The following are new investments that those saving for or living in retirement might consider for their portfolios. This week: An ETF that invests in a proprietary index of companies that operate peer-to-peer lending and crowdfunding.

Product developers are becoming increasingly creative in introducing new ETFs in what is already a crowded field, according to Lou Conrad of COMPASS Wealth Management in Concord, Mass. "And some new product launches serve increasingly narrow niches within the ETF industry," he says.

One recent introduction, the Amplify CrowdBureau Peer-to-Peer Lending & Crowdfunding ETF (LEND) is one such fund. LEND is designed to invest in a proprietary index of companies that operate peer-to-peer lending and crowdfunding, as well as provide the underlying technology that allows such networks to operate.

The ETF is highly concentrated in just three equities: LendingTree (TREE), Qudian (QD), and LexinFintech (LX) comprise more than one-half of the fund's assets.

Though the formal crowdfunding industry did not exist that many years ago, Conrad suggests that pre-retirees and retirees evaluate the risks of an investment like LEND in the context of their overall portfolio. "In addition to its lack of diversification from a holding and industry perspective, approximately 50% of its assets are invested in the emerging markets, further heightening the potential volatility of this ETF," he says.

Got questions about the new tax law, Social Security, retirement and/or investments? Email Robert.Powell@TheStreet.com.