NAD, also known as nicotinamide adenine dinucleotide, is an essential bioactive molecule in our body. Its main functions include: 1. NAD has significant anti-aging effects. As we age, the level of NAD in the human body gradually decreases, leading to accelerated cellular aging. Supplementing with NAD can effectively activate anti-aging mechanisms, delay cellular aging, and keep our bodies young. 2. NAD is crucial for enhancing energy. It participates in the energy production process of cellular mitochondria, helping us maintain abundant physical energy. When NAD levels are sufficient, we feel energized and able to cope with various challenges in daily life. 3. NAD can also promote cell repair. In daily life, our bodies are inevitably damaged, and NAD can help repair damaged cells and tissues, promoting physical recovery. 4. NAD can also improve cognitive function. By activating relevant proteins in brain cells, NAD can enhance memory, thinking ability, and concentration, making our brain more flexible and sharp.