Blackberry leaf

Blackberry leaf has many traditional uses, and it is officially approved in Germany for treating certain health conditions. Blackberry leaves can be made into tea or used as a mouthwash and gargle solution, according to Flora Health. Tannins in blackberry leaf are responsible for some of the beneficial effects, tannins can cause liver damage if taken in large amounts over long time frames. Consult a qualified healthcare provider before using blackberry leaf supplements.