Probably better to just get Quercetin extract rather than rely on Ginko which may have varying levels of Quercetin. You should be taking your vitamin D regularly, not just stocking it as it will be too late if you start when you feel symptoms. Hold off on taking Zinc in large doses as it IS a poison. Long term use can cause big problems. But, you can take Quercetin prophylactically as it has some nice properties all by itself, and just add Zinc when a sniffle threatens.
Thanks, I AM taking D3; I’ll look into Quercetin.