Kava Kava is perhaps one of the best natural remedies for mild to moderate anxiety. The German Commission E Monographs endorse kava as a "safe remedy for anxiety."
For example, an 8 week placebo-controlled study showed that after only 1 week of kava use, anxiety levels decreased 50%. After 4 weeks, anxiety levels were nearly zero. (100mg of standardized kava taken 3 times daily)

Each NSP's Kava Kava capsules contains 200mg of Kava standardized to 30% total kava lactones.

For more serious anxiety problems associated with depression, consider 5-HTP or GABA Plus.