Nucleotides. The forgotten building block of cellular regeneration.

A Beijing study completed in 2025 reduced the DNA methylation age of older adults by three years using an unspectacular supplement. That supplement was not NMN, not rapamycin, and not spermidine. It was nucleotides — a class of compounds found in every mother's milk, every ATP molecule, and every DNA helix, yet rarely included in any longevity protocol.

While the longevity community debates NAD+ and NMN, it systematically overlooks the more understated relatives from which NAD+ is actually built. And it is precisely here that the more compelling body of evidence is growing. Time for a clear-eyed assessment of one of the most thoroughly researched and most consistently overlooked compound classes in nutritional science.

What nucleotides are

Nucleotides are the molecular building blocks of DNA and RNA. Each nucleotide consists of three components: a nitrogenous base, a sugar, and one to three phosphate groups. The five relevant bases divide into two families. Adenine and guanine belong to the purines. Cytosine, thymine, and uracil belong to the pyrimidines.

Beyond their role in DNA and RNA, nucleotides are involved in central cellular processes. ATP is the energy currency of every cell. NAD and FAD function as coenzymes in energy metabolism. cAMP and cGMP carry signalling tasks between cells. Without nucleotides, not a single human cell functions.

Where nucleotides come from

The body draws on three sources for nucleotides. De novo synthesis builds them from amino acids and simple precursors. It is energetically demanding, but autonomous. The salvage pathway recycles nucleotide fragments efficiently. The third source is dietary intake via DNA and RNA in food.

In a healthy adult, synthesis and salvage cover baseline requirements. Under stress, during growth, infection, injury, or with advancing age, demand rises to a point where endogenous pathways can no longer meet it. This is precisely why nucleotides are described in the scientific literature as "conditionally essential".

What nucleotides do

The most robust evidence exists across four domains. The immune system shows increased NK cell activity, higher interleukin-2 production, and improved antibody responses to vaccines, particularly Hib and diphtheria. In the gut, nucleotides improve mucosal maturation and repair, support more favourable microbiome profiles, and reduce diarrhoea incidence in supplemented infants. The liver benefits from regeneration and activation support, as animal studies demonstrate. For energy and recovery, nucleotides stabilise the ATP pool, accelerate muscle recovery, and increase mental resilience under stress.

Life-phase logic: when nucleotides become decisive

Infants and toddlers (0 to 3 years)

Breast milk contains 69 to 72 mg of nucleotides per litre. A three-kilogram infant takes in approximately 120 mg per day. Infant formula has been enriched with nucleotides worldwide since the 1990s. Not without reason. Studies document stronger immune responses, higher NK cell cytotoxicity, better vaccine responses, healthier gut flora, and reduced diarrhoea. Catch-up growth has even been documented in intrauterine growth-restricted infants.

Children and teenagers

This phase is characterised by high rates of cell division in the immune system, skeleton, muscle, and nervous system. Endogenous synthesis is generally sufficient here. But during periods of intensive growth, infection, or high physical demand in competitive sport, requirements can exceed endogenous output. The evidence base is thinner here than for infants and older adults. An honest assessment.

Younger adults and athletes

Under normal conditions, younger adults are well supplied. Under intensive training, de novo synthesis partially collapses, ATP turnover rises, and salvage alone is insufficient. Sublingual nucleotide supplementation improved immune response to exercise and reduced URTI incidence in endurance athletes. Practical relevance is most apparent during competition phases, for overtraining protection, and for faster recovery.

Older adults (60 plus)

This is where things become relevant for longevity practice. The TALENTs Trial from Peking University examined 121 participants aged 60 to 70 over 19 weeks. Participants received either 1.2 g of nucleotides per day or placebo. The result: DNAmAge in the nucleotide group was 3.08 years lower than in the placebo group after 19 weeks. HOMA-IR improved significantly. No effect on telomere length was observed. An interesting parallel to the recent vitamin D findings.

A concurrently published paper from the Universidad de Valencia documented improvements in neurogenesis markers, cognitive capacity, muscle function, and body composition in 69 older adults. A further 2025 paper in the Journal of Cachexia, Sarcopenia and Muscle shows that exogenous nucleotides can attenuate age-related muscle loss.

Old and very old adults (75 plus)

The direct body of evidence is thinner here, but mechanistically highly plausible. Salvage and de novo pathways measurably decline with age. Their importance for immune competence, muscle maintenance, wound healing, and cognitive resilience increases. High degree of mechanistic plausibility. Lower study density than in the 60-to-70 age group.

Dietary sources: where nucleotides occur naturally

Yeast and yeast extracts such as Marmite, Vegemite, and brewer's yeast have very high nucleotide content. Organ meats, particularly liver and kidney, are traditionally rich sources. Sardines, anchovies, mackerel, and fish roe also deliver high amounts.

High content is found in mushrooms. They represent the highest nucleotide content of any plant-based source. Shellfish and seafood, lean meat, and legumes such as lentils, beans, and peas follow. Moderate content is present in whole grains and sprouts, as well as fermented products such as tempeh, miso, and kefir. Poultry also falls into this category.

Low content characterises most fruits, dairy products. The important exception here is breast milk. Processed foods also fall into this category. Heat and processing reduce nucleotide content significantly.

The modern Western diet contains substantially fewer nucleotides than traditional dietary patterns. Less organ meat, more convenience food, a lower proportion of fermented products. Here lies a subtle, frequently overlooked deficit.

Swiss path: Peter Köppel as a European voice

Dr. rer. nat. Peter Köppel, a Swiss biochemist with a doctorate in the field, has been researching nucleotides for over 30 years. His areas of specialisation include biochemistry, biotechnology, and immunology. Köppel is internationally published and closely associated with the brand Vegana Natura, which produces individually selected nucleotide preparations based on his research.

Köppel's focus is on individually selected nucleotides derived from yeast. His point: bioavailability and purity are decisive quality criteria in supplementation. The Swiss research landscape offers an interesting alternative to the dominant American and Asian approaches.

SLOW relevance: holistic and precise

Nucleotides are a textbook example of SLOW's core framing. Holistic and precise at the same time. They act across multiple systems: immune system, gut, liver, energy metabolism, and epigenetics. At the same time, their relevance varies by life phase. Infants need them for immune maturation and gut health. Athletes need them for recovery. Older adults need them for DNA methylation and sarcopenia prevention.

This life-phase-specific precision makes nucleotides an ideal marker for evidence-based health optimisation. From data to results. Measurable biomarker changes lead to documented outcomes. Where noise fails, trust wins. While the longevity scene debates spectacular individual compounds, the solid evidence base for the unspectacular nucleotides continues to grow.

Closing the gap

Nucleotides are not a new trend. They are a compound class with decades of solid documentation. They are needed in life-phase-specific ways under certain conditions and are significantly undervalued in the current longevity discussion. The modern diet systematically delivers too few of them. Research shows measurable effects on DNA methylation, immune function, muscle maintenance, and cognitive capacity.

For health professionals, nucleotides offer an evidence-based option beyond mainstream hype. Not spectacular, but effective. Not dramatic, but measurable. That is precisely what precise health optimisation looks like.

In which life phases do you see the greatest unmet need in your practice? We are collecting your observations and will address them in a follow-up post.

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