I’ve used a few natural remedies, from cranberry and acidophilus, ginger, Vit D3, elderberry, colloidal silver, raw honey, cayenne pepper, to lavender oil. I haven’t used brewed tea for anything. I hate tea. If my life or health depended on it, I’d learn to drink it though.
Elderberry. My wife gives my son for immunity. Not certain how effective.
colloidal silver — use it in a sinus spray. Not certain how effective.
acidophilis — and other probiotics. Kefir is VERY good here. I recommend it. Good while taking thoses nasty antibiotics. :) Even helps with the stomach flu.
Cranberry — good for urinary issues.
Others...
Resveratrol. Supposed to be the “fountain of youth.” Produced when organism is under stress. Cellular protection. Reduces chromosomal damage. Lab tests in mice show that it prolongs life. Common in grapes, acai.
Neem. Oral for brushing teeth. Has worked wonders on my teeth and gums. Promotes gum health and even causes gums to grow. Also, good topically for various skin ailments. Also, good to ward off internal parasites. Very common in India. All Indians have a tree in their backyard.