From the NHS website:
"There's evidence that foods containing certain added ingredients, such as plant sterols and stanols, can reduce levels of cholesterol in the blood.
Sterols and stanols can be found in specially developed products, such as some spreads and yoghurts.
These foods are aimed at people who need to lower their cholesterol levels. People who don't have high cholesterol shouldn't eat these products regularly, particularly children and pregnant or breastfeeding women.
If your doctor has told you that you have high cholesterol, you can lower it by changing your diet without having to eat special products.
If you do eat foods that are designed to lower cholesterol, read the label carefully to avoid eating too much"
Source:
http://www.nhs.uk/Livewell/Healthyhearts/Pages/Cholesterol.aspx