Joel ... yes, sometimes the inactive ingredients do something ... but, due to licensing/regulation/FDA/etc, cannot be listed as 'active' without risking lawsuits. Mostly, they're just filler; often, they're necessary for preserving the 'active' ingredient; rarely, the difference between two products - brand name vs generic - is in the 'inactive' ingredients, and the difference in efficacy has been shown ... in limited trials ... and the company is unwilling to spend the extra $$$ required to get this proven to governmental satisfaction.