The recent sell-off in commodities markets has left investors unnerved. PowerShares DB Commodity Index Tracking Fund (NYSEArca: DBC) is down about 7% over the past month.

Meanwhile, the bounce in the greenback has lifted PowerShares DB US Dollar Bullish (NYSEArca: UUP), and iShares Barclays 20+ Year Treasury (NYSEArca: TLT) has rallied on lower yields. These are more signs that investors are pulling in risk.

PowerShares DB Commodity Index Tracking Fund