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Quercetin inhibits several respiratory viruses in cultured cells ( In vivo studies indicate that mice inoculated with meningoencephalitis virus are protected from lethal infection by quercetin (30 or 40 mg/Kg BID, po, for 4 days) in a dose dependent manner ( Vitamin C is an essential nutrient involved in a diverse array of immune functions

doi: 10.21037/tau.2019.12.45

You might know this ingredient as Matrixyl

This is especially important for people at risk for multiple deficiencies, including those with GI conditions, a history of gastric bypass surgery, impaired kidney function, older adults, and people taking PPIs

The interaction between drugs and different types of proteins (in vivo) can alter the molecular characteristics of drugs and ultimately activate them