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CoQ10 deficiency can present in infancy as a severe encephalomyopathy or multisystemic mitochondrial disease, with features such as hypotonia, developmental delay, intractable seizures, lactic acidosis, cardiomyopathy, and failure to thrive. Reports of infantile‑onset multisystem CoQ10 deficiency describe very early presentations, sometimes in the neonatal period, with rapid neurologic deterioration and involvement of brain, heart, kidney, and liver, and many affected children die in the first months or years of life despite intensive care. The important clinical point is that, although outcomes are often poor in the most severe cases, some infants and young children show neurologic improvement or stabilization when CoQ10 deficiency is recognized early and high‑dose CoQ10 supplementation is started promptly, which is why this diagnosis is considered a treatable cause of infantile encephalomyopathy

CoQ10 is a key mitochondrial antioxidant, and circulating levels are often reduced in people with chronic kidney disease and chronic heart failure, where deficiency is linked to greater oxidative stress and poorer organ function. In CKD cohorts, lower CoQ10 levels correlate with increased cardiovascular risk, and supplementation has been reported to improve markers such as proteinuria, mitochondrial function, and oxidative stress, with some studies suggesting better preservation of kidney function over time. In patients with chronic heart failure, trials such as Q-SYMBIO have shown that CoQ10 supplementation can improve cardiac function parameters and significantly reduce major adverse cardiovascular events, cardiovascular mortality, and heart‑failure–related hospitalizations.

CoQ10 deficiency has been identified as a potentially reversible cause of steroid‑resistant nephrotic syndrome and glomerular nephropathy, particularly in children and young adults with genetic defects in CoQ10 biosynthesis. In reported series, affected patients often present with heavy proteinuria and progressive kidney dysfunction that fail to respond to standard steroid therapy, but genetic testing sometimes reveals mutations in CoQ10‑related genes (such as COQ2, COQ6, or ADCK4). The encouraging part is that in a subset of these cases, early and sufficiently dosed CoQ10 supplementation has been associated with reduced proteinuria and stabilization or partial improvement of kidney function, making it an important, treatable consideration in otherwise unexplained steroid‑resistant nephrotic syndrome.

In some children and young adults, primary CoQ10 deficiency has been linked to hypertrophic cardiomyopathy (HCM), where the heart muscle becomes abnormally thick and stiff despite the absence of more common causes like longstanding hypertension. Case series and reports describe patients with genetically confirmed CoQ10 biosynthetic defects who develop HCM alongside other mitochondrial features such as exercise intolerance, muscle weakness, or neurologic symptoms, and cardiac imaging often shows concentric or asymmetric left ventricular hypertrophy. The hopeful aspect is that early recognition and CoQ10 supplementation have, in some documented cases, led to improved cardiac function or stabilization of wall thickness over time, making CoQ10 deficiency a particularly important and potentially treatable consideration in otherwise unexplained or familial‑appearing HCM.

Low zinc status has been linked to a higher risk and faster progression of age-related macular degeneration (AMD), in part because zinc is concentrated in the retina and supports antioxidant defenses there. In the landmark AREDS trial, a supplement formula containing zinc (80 mg as zinc oxide), along with antioxidants, reduced the risk of progression to advanced AMD by about 25% in people with intermediate disease or advanced disease in one eye over roughly 5 years. Other research has shown that inadequate zinc intake is more common in older adults with AMD, reinforcing the idea that maintaining healthy zinc levels may be an important, and often overlooked, strategy for preserving macular health with age.

Zinc deficiency has been associated with a range of neurological and behavioral changes, including increased irritability, poor attention, and slowed cognitive processing. In children, low zinc status has been linked to poorer performance on tests of attention, memory, and school achievement, and some trials have found that zinc supplementation can modestly improve certain cognitive scores, especially in previously deficient populations. Clinically, even mild zinc deficiency may present with subtle symptoms such as mood changes, reduced stress tolerance, and “brain fog,” which can easily be overlooked but may improve when zinc status is corrected.