Shares of Eli Lilly (NYSE: LLY) can't seem to stop rallying. For investors thinking about whether to buy the stock, it can be both exciting and discouraging to see it rise. While it's encouraging to see the stock going in the right direction, it's also potentially discouraging to not see it dip in value, where there might be a potential buying opportunity.

Given the stock's impressive gains -- it's up around 80% in just 12 months -- is it too late to invest in Eli Lilly right now? Should investors continue waiting for what may be an inevitable sell-off, or is today still a good time to invest in the healthcare giant?

The biggest reason investors may be turned off rom Eli Lilly's stock is its valuation. These are some of its key value multiples today, and they look downright awful for any value-oriented investors:

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Source Fool.com