Yeah I know, I've been experimenting with various things. You could say why do I need Vitamin C, it also is listed simply as anti-oxidant by most sources yet its the only thing which makes me feel better short-term and long term. In short, I've had to try everything, vitamin A supplements was one stage of my 'experiments' and I know everything about it (well enough I need to know). Besides, if I die, its a plus.