Eli Lilly (NYSE: LLY) has been on a tear this past year, rising up to become the most valuable healthcare stock in the world. It soared past UnitedHealth Group and other top healthcare companies in 2023. Its market cap even pushed past electric vehicle maker Tesla this year. This Indianapolis-based healthcare company has firmly established itself as one of the best and brightest growth stocks around.

Let's look at what has investors so excited about this stock, whether investors should worry about its rising valuation, and if this stock has what it takes to help make shareholders a millionaire.

What makes Eli Lilly attractive as a long-term investment is the sheer potential the company has to get bigger. That's a key ingredient for a stock rising in value -- it needs to have a lot of room to run.

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Source Fool.com