NAD is important in cellular energy and aging. This blog will talk about an important dietary supplement: nad supplement and its benefits, and its functions in aging.
What is NAD+?
NAD+, short for nicotinamide adenine dinucleotide, is a key coenzyme in cell mitochondria. It participates in more than 500 enzymatic reactions and more than 2,000 biochemical reactions in the human body, driving the generation of more than 95% of the energy (ATP) for life activities. At the same time, it is an essential raw material for the synthesis of DNA repair enzymes and a core molecule for activating the seven major longevity enzyme families. Because it widely regulates cellular energy metabolism and damage repair, its name is “coenzyme I” and is the “energy source” and “repair foundation” for maintaining life activities.
How important is NAD+ to the human body?
The human body is composed of approximately 37 trillion cells, and the normal functioning of each cell depends on a key molecule—NAD+. It is a core participant in cellular energy metabolism, acting like a “conveyor belt” in a factory, continuously delivering energy to the cell and maintaining basic life activities.
Without NAD+, the heart cannot beat, the lungs cannot breathe, and neurons in the brain cannot transmit signals—the functions of all vital organs will cease. It not only supports the cell’s energy metabolism system, preventing cell collapse due to energy depletion, but is also a crucial “building block” for repairing DNA damage. Once NAD+ is insufficient, DNA repair mechanisms fail, accelerating cell aging and death.
Why can NAD+ make people look younger ?
NAD+ promotes metabolic homeostasis
It plays a particularly active role in metabolic processes such as glycolysis, the TCA cycle (also known as the Krebs cycle or citric acid cycle), and the electron transport chain, serving as a means for cells to obtain energy. Aging and high-calorie diets decrease NAD+ levels in the body.
Studies have shown that in aged mice, administration of NAD+ supplements can reduce diet- or age-related weight gain and improve their motor function. Furthermore, other studies have even reversed the effects of diabetes in female mice, demonstrating a novel strategy for combating metabolic diseases such as obesity.
NAD+ binds to enzymes and transfers electrons between molecules. Electrons are the foundation of cellular energy. NAD+ acts on cells much like a battery charges. When electrons are depleted, the battery is exhausted. In cells, NAD+ promotes electron transport, providing energy for the cell. Thus, NAD+ can decrease or increase enzyme activity, promote gene expression, and facilitate cell signaling.
NAD+ helps control DNA damage
As organisms age, adverse environmental factors such as radiation, pollution, and inaccurate DNA replication can damage DNA, which is one theory of aging. Almost all cells contain “molecular mechanisms” for repairing this damage.
This repair process requires NAD+ and energy; therefore, excessive DNA damage depletes precious cellular resources. The function of PARP, an important DNA repair protein, also depends on NAD+. Normal aging leads to the accumulation of DNA damage in the body, increasing PARP levels and thus decreasing NAD+ concentration. Any step of DNA damage in the mitochondria exacerbates this depletion.
NAD+ affects the activity of longevity genes Sirtuins, inhibiting aging.
The newly discovered longevity genes, sirtuins, also known as “guardians of genes,” play a crucial role in maintaining cellular health. Sirtuins are a family of enzymes involved in cellular stress responses and damage repair. They are also involved in insulin secretion, the aging process, and age-related health conditions such as neurodegenerative diseases and diabetes.
NAD+ is the fuel that helps sirtuins maintain genome integrity and promote DNA repair. Just as a car cannot function without fuel, sirtuins require NAD+ for activation. Animal studies have shown that increasing NAD+ levels in the body can activate silencing regulatory proteins and extend the lifespan of yeast and mice.
Cardiac function
Increasing NAD+ levels can protect the heart and improve cardiac function. High blood pressure can cause cardiac enlargement and arterial blockage, leading to stroke. Supplementing the heart with NAD+ supplements inhibits reperfusion-induced damage to the heart. Other studies have shown that NAD+ supplements can also protect mice from abnormal cardiac enlargement.
Neurodegeneration
In mice with Alzheimer’s disease, elevated NAD+ levels reduced the accumulation of proteins that disrupt brain communication, thereby enhancing cognitive function. Elevated NAD+ levels also protected brain cells from death when there was insufficient blood flow to the brain. This demonstrates new promise for NAD+ in protecting against neurodegeneration and improving memory.
Immune system
As we age, our immune system declines, making us more susceptible to illness. Recent research has shown that NAD+ levels play a crucial role in regulating immune responses and inflammation and cell survival during the aging process. This study highlights the therapeutic potential of NAD+ for immune dysfunction.
The Relationship Between NAD+ and Aging
Coenzymes participate in the metabolism of essential substances such as carbohydrates, fats, and proteins in the human body, playing a crucial role in regulating energy metabolism and maintaining normal physiological functions. NAD is one of the most important coenzymes in the human body, also known as coenzyme I, participating in thousands of redox enzyme reactions. It is an indispensable substance for the metabolism of every cell. It has many functions, the main ones being:
Promote the production of bioenergy
NAD+ generates ATP through cellular respiration, which directly replenishes cellular energy and enhances cellular function;
Repairing genes
NAD+ is the only substrate of the DNA repair enzyme PARP. This type of enzyme participates in DNA repair, helps repair damaged DNA and cells, reduces the chance of cell mutation, and prevents the occurrence of cancer.
Activate all longevity proteins
NAD+ can activate all seven longevity proteins, therefore NAD+ has a more important impact on anti-aging and life extension.
Enhance the immune system
NAD+ strengthens the immune system and enhances cellular immunity by selectively influencing the survival and function of regulatory T cells.
It is noteworthy that in various model organisms, including rodents and humans, aging is accompanied by a gradual decline in NAD+ levels in tissues and cells. This decline in NAD+ levels is causally linked to many age-related diseases, including cognitive decline, cancer, metabolic diseases, sarcopenia, and frailty.
Conclusion
NMN, as a precursor to NAD+ synthesis, slows down the depletion of NAD+ with age by increasing NAD+ levels in the body, and therefore can be used as an anti-aging health supplement.
