NAD and Anti-Ageing: What the Science Actually Says
Interest in NAD has exploded in the aesthetics and longevity space over the last few years. From celebrity IV drips to oral supplements marketed for “cellular rejuvenation,” patients are increasingly asking whether NAD can genuinely slow ageing, improve skin quality, increase energy, or support healthy longevity.
The reality is more nuanced.
There is legitimate scientific interest in NAD and ageing biology, but there is also substantial marketing hype. For aesthetic practitioners, the key is understanding where the evidence is strongest, where it remains preliminary, and how NAD compares with more established interventions such as collagen supplementation and peptide therapies.
For patients seeking evidence-based anti-ageing support, NAD may have a role – particularly in cellular energy metabolism and healthy ageing pathways – but it is not a miracle cure. Please note that there are some affiliate links in this blog post but the post is not sponsored.
If you are already exploring regenerative and non-surgical rejuvenation treatments, you may also be interested in advanced facial rejuvenation options available at Dr Kara’s Norwich aesthetic clinic.
What Is NAD?
NAD stands for nicotinamide adenine dinucleotide – a coenzyme present in every living cell.
Its primary role is supporting:
Cellular energy production
Mitochondrial function
DNA repair
Oxidative stress regulation
Sirtuin activation (longevity-associated proteins)
Cellular metabolism
NAD levels naturally decline with age. Researchers believe this decline may contribute to several recognised hallmarks of ageing, including mitochondrial dysfunction, chronic inflammation, impaired DNA repair, and reduced cellular resilience. (Nature)
This is why NAD has become central to modern longevity research.
How NAD Works in the Body
To understand why NAD matters, it helps to think of it as a cellular “fuel transfer” molecule.
NAD helps mitochondria convert nutrients into ATP – the energy currency cells use to function. Without adequate NAD, cells become less efficient at producing energy and repairing damage.
NAD is also required for enzymes called sirtuins and PARPs:
Sirtuins help regulate inflammation, mitochondrial health, and cellular ageing
PARPs assist with DNA repair following oxidative or environmental damage
As we age, NAD stores appear to decline while cellular demand increases. This creates a biological environment associated with fatigue, slower recovery, inflammation, and age-related cellular dysfunction. (Nature)
This mechanism is biologically plausible – and is one reason the NAD field has gained serious academic attention.
Why NAD Is Linked to Anti-Ageing
Most anti-ageing interest focuses on the idea that restoring NAD levels may improve cellular resilience and metabolic function.
Potential benefits being investigated include:
Improved mitochondrial efficiency
Enhanced DNA repair
Reduced oxidative stress
Better metabolic health
Improved cognitive performance
Increased physical energy
Healthier skin ageing pathways
Animal studies have shown particularly promising results. In rodents, NAD precursor supplementation has demonstrated improvements in metabolic function, inflammation, muscle performance, vascular health, and some age-related disease markers. (ScienceDirect)
However, translating these findings into humans remains the challenge.
Has NAD Actually Been Proven to Work?
This is where many online claims become exaggerated.
What has been proven
Human studies consistently show that NAD precursors such as:
Nicotinamide riboside (NR)
Nicotinamide mononucleotide (NMN)
can successfully raise NAD-related biomarkers in the body. (ScienceDirect)
There is also early evidence suggesting possible benefits for:
Energy metabolism
Exercise recovery
Vascular function
Insulin sensitivity
Fatigue
Cognitive support
What has not been proven
There is currently no high-quality evidence proving that NAD supplementation reverses ageing in humans.
Most clinical trials remain:
Small
Short-term
Heterogeneous
Focused on biomarkers rather than visible ageing outcomes
A 2025 review in Nature Metabolism concluded that while preclinical evidence is compelling, human efficacy data remains limited and inconsistent. (Nature)
Similarly, a large systematic review published in Ageing Research Reviews found that oral NR and NMN reliably increase NAD levels, but evidence for meaningful anti-ageing outcomes in humans is still mixed. (ScienceDirect)
So the evidence-based position is:
NAD biology is scientifically credible, but the anti-ageing claims currently exceed the clinical evidence.
NAD Supplements vs NAD IV Therapy
Patients are often confused about the difference between oral NAD supplements and IV NAD drips.
Oral NAD precursors
Most supplements do not contain active NAD itself because NAD is poorly absorbed orally.
Instead, they contain precursors such as:
NR (nicotinamide riboside)
NMN (nicotinamide mononucleotide)
These compounds are converted into NAD within cells.
Current research suggests oral precursors are likely the most evidence-supported approach for increasing intracellular NAD levels. (ScienceDirect)
IV NAD therapy
IV NAD infusions have become popular in wellness clinics and celebrity longevity culture.
Claims often include:
Improved mental clarity
Increased energy
Reduced brain fog
Enhanced recovery
However, clinical evidence supporting IV NAD for anti-ageing remains extremely limited. Some experts have questioned whether IV NAD offers meaningful advantages over oral precursors. (WIRED)
Is NAD Safe?
Current evidence suggests NAD precursor supplements are generally well tolerated in healthy adults at standard doses. (Forbes)
Reported side effects are usually mild and may include:
Nausea
Bloating
Headaches
Digestive upset
Flushing (more common with niacin forms)
Sleep disturbance if taken late in the day
IV NAD therapy may additionally cause:
Chest tightness
Cramping
Anxiety sensations
Infusion discomfort
Nausea during rapid administration
Important safety considerations
Patients should exercise caution if they have:
Active cancer
Significant liver disease
Pregnancy or breastfeeding
Complex metabolic disorders
Long-term human safety data is still limited. Most studies only assess supplementation over months rather than years. (NMN Labo)
As with all supplements, quality control matters significantly. Third-party tested products are preferable due to variability in supplement manufacturing standards. (Forbes)
NAD Supplement recommendations
NAD vs Peptides vs Collagen Supplements
Patients often ask which anti-ageing supplement category is “best.”
The answer depends on the treatment goal.
NAD Supplements
Best for:
Cellular energy support
Longevity pathways
Fatigue
Mitochondrial support
Healthy ageing optimisation
Evidence strength:
Moderate mechanistic evidence; limited long-term human anti-ageing outcome data.
Main limitation:
Human evidence is still emerging.
Peptide Therapies
Peptides are short amino acid chains that act as signalling molecules.
Examples used in aesthetic and regenerative medicine include:
GHK-Cu
BPC-157
CJC-1295
Epitalon
Depending on the peptide, they may target:
Tissue repair
Collagen stimulation
Recovery
Growth hormone pathways
Skin rejuvenation
Best for:
Regenerative medicine
Tissue healing
Skin quality
Recovery optimisation
Evidence strength:
Highly variable depending on the peptide. Some have promising early data, but many remain experimental or lack large-scale human trials.
Main limitation:
Regulation and quality control can be inconsistent.
Collagen Supplements
Collagen supplementation is far more established in aesthetic medicine.
Hydrolysed collagen peptides have demonstrated benefits in several human studies for:
Skin hydration
Skin elasticity
Fine lines
Nail quality
Joint support
Best for:
Skin texture
Hydration
Structural skin support
Evidence strength:
Moderate-to-good human evidence for skin quality improvement.
Main limitation:
Effects are typically subtle and gradual rather than transformative.
Which Option Makes the Most Sense?
For most aesthetic patients:
Collagen has the strongest evidence for visible skin-related outcomes
NAD is more focused on cellular health and systemic ageing pathways
Peptides may offer targeted regenerative benefits but vary substantially in evidence quality
In practice, these approaches are not necessarily competing therapies. They may complement each other when used appropriately within a broader healthy ageing strategy.
Who May Benefit Most From NAD Support?
Patients who may potentially benefit include those experiencing:
Fatigue
High stress
Poor recovery
Age-related energy decline
Intensive training schedules
Early signs of metabolic dysfunction
However, NAD should not replace:
Sleep optimisation
Exercise
Protein intake
Sun protection
Evidence-based aesthetic treatments
Good nutrition
Lifestyle interventions remain more evidence-supported for healthy ageing than any single supplement currently available. (Medical News Today)
Final Thoughts
NAD is one of the most scientifically interesting areas in longevity medicine right now.
The biology is compelling:
NAD plays a critical role in mitochondrial function, DNA repair, inflammation regulation, and cellular ageing pathways.
However, there is an important distinction between:
“biologically plausible”
and“clinically proven.”
Current evidence suggests NAD precursors can successfully raise NAD levels and may support aspects of healthy ageing, energy metabolism, and cellular resilience. But claims of dramatic age reversal are not currently supported by robust human evidence.
For aesthetic patients, NAD may best be viewed as:
a supportive longevity tool,
not a standalone anti-ageing solution.
When combined with evidence-based aesthetic treatments, skin health optimisation, exercise, sleep, nutrition, and medical guidance, NAD supplementation may have a meaningful role in modern healthy ageing strategies.
For patients interested in holistic facial rejuvenation and non-surgical anti-ageing treatments in Norwich, visit Dr Kara Aesthetics Norwich.