AbbVie's returns haven't been great this year, but investors shouldn't overlook this promising growth stock.Nvidia (NVDA 2.57%) has been a great stock to own, and it could remain that way for long-term investors. However, the problem is that it's trading at nearly 40 times its future profits. At such a high valuation, it sets a high bar for the business and effectively prices in a lot of future growth already. It could make it difficult for the stock to continue to generate high returns. Even if it does, at ...