FYI: Although they have a poor long-term return profile, commodities go through violent boom and bust periods, which opens them up to other strategies to follow those trends. In this piece for Bloomberg I looked at some of those strategies as well as other options for investing in commodities for those looking for this type of exposure.
Regards,
Ted
http://awealthofcommonsense.com/2017/09/if-you-must-invest-in-commodities-heres-how/