Potency levels may also be inconsistent, varying significantly from batch to batch of the same product. Unscrupulous manufacturers may add other herbs or fillers to their mixture or may include chemicals designed to disguise the ingredients in products claiming to contain the herb. It is also possible that some products contain contaminants or other harmful substances not listed on the label. The American Cancer Society urges individuals with cancer to remain in the care of qualified doctors who use proven methods of treatment and approved clinical trials of promising new treatments. Patients are encouraged to talk openly with their health care providers about any alternative treatments they are considering, including St. John's wort.
Depression is a serious condition.
Fortunately, treatment can be very valuable. The most effective approach usually involves a combination of medication and counseling by a psychiatrist or other mental health professional. Ask the oncologist, social worker, or psychologist on your care team for a referral. The use of St. John's wort may help some people with mild to moderate depression. Do not change your antidepressant prescription without first consulting your physician.