how to monitor supplements

I have been reading about iodine and DIM and balancing hormones in this forum! So much great information, but it makes my head spin a bit. I do take numerous vitamins and supplements (D, E, greens, fish oil...) and I am looking for a way to find out about daily requirements and if I am taking the correct amounts. I looked for the Recommended Daily Allowance online, but couldn't find a site that was very comprehensive. Does anyone know of a website that might help me to track my vitamins and supplements, to see if I am overdoing anything or missing anything? Thanks! )