There are multiple kinds of Vitamin C. If one version of vitamin C does not work for you, here is a list of some alternatives: http://tinyurl.com/Iodine-Supplements
Yes, you are right. Optimal health is a lifetime commitment.
I used to suffer many illness but not any more. Between Vitamin D3, Iodine & our mostly Paleo diet, my wife & I are rarely sick with anything.
For decades, I used to suffer the most terrible chest colds every winter & spring. Not any more. I also recently cured my Candida Asthma with high doses of iodine. No more asthma inhalers! YAY. Story here: //www.curezone.org/forums/fm.asp?i=2183934#i