Zinc is involved in several physiological processes, and it plays a role in the synthesis and regulation of neurotransmitters, including serotonin. Serotonin is a neurotransmitter that is often referred to as the “feel-good” neurotransmitter because it is associated with mood regulation, emotions, and overall well-being. 


  • Tryptophan Conversion: Tryptophan is an essential amino acid that serves as the precursor for serotonin synthesis. Zinc is required for the conversion of tryptophan into serotonin through a series of biochemical reactions. Zinc-dependent enzymes are involved in this process, and adequate levels of zinc are necessary for these enzymes to function properly.
  • Serotonin Transporter Regulation: The serotonin transporter (SERT) is a protein responsible for transporting serotonin from the synapse (the gap between nerve cells) back into the presynaptic neuron, thus regulating the levels of serotonin in the brain. Some research suggests that zinc might play a role in the regulation of SERT activity, which could influence the availability of serotonin in the brain.
  • Receptor Sensitivity: Serotonin acts on specific receptors in the brain, and their sensitivity and responsiveness are crucial for maintaining mood balance. Zinc might affect the sensitivity of these serotonin receptors, potentially influencing how serotonin signals are transmitted and received in the brain.
  • Neuroplasticity: Neuroplasticity refers to the brain’s ability to adapt and change its structure and function in response to experiences and environmental factors. Serotonin is known to play a role in neuroplasticity, which is essential for mood regulation and resilience to stress. Some studies suggest that zinc might contribute to neuroplasticity, potentially impacting mood disorders.
  • Inflammation and Oxidative Stress: Both inflammation and oxidative stress have been implicated in the development of mood disorders. Zinc’s antioxidant and anti-inflammatory properties might indirectly contribute to mood regulation by reducing the negative impact of these factors on brain function.
  • Neurogenesis: Neurogenesis refers to the process of generating new neurons (nerve cells) in the brain. Some animal studies have suggested that zinc may play a role in promoting neurogenesis, which could be relevant to mood disorders by influencing the structure and function of the brain.