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Soy protein is thought to have originated in China over 5,000 years ago. According to Chinese legend, Emperor Shennong declared soy one of the five 'sacred' grains in the year 2853 B.C. The other grains included wheat, millet, rice and barley.
Soy is very high in glutamine and arginine. These two amino acids play an important role in tissue repair, muscle building, and metabolism.
In the U.S., whey protein was discovered as a good source of protein about 25 years ago, as a byproduct of the cheese making process. But whey protein has probably been around for centuries. Archeologists have found evidence of cheese making as early as 6000 B.C., and speculate that the process first developed in the middle east.
Whey contains all of the essential amino acids (ones your body cannot produce on its own), and is a good source of branched-chain amino acids (ones used especially for muscle repair and growth). It also contains quadrapeptides, which have a pain-killing effect and thus can help minimize muscle soreness.
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