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From Raw Power, by Stephen Arlin (Maul Brothers Publishing, San Diego, CA, third ed. 2002), page 55:
"Pumpkin seeds are one of the most important seeds for muscle building. In addition to having many other health benefits, they contain myosin, the main protein that makes up almost all the muscles in the body and plays an important role in muscle contraction."
A suggestion on the same page is to make raw pumpkin seed butter. "It tastes like peanut butter but is much healthier."
Blessings,
-Donna