ANSWER
According to Malaysia Guide to Nutrition Labelling and Claims, the permitted functional claims that can be made on Polydextrose are:
a. Polydextose is bifidogenic.
b. Polydextrose helps to increase intestinal bifidobacteria and helps maintain a good intestinal microflora.
The minimum amount required to achieve the above functional claims is 1.25g per serving.
Reference
Food Safety and Quality Division of Ministry of Health. (2010). Malaysia Guide to Nutrition Labelling and Claims.