Will taking a probiotic pill make you feel less anxious?

Claire Parkinson was desperate to find something to help her young son, Giovanni, cope with his constant digestive gripes, such as painful stomach upsets and wind that had afflicted him since babyhood. 
Despite her initial scepticism, Claire, 31, a mother of three from Lewisham, South-East London, decided to try giving Giovanni, who was 11 at the time, a dietary supplement containing probiotic bacteria, having read about their claimed benefits on the internet. 
Probiotics are live bacteria which, when consumed, are thought to colonise the stomach with bugs that help digestion. Their beneficial effects are not wholly proven, although there is some evidence they might help with a range of problems, including diarrhoea and food allergies.
Claire says the probiotic supplements, provided by OptiBac Probiotics, quickly made a substantial difference to the frequency and intensity of her son's tummy upsets.  But something unexpected also happened. 
The behavioural problems linked to her son's Asperger's syndrome were also significantly reduced, she says.
Asperger's is a form of autism that causes difficulties with communication, interaction and imagination. Asperger's children may have problems relating to others, and have narrow and repetitive patterns of behaviour and interests.

Source  - Daily Mail