In conclusion, while PQQ may offer a range of potential health benefits, including immune support and antioxidant properties, its role in the context of COVID-19 is still under investigation. As research continues to evolve, PQQ could become a valuable supplement for promoting overall health, particularly for those looking to optimize their immune function during challenging times. However, individuals should always seek guidance from healthcare providers before adding new supplements to their regimen to ensure safety and efficacy.