When the energy factories inside hair follicles don't work right, they make too many harmful molecules that damage the color-producing cells, making hair turn gray faster.

When the energy factories in our cells don't work right, they leak harmful particles that can damage hair color cells and cause gray hair to show up too early.

Too much stress from oxygen-related chemicals in your hair roots might damage the cells that give hair its color, leading to gray hair — especially when stuff like hydrogen peroxide builds up and harms those color-making cells.

Your hair needs energy from tiny power plants in cells (called mitochondria) to keep making pigment — without healthy mitochondria, your hair can't stay colored over time.

Your hair might thin and turn gray because of the same underlying energy system in your cells — when this system doesn't work well, it can cause both problems at once.

As we age, damage from oxidative stress can harm the cells that give hair its color, especially because the body’s natural antioxidants weaken over time — this leads to grey hair.