Glucomannan fiber: Add to Ephedra or Take By Itself
Thousands of weight loss products scream for your attention but only one adds to the effectiveness of ephedra or can be taken along as an way to :

Lower weight
Lower cholesterol
Relieve chronic constipation

In order to separate the hype and aggressive marketing techniques from the truth, [...]

I found great info about Glucomannan, which is the main ingredient in FibraSlim:
Glucomannan - Uses and Side Effects
Glucomannan is used to manage constipation, diabetes, obesity, hypercholesterolemia, and hyperlipidemia. It’s also used to induce weight loss. 
Mike Hussey
March 19, 2008
Glucomannan is a water-soluble polysaccharide composing 40% by dry weight of the roots or corm of the konjac [...]