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...
This light box from Lumie is a great way to absorb (safe) light rays into your body. Ideal to use for 30 to 60 minutes at home, it helps treat circadian rhythm disorders, the main cause of SAD. Lumie.
The Sun Meadow room, at the K West Spa, London, is a specialist light therapy which helps alleviate the symptoms of SAD. While you enjoy a relaxing massage, a UV lamp will shine on you from above, boosting the body's Vitamin D levels. Website: K West Spa.
The Valkee ear phones hit the headlines recently as it was successfully trialed on SAD sufferers. It works by sending light sensors through the ear phones into the brain. Website: Valkee.
A Rio Light Mask works by sending light pulses through the eyes via a soft mask. These pulses can be controlled by a remote and switches off automatically after 15 minutes. Website: Light Mask.
This gentle light is designed to ease you out of bed. The soft rising light wakes you gradually and has a choice of 4 natural and pleasant wake-up sounds. You can add new sounds and music via USB. Website: Philips.