NAD+ effects? Why longevity starts with cellular energy

NAD+ is a helper in almost every cell. It helps turn food into energy, and enzymes need it for DNA repair (Covarrubias, 2021). Animal studies show a significant decline in levels with age. The picture is less clear in humans. A 2025 review found a decline in only a few studies. Studies of precursors have also shown only limited effects in humans so far (Vinten, 2025). So the role of NAD+ in the cell is well understood. Researchers are currently investigating intensively how much taking additional NAD+ can benefit healthy people. That’s exactly what makes this molecule one of the most exciting topics in longevity.

Energy for every cell

Every cell needs energy. NAD+ acts as a coenzyme, or helper, in the respiratory chain. This is how ATP, the fuel for your cells, is produced (Verbraucherzentrale, 2026). Without this helper, the process cannot run. That’s why you often hear it called the body’s energy molecule.

Sirtuins and DNA repair

The molecule is also a building block for enzymes that do not provide energy. These include sirtuins, which are involved in regulating genes and metabolism. PARP enzymes also help repair genetic information (Covarrubias, 2021). Both consume NAD+. Another enzyme, called CD38, breaks it down. The more repair a cell has to carry out, the more NAD+ it loses.

Does NAD+ decline with age?

In mice and rats, levels decline with age in many tissues (Covarrubias, 2021). The picture in humans is mixed. In muscle, a key enzyme involved in its production declines with age (de Guia, 2019). By contrast, a study of seven groups found no difference in blood levels between young and old people (Tretowicz, 2026). For you, this means NAD+ is important for healthy aging. But a blood test for it says little about your biological age.

With an NAD+ infusion, the molecule flows directly into a vein through a cannula. Clinics usually offer it as a series of several appointments. A Berlin clinic charges 450 euros per session and recommends six to ten infusions (Praxis Dr. Mertz, 2026). That quickly adds up to four figures. A session usually lasts one to three hours.

What happens in the blood afterward has not been studied much. In a small study using a six-hour infusion, plasma levels did not rise during the first two hours. The body broke down the molecule immediately (Grant, 2019). A 2026 review of real-world clinical practice compared NAD+ infusions with the precursor NR. All six people in the NAD+ group experienced symptoms such as abdominal cramps, nausea or chest pressure during the infusion. These went away after the infusion ended (Reyna, 2026). The study was small and had no control group.

The case for the infusion is that the molecule bypasses digestion and a reputable clinic checks beforehand with a doctor whether the treatment is right for you. The downsides are the high cost, the time commitment and the frequent side effects. There are still no controlled studies on skin or healthy years of life. An NAD+ infusion is a medical treatment. If you’re considering one, talk to your doctor first. This is especially important if you have cardiovascular disease, are pregnant or take medication.

One particularly well-studied precursor for the skin is niacinamide, or vitamin B3. In a study of 50 women aged 40 to 60, after twelve weeks of using five percent niacinamide, fine lines, spots, and dull skin tone improved compared with the cream without the active ingredient (Bissett, 2004). The study was funded by a cosmetics manufacturer. The cream was well tolerated, but changes only appeared after several weeks.

NAD+ applied directly to the skin is a young field of research. In 2024, a laboratory study on human skin cells showed that the molecule can protect cells from UV stress when applied externally. It worked best in combination with plant compounds that slow its breakdown by CD38 (Kang, 2024). These are promising early results from cell cultures; human studies are expected to follow.

We believe this active ingredient belongs in skincare as part of a combination, not as a solo act. That’s exactly how we developed our new Glow Mask. It brings together retinal from anti-aging research, NAD+ from longevity research, and collagen as a building block. Retinal stands for renewal, NAD+ for energy. If you want to add this molecule to your skincare routine, we believe this combination is the right way to do it. Our article on retinal explains why renewal alone isn’t enough. You can find our existing facial skincare in our shop.

The quieter path lies in what you do every day. Your body makes NAD+ itself, including from vitamin B3 in food (Covarrubias, 2021). Exercise also plays a part. After twelve weeks of endurance or strength training, levels of the key enzyme involved in its production increased in muscle, in both younger and older people (de Guia, 2019). Read our article German Longevity Anxiety to find out why exercise is still often neglected.

Caution is needed with capsules. The molecule itself is digested when swallowed. According to the consumer advice center, as of early 2026 the precursor NMN was not permitted as a dietary supplement in the EU, and an approval process is underway (Verbraucherzentrale, 2026). An analysis of 19 studies on precursors found an effect only on cholesterol and blood lipids, with low-quality evidence (Oliveira-Cruz, 2024). Skincare and exercise, on the other hand, cost little and fit into any week.

NAD+ isn’t a trend that came out of nowhere. This molecule is found in every cell, provides energy, and supports enzymes involved in repair. Research in humans is growing, and there are many reasons to take NAD+ seriously. In our view, an expensive infusion isn’t necessary. A better approach is skincare and everyday habits, with niacinamide and exercise as a well-supported foundation.

That’s why, for us, longevity starts with the basics and with active ingredients that work well together. Our approach is to start with the basics, then combine retinal, NAD+, and collagen rather than relying on individual quick fixes. Our comparison explains the difference between anti-aging and longevity. Read our main article to learn why many people take the wrong approach to skin aging. Find out how protein contributes to healthy aging in our article on protein and longevity.

Remember: energy comes first

• NAD+ is a key active ingredient for longevity, and research is growing
• Consult a doctor before getting an NAD+ infusion
• Niacinamide, exercise, and NAD+ with retinal in your skincare routine are a good place to start