Neurodegenerative diseases such as Alzheimer’s disease, Parkinson’s disease, and amyotrophic lateral sclerosis represent one of the greatest challenges of modern medicine. Their development is associated with progressive neuronal damage, leading to impaired memory, concentration, and motor function. Oxidative stress and chronic inflammation play key roles in these processes, gradually disrupting the nervous system’s functioning and accelerating its aging. However, increasing attention is being paid to natural plant compounds that may support brain protection and serve as part of preventive strategies. One of the most promising is hesperetin—a flavonoid found in citrus fruits such as oranges, mandarins, and lemons.
Hesperetin, the active form of hesperidin, is known for its strong antioxidant and anti-inflammatory properties. Of particular importance is its ability to cross the blood–brain barrier, allowing it to act directly within the nervous system. This is why it is increasingly considered a potential agent for protecting neurons from damage.
One of the main factors accelerating neurodegenerative processes is oxidative stress, resulting from excessive production of free radicals. These are generated not only during natural metabolic processes but also under the influence of chronic stress, environmental pollution, or an improper diet. Hesperetin acts in a multi-target manner: it neutralizes reactive oxygen species, enhances the body’s natural antioxidant defenses, and activates cellular protective pathways. As a result, it helps protect neurons from damage and supports their proper functioning.
An equally important element in the development of neurodegenerative diseases is chronic inflammation within the brain neural tissue. Hesperetin can reduce it by lowering pro-inflammatory cytokine levels, inhibiting inflammatory signaling pathways, and decreasing excessive microglial cell activation. In this way, it may help maintain balance in the nervous system and limit processes leading to further neuronal damage.
This compound also influences mechanisms responsible for the regeneration and maintenance of proper neuronal function. It supports autophagy—the process of removing damaged cellular components—modulates microRNA expression, and activates signaling pathways related to neuronal survival. Disruptions in these processes are characteristic of diseases such as Alzheimer’s and Parkinson’s, which further highlights the potential of hesperetin in their prevention.
Current research demonstrates that hesperetin acts in a multifaceted manner: it provides robust neuronal protection, maintains cognitive function, and contributes to slowing neurodegenerative processes. While most available data originate from preclinical studies and its effectiveness in humans requires further confirmation, it stands out as one of the most promising natural compounds for supporting brain health and optimal neurological function.
