A supplement for depression, mood enhancer?

As above. In addition to medication and psycho therapy excersize can increase endorphin which can help to decrease depressive symptoms.
Not regulated. According to a 2016 review by the American College of Physician's, St John's Wort may be as effective as antidepressants. The problem is that the FDA doesn't doesn't regulate the potency or purity of this or any other supplement . Because of this, it is not generally recommended. St John's Wort can also has potentially dangerous interactions with a number of medications (please check with your Dr.