What are the best stocks? Usually, the ones that have clear paths to success.

Three Motley Fool contributors have identified what they believe are unstoppable stocks to buy in August. And they all happen to be biotech and pharma companies. Here's why they picked Novo Nordisk (NYSE: NVO), Vertex Pharmaceuticals (NASDAQ: VRTX), and Viking Therapeutics (NASDAQ: VKTX).

David Jagielski (Novo Nordisk): Shares of Novo Nordisk have soared more than 450% in the past five years. Despite those impressive gains, the healthcare stock still has much more room to run.

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Source Fool.com