This ETF is one of several funds that offers exposure to the U.S. health care sector, a corner of the domestic stock market that has historically exhibited relatively low volatility and can occasionally offer attractive dividend yields. As a sector-specific fund, IYH probably doesn't have much use for those constructing a long-term, buy-and-hold portfolio; this ETF is a more useful tool for those looking to establish a tactical tilt towards health care or for use in a sector rotation strategy. Beware the significant concentration in this fund; though IYH has more than 100 stocks in the underlying portfolio, a relatively small handful account for a big portion of total assets. Another potential drawback of IYH is the fees; both XLV and FHC offer generally similar exposure with considerably lower expense ratios. For a similar price, the equal-weighted RYH offers a way to steer clear of the significant concentration. There are better ETF options out there for health care exposure; it's probably best to choose one of the other funds mentioned above.