um CENTRUM IS $hit ...sorry folks.... get an established brand that you cant get at shoprite..... make sure its atleast a 2 a day....one a days clear the system to fast and most sustained release formulas are just hard pressed tabs that decrease absorbtion. VItamin Shoppe, Solgar , Solaray, Carlson, all rep. brands....centrum using crappy forms of vitamins.... poorly absorbed. By splitting the vit up you are makeing sure that you do not over load in one shot on anyone vit, and you are keeping level concentrations in the body. And herbs have been around for 1000's of years....most are well researched just do the homework on them.... ginseng, gingko, all acutally have long term benefits as antioxidants ...not just energy and mental stim abilities