My vitamin supplement has 12, 500iu of vitamin a. with 10, 000iu beta-carotene and 2, 500iu palmitate. is that a safe amount?

Yes: One can safely take very large amounts of beta carotene as it is non-toxic. One can suffer adverse consequences by taking more than 10, 000 iu of the palmitate form a day though toxicity is rare unless one ingests at least 25, 000 iu.Day for several months so 2, 500 iu is quite safe. See http://www.Whfoods.Com/genpage.Php?Tname=nutrient;dbid=106.