Sales of a "mood boosting" supplement have increased drastically because of the terrible British weather, figures suggest.
Sales of St John's Wort increased by 115% in June this year - the wettest June on record - compared to June 2011.
Schwabe Pharma UK, manufacturer of St John's Wort supplement KarmaMood, said the unseasonably wet weather may have led to an increase in the number of cases of seasonal affective disorder (SAD).
Do you know which supplements can have nasty effects? (scroll down)
Oxfordshire GP Dr David Edwards said: "After an initial burst of sunshine in March people were lulled into a false sense of security that summer was just around the corner.
"However, due to the unseasonably poor weather in May and June people who already have a major problem with depression have been having relapses, and patients at the other end of the spectrum have been attending GP surgeries reporting that they are 'tired all the time'."
Do you suffer from SAD? Take a look at these effective light therapies that help alleviate the symptoms...
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