There are many ways to determine whether a stock is cheap, but one way of doing so is determining whether there is substantial upside potential for the company. And while the market often bids up shares of companies with excellent prospects, it is possible to find solid stocks still trading at reasonable levels based on their growth potential.

Let's look at two growth stocks with plenty of fuel: Vertex Pharmaceuticals (NASDAQ: VRTX) and Teladoc Health (NYSE: TDOC). 

Biotech giant Vertex Pharmaceuticals has had an impressive stock market performance over the past year. That's partly due to the company's consistently strong financial results, which it owes to its monopoly in the cystic fibrosis (CF) drug market. In the first quarter, Vertex revenue jumped by 13% year over year to $2.37 billion.

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Source Fool.com