Free radicals may sound like troublemakers, but they play a significant role in cellular dynamics. Mitochondria not only produce antioxidants like glutathione and melatonin, which combat oxidative stress, but also regulate gene expression and neurotransmitter production, influencing mood and communication between neurons. The fascinating history of mitochondria dates back 2.5 billion years, when oxygen was scarce, highlighting their essential role in the evolution of life as we know it.
