This book focuses on the levels of elements iron, zinc, manganese, vanadium and chromium in different medicinal herbs used in Kenya and their aqueous extracts.It also lists the various diseases these herbs are used to treat.The analysis of elements is done using Atomic Absorption Spectrophotometry and DPASV and correlation curves used to compare the levels of elements in the medicinal herbs and those in the aqueous extract.These levels are then compared to those recommended by the world health organization. The benefits of these elements in immune boosting as well as the side effects due to trace element over load has also been discussed.