Fasting on solids & only taking liquids works well. Fasting is a great cleanser & digestion expends a lot of energy.

Alternatives like homeopathic remedies or herbs work very well, but they have to be taken at first sign, which is easily missed. First sign may be a few days before actual symptoms, so you have to have a very good sense of your body. If it’s too late & you’ve full blown symptoms, go for something OTC.

Multivitamins are essential and I would only shop at health food store–you’d be amazed what else is in them like binders in mainstream brands.

And Emergen-C is indispensable, Google it. This as well as a multivitamin.