Yes, comfrey is very nice. I lament the loss of my plants :(

One should be careful in consuming it. Some studies have shown that prolonged use can cause liver damage. Thus it is usually used externally, rather than internally.

For colds, garlic, garlic and garlic! Along with honey, ginger and cinnamon. And good ole home made chicken soup. That's my trick. Oh, and of course, herbal teas and green tea help perk you up.

ironically, I have recently succumbed to a sore throat! Doggone it.