Analysts' price targets can give investors some insight into how much bullishness and excitement there is behind a particular stock. But investors should be careful in relying too much on price targets as they can -- and do -- change over time. So what might look like a great stock today may not be nearly as promising in several months' time.

A couple of stocks that have upside of 90% or more, according to analysts, are Plug Power (NASDAQ: PLUG) and Ginkgo Bioworks (NYSE: DNA). Are they right about these stocks, and are they good buys right now?

Plug Power develops hydrogen fuel cell systems that can replace batteries. It's a clean energy play for investors and one that could lead to significant growth opportunities.

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Source Fool.com