Funds in a health savings account that are not held in savings accounts insured by the Federal Deposit Insurance Corporation are subject to market risk, as is any other investment. While the potential upside from investment gains can be viewed as a benefit, the subsequent downside, as well as the possibility of capital loss, may make the health savings account a poor option for some. And information about the maintenance fees, interest rates and investment lineups of health savings accounts is not easy to find.