Which of the following herbal medications is indicated for depression, and improves the immune system?

Kava
St. John's wort
American ginseng
Cranberry

St. John's wort

Rationale: St. John's wort is an herbal medication indicated for depression, and to improve the immune system. Kava is used for ADHD, anxiety, and sedation. American ginseng is used for stress, energy, and as an immune system builder. Cranberry is used for urinary tract infections.