Where to find Medical Studies and Publications?

I am looking for a reputable site (if it exsists?) to find medical studies and publications open to the public?

More specefically, studies relating to fibromyalgia treatments, even more specifically the effects of high-ranking protein diets and amino acids in repair and/or to assist contained by exercise regime?

Answer:
I don't know if these are all free to estimation

PubMed
Cochrane Library
Medline
I Use MedLine and MDConsult Mostly.
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