St Johns Wort Powder

St Johns Wort (latin name Hypericum perforatum) has been used as a medicinal herb for hundreds of years for a number of conditions. It is a shrub native to Europe and yellow leaves from late spring to early autumn.

St Johns Wort is known to have an influence on many other prescription drugs so before you starting to take St Johns Wort you should consult your doctor or health professional, especially if you are currently on prescription anti-depressants. St Johns Wort can also change the effectiveness of the female contraceptive pill.

See what Wikipedia says:
http://en.wikipedia.org/wiki/St_Johns_Wort