DNA damage is not an uncommon occurrence. DNA damage is accelerated by exogenous and endogenous sources. Exogenous sources of DNA damage include UV radiation from the sun, polluted air, and pesticides on the food we consume. Endogenous sources of DNA damage include free radical damage caused by oxidative stress.
The majority of humans are exposed to all of these sources of DNA damage and this has become an unavoidable problem we all will eventually face as we grow older and this damage accumulates. DNA damage is happening right now, but the human body has the ability to detect and repair damaged DNA. This happens all of the time in our bodies.
As damage occurs in one cell or section of DNA, a chain reaction of damage is likely to occur leading to inflammation in nearby cells and an increased risk of developing neurodegenerative and metabolic diseases which ultimately lead to a shorter lifespan. Worse, if the damage propagates, mutations can cause cancers.
NMN is a precursor molecule to NAD+ (nicotinamide adenine dinucleotide) which is one of the main characters in powering DNA repair. NAD+ levels do naturally decrease with age, but through NMN supplementation, you can bring your levels back up to keep DNA repair a functioning process of the body.