How sunlight affects your NAD+ and protects your cells
Did you know that a little sunlight is good for your health? It helps your body produce vitamin D, boosts your mood, and can even improve your sleep. Too much sun does the opposite. Bright light and UV radiation put stress on your cells and can cause damage.
This strain directly affects your NAD+, a compound your cells need to produce energy and repair themselves. When NAD+ decreases, your body becomes more sensitive to stress and aging.
In this article you’ll read how sunlight affects your cells, what role NAD plays in that, and what you can do yourself to better protect your skin and cells.
The damage caused by UV radiation
Sunlight consists of three types of UV radiation: UVA, UVB, and UVC. The most harmful variant (UVC) is completely blocked by the ozone layer and does not reach us. UVB is largely filtered out, but a small part reaches your skin and can cause surface damage such as redness and sunburn.
UVA is the most persistent form of UV radiation. These rays penetrate deeper into the skin and can affect cells on a much more fundamental level.
When UVA and UVB penetrate your skin, they can:
- damage DNA
- weaken protective proteins in the skin
- put extra strain on cells
- slow down skin repair
When that repair doesn’t go well, it speeds up the aging process. Think fine lines, dark spots, and loss of firmness. But the real impact happens deeper down, in the cells themselves, where energy production and repair processes become disrupted.
What is NAD+ and why is it important?
NAD+ is a compound found in every cell. You can think of it as a helper substance that enables cells to produce energy and repair themselves. Without enough NAD+, all kinds of processes in your body run more slowly or less efficiently.
Sunlight directly affects NAD+. According to a review in the International Journal of Molecular Sciences, NAD+ is used by the body in large amounts when cells have to repair UV-radiation damage. This leads to faster depletion of stores and means cells have less energy to repair themselves.
Fania and colleagues describe that an NAD+ deficiency is associated with lower resilience of skin cells. When NAD+ drops, repair processes slow down and the skin may become more sensitive to the negative effects of sunlight. This explains why prolonged exposure to UV radiation can lead to extra damage when NAD+ levels in the body are already under pressure. ¹
The role of NMN in NAD+
NMN is a direct precursor of NAD+. Your body converts NMN into NAD+, which can help support your natural NAD+ stores. People who use NMN often do so as part of a healthy lifestyle focused on recovery, energy, and slowing aging.
When choosing an NMN product, quality matters. A pure form, good stability, and transparent manufacturing contribute to reliability. View our range of NMN products.
Sirtuins: the protectors of your cells
Sirtuins are enzymes that help keep your cells healthy. They play a role in DNA repair, reducing inflammation, and slowing aging. You can think of them as a maintenance team that is constantly working to safeguard balance in your cells.
Sirtuins require NAD+. Without enough NAD+, these enzymes can’t do their job properly. As you get older, natural NAD+ levels decline. That means sirtuins become less active and your cells are more sensitive to stress and damage—especially with prolonged exposure to sunlight.
According to research by Imai and Guarente in Trends in Cell Biology, higher sirtuin activity shows that cells are more resistant to aging. Because sirtuins depend on sufficient NAD+, the researchers point out that supporting your NAD+ level may contribute to healthier aging.²
That’s why it can be valuable to keep your NAD+ stores up, so sirtuins can work optimally and your cells remain better protected.
How to protect yourself in the sun
The sun is wonderful, and time outdoors does a lot of good for your body and your mood. Still, it’s important to be mindful about sunlight so you can enjoy it without putting unnecessary strain on your skin and cells. With a few simple choices, you can protect yourself well and still fully benefit from the sun.
Cover up in time
After ten to fifteen minutes in the sun, it’s wise to keep your skin covered or go into the shade.
Use sunscreen with SPF
An SPF of 15 or higher gives your skin more protection against UVA and UVB. This reduces the risk of DNA damage.
Limit long periods in bright sunlight
Between 12:00 and 15:00 the sun is strongest. Try to avoid these hours.
Support your recovery
After a day in the sun, healthy nutrition, enough physical activity, and good sleep can contribute to stronger cellular recovery. A supplement such as NMN can help support your NAD+ level when your cells are under extra strain.
Protect your cells and support your NAD+
Sunlight is important for your health, but too much UV radiation can strain your cells and lower your NAD+. By being mindful about sunlight and protecting your skin well, you help your body keep NAD+ levels stable.
Want to give your cellular health extra support? Then it may be worth seeing whether a high-quality NMN supplement fits your lifestyle. Discover our range of NMN products and read how they can contribute to a healthy NAD+ balance.
Sources
¹ Fania, L., Mazzanti, C., Campione, E., Candi, E., Abeni, D., Dellambra, E. (2019). Role of Nicotinamide in Genomic Stability and Skin Cancer Chemoprevention. International Journal of Molecular Sciences. https://pmc.ncbi.nlm.nih.gov/articles/PMC6929077/
² Imai, S., Guarente, L. (2014). NAD and sirtuins in aging and disease. Trends in Cell Biology. https://pubmed.ncbi.nlm.nih.gov/24786309/
