What's the best thing to do at home for common colds?

Pelargonium sidoides: The herb pelargonium sidoides, the root of a geranium native to south africa, is the best-proven treatment for colds, sinus infections & sinusitis. It's the first thing i (& my family) take when getting sick & has helped hundreds of my patients. It is widely available in a product called umcka, sold at health food stores & many pharmacies. See http://naturalmedicinejournal.Net/pdf/nmj_dec09_bp.Pdf.