Humanin

Humanin is a tiny protein that your mitochondria—the powerhouses inside your cells—naturally produce to help protect you from cellular damage and death. Scientists first discovered it in the brain cells of Alzheimer's patients that had somehow managed to survive when surrounding neurons were dying. Think of humanin as your body's own emergency response team that gets deployed when cells are under serious threat.

When your cells face danger from things like toxic proteins, oxidative stress, or aging, humanin springs into action by binding to several different cellular targets. It's like having a master key that works on multiple locks throughout your body. One of its most important jobs is blocking a protein called BAX that would otherwise trigger your cells to self-destruct—essentially humanin tells distressed cells "don't give up yet, help is coming." At the same time, it activates survival pathways that help cells repair themselves and function better.

What makes humanin particularly interesting is how it protects your brain from the toxic amyloid proteins that accumulate in Alzheimer's disease, while also improving the function of your cellular powerhouses. Beyond your brain, it extends this protective effect to your heart, liver, and blood vessels, making it a kind of full-body guardian that helps maintain cellular health as you age.