If you are on any medication, please double check with your GP as it is contraindicated with certain medicines.
It also takes a few weeks to take effect so please allow sufficient time to decide whether or not it suits you.
If St John's Wort is not suitable you may like to try Jan de Vries's Mood Essence, a combination of flower essences for feeling generally unhappy, negative, despondent and sad. Taken regularly it aims to uplift and bring back an optimistic and enthusiastic outlook.
Take this in conjunction with lifestyle changes aimed at boosting serotonin levels.