Even though the stock market is facing abundant volatility at the moment, established businesses with a clear path forward to future growth can add value and returns to your portfolio again and again over the years. 

If you're looking to add more stocks to your portfolio right now, here are three top healthcare stocks to consider when formulating your list of long-term buys. 

Vertex Pharmaceuticals (NASDAQ: VRTX) has a near monopoly over the multibillion-dollar cystic fibrosis treatment industry with its portfolio of medicines. These medicines, known as CFTR modulators, work to help the CFTR protein function as intended. In a patient with cystic fibrosis, the CFTR gene becomes mutated, which means this protein is not able to function normally.  

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Source Fool.com