Soy Protein Side Effects

One major side effect is that soy protein has been shown to decrease testosterone levels in males

As mentioned in the protein side effects page, one common misconception is that excessive soy protein intake is harmful for the kidneys. However, this protein safety study on male bodybuilders showed that kidney function and excrement were normal. On the other hand, high-protein diets in women have been shown to increase calcium excrement. Calcium supplements are critical for women to take, as shown by this high-protein, high-calcium diet study, where bone tissue loss was minimized.

Is Soy Protein safe?

Yes, soy protein is safe for bodybuilders and competitive athletes, with the exception of the testosterone issue mentioned above. Soy protein has even been shown to delay kidney failure compared to casein protein

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