In seeking the best stocks in healthcare or cannabis under $20, I look for companies that have consistent revenue growth and a business where there's still plenty of untapped potential, considering long-term trends.

Two that stand out in these categories now are biotech company Exelixis (NASDAQ: EXEL) and cannabis maker Green Thumb Industries (OTC: GTBIF). Both are profitable and growing revenue -- and their shares trade for price-to-earnings ratios below that of most competitors.

Exelixis' shares are down about 12% this year, but considering the S&P 500 index is down 18%, that's not so concerning and helps make the company's shares more reasonable to buy now.

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Source Fool.com