Zinc’s importance for the brain, nervous system, and its therapeutic potential
Zinc is involved in several hundred enzymatic processes that are important for cellular signaling, overall health, and the body’s primary antioxidant defenses. Zinc also plays multiple roles in the brain and nervous system. A deficiency of zinc, as well as disturbances in its metabolism, may therefore contribute to the development of Alzheimer’s disease, Parkinson’s disease, multiple sclerosis, and other neurodegenerative disorders. In addition, there is evidence that zinc supplementation has therapeutic potential, including the protection of nerve cells and the regeneration of damaged neurons. This is highlighted in a review article published in Molecular Neurobiology.
Throughout life, zinc is essential for cellular growth, development, and activity. The mineral is part of several hundred enzymes, various transport proteins, and so-called transcription factors that regulate the activation of a large proportion of the cells’ genes. Zinc is also a component of the primary antioxidant enzyme SOD (superoxide dismutase), which protects cells and tissues from damage caused by oxidative stress. This condition arises when there is an excess of harmful free radicals relative to protective antioxidants. Free radicals are naturally formed during oxygen metabolism and other metabolic processes, and their levels increase significantly with aging, smoking, toxic exposures, and chronic inflammation, which is present in most chronic diseases.
This is why the brain contains significant amounts of zinc
Zinc is important for the development of the fetal brain, and throughout life it is involved in a wide range of neurological functions. It is therefore one of the trace minerals found in the highest concentrations in the central nervous system, only surpassed by iron.
In the brain, zinc homeostasis reflects the local balance of zinc, including its uptake across the blood–brain barrier, the activity of transport proteins that move zinc into cells, and the activation of cellular genes. Zinc thus influences the activity of neurons and stem cells in the brain.
In the review article, the authors describe zinc’s role in the brain and nervous system, including the following:
- Regulation of specific signaling pathways
Including PI3K/Akt and MAPK, which regulate several essential cellular functions - Neurotransmission
The process by which neurotransmitters are released from one neuron and bind to receptors on another neuron to initiate a response - Synaptic plasticity
The brain’s ability to modify and strengthen connections between neurons in response to new physical and mental challenges - Neurogenesis
The formation of new neurons in the central nervous system. In the human brain, stem cells continuously generate new nerve cells and glial cells (support cells)
Additionally, zinc deficiency and imbalances in brain zinc homeostasis appear to increase the risk of developing neurodegenerative diseases such as Alzheimer’s disease, Parkinson’s disease, and multiple sclerosis.
Therapeutic effects of zinc supplementation
In the new review article, the authors refer to a number of controlled studies showing that zinc supplementation has the following therapeutic effects in relation to neuronal damage:
- Improved synaptic activity
Meaning that various signaling molecules function more effectively - Enhanced neurogenesis
Reflecting an improved ability to form new nerve and support cells - Reduction of apoptosis
Apoptosis is the process of programmed cell death in which neurons and other cells are eliminated when they are worn out or damaged by oxidative stress and other harmful influences - Improved memory in cases of neuronal damage
Such damage may occur in connection with aging, oxidative stress, and trauma - Cancer-preventive properties
These are primarily attributed to zinc’s role as an antioxidant, helping to protect cells from DNA damage and subsequent apoptosis
The researchers also discuss zinc’s role in the healing of damaged tissue, wound healing in the skin, and in relation to the side effects of taking certain medications.
The authors therefore conclude that zinc plays an underestimated role in brain and nervous system function, including regenerative and healing processes. They also call for new therapeutic approaches in which zinc is used more specifically in the prevention and treatment of neurodegenerative diseases, as well as to support brain recovery following localized injuries and trauma.
Zinc sources and why deficiencies are common
Zinc is most readily absorbed from shellfish, meat, liver, fish, eggs, and other animal sources. In plant-based foods such as grains, seeds, and legumes, zinc is bound to phytate, which reduces its absorption. As a result, vegans and vegetarians are more likely to develop zinc deficiency. Aging, diuretic medications, antacids, and environmental toxins may also impair zinc absorption or utilization.
It is therefore estimated that nearly half (46%) of the world’s population is deficient in zinc, representing a serious public health concern that may, among other effects, impair the brain and central nervous system.
References:
Sindhoora Bellavi Umesh et al. The Impact of Zinc on cellular Dynamics, Brain Function, and its Therapeutic Potential in Neural Regeneration. Molecular Neurobiology, 2026 Feb 12
Che Li et al. The Important Role of Zinc in Neurological Diseases. Biomolecules. 2023
Simone Passarelli et al. Global estimation of dietary micronutrient inadequacies: a modeling analysis. The Lancet Global Health 2024
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