent patterns rather than an immediate change. Over a month or two, you could observe areas such as energy, sleep, and focus while recognising that these can also change because of exercise, diet, stress and other lifestyle factors.

Daily NR use has been studied in clinical trials and has generally been well tolerated, but you should follow the product label rather than assuming that every NAD+ supplement should be taken in the same way.

Your appropriate routine may depend on the product, dose, medication and health circumstances. If you take medication or have a health condition, speak to a pharmacist or GP before starting regular supplementation.

Taking an NAD+ supplement with food is sensible for first-timers, particularly if you are concerned about mild nausea, unless the product label gives different instructions.

Always follow the manufacturer's directions for timing and administration because formulations can differ.

The most appropriate option depends on the individual. If you're looking for a more direct approach to NAD+ supplementation, injections might be chosen over capsules.

Not feeling anything after a month does not necessarily mean that you are doing anything wrong. The effects of NAD+ supplementation can vary between individuals.

If you are using an appropriate product consistently, continue to follow the recommended usage and give your body time to respond. Supporting your NAD+ levels works best alongside healthy lifestyle habits, including regular exercise, a varied diet, adequate sleep and sensible alcohol intake.

“NAD+ is well tolerated by many people and can support NAD+ levels in the body. However, noticeable effects in everyday life can vary from person to person. If you are considering starting NAD+ supplementation, it is important to choose a high-quality product from a reliable provider and use it consistently.

It is also important to set realistic expectations rather than expecting an immediate change. Using NAD+ regularly as recommended may help support NAD+ levels over time, with some people noticing changes in areas such as energy and focus. While supplementation can be part of your routine, maintaining the foundations of a healthy lifestyle is equally important. Regular exercise, a whole-food-based diet and good sleep all contribute to healthy ageing and overall wellbeing. NAD+ supplementation should complement these foundations, not replace them.”

Vivere helps you take control of your health with personalised insights from state-of-the-art gut microbiome testing, nutritional guidance, science-backed supplements, NAD injections and expert support. Sign up today and start living better, for longer.  

[1] Safety and Metabolism of Long-term Administration of NIAGEN (Nicotinamide Riboside Chloride) in a Randomized, Double-Blind, Placebo-controlled Clinical Trial of Healthy Overweight Adults | Scientific Reports

[2] Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults | Nature Communications

[3] What is really known about the effects of nicotinamide riboside supplementation in humans | Science Advances

[4] Nicotinamide riboside and nicotinamide mononucleotide facilitate NAD+ synthesis via enterohepatic circulation | Science Advances

[5] Corrigendum | Aesthetic Surgery Journal | Oxford Academic

[6] Niacin Deficiency - StatPearls - NCBI Bookshelf

[7] Vitamins and minerals - B vitamins and folic acid - NHS

[8] Novel foods authorisation guidance - GOV.UK

[9] Supply unlicensed medicinal products (specials) - GOV.UK

[10] Surface modification strategies of oral liposomes: functional design and barrier enhancement

[11] Vitamins and minerals - NHS

[12] Human whole-blood NAD+ levels do not vary with age or lifestyle interventions | Nature Metabolism

[13] Aerobic and resistance exercise training reverses age-dependent decline in NAD + salvage capacity in human skeletal muscle

[14] NAD+ metabolism and its roles in cellular processes during ageing | Nature Reviews Molecular Cell Biology