Pqq (Pyrroloquinoline Quinone) for Cognitive Function

Research suggests that PQQ supplementation may support several aspects of cognitive function, including memory, attention, cognitive flexibility, and processing speed, with the most consistent findings coming from a small number of randomized, double-blind, placebo-controlled trials conducted primarily in middle-aged and older adults experiencing normal age-related cognitive decline. Studies indicate that the benefits may vary somewhat by age, with younger adults potentially showing faster improvements in processing speed and cognitive flexibility, while older adults appear to show more pronounced gains in memory domains. Supporting reviews and preclinical research point to plausible biological mechanisms — including antioxidant activity, mitochondrial support, and neuroprotection — that may help explain these observed effects, and one trial using PQQ in combination with other compounds also reported increases in BDNF, a protein linked to neuronal health. However, the clinical evidence base remains limited by small sample sizes, short study durations, populations drawn largely from a single country, and the fact that several trials were conducted or reviewed by researchers with potential industry ties, so while the overall direction of the evidence is encouraging, broader and more independent replication is needed before firm conclusions can be drawn.