• Best Protein Powder
  • Best Protein Powder for Losing Weight
  • How much Protein Does the Body Need


Optimum Nutrition’s 100% Soy Protein is great for many reasons! First, the macro nutrient profile of this protein powder is great for those concerned about removing excess calories from their diet in order to lose weight. This product boasts 25 grams of protein per serving and only 1.5 grams of fat and 1 gram of carbohydrates; which makes 100 out of 120 calories coming from pure soy isolate protein.

A second benefit in using this product is the fact that is has absolutely no cholesterol; because this product is derived from plants, cholesterol will never be an issue like many other protein powders can be. Another important thing to note is that soy is a complete protein, meaning that it has all the essential amino acids which are very important for overall health and muscle.


Lastly, many men worry about soy effecting their estrogen levels; this is a large misconceived myth and many studies have shown that taking soy protein does not affect hormone levels negatively at all! For more information on this see: Is Soy Protein Bad for Building Muscle?


 Value Rating  4.5 Star Rating

Average price of Soy Isolate Protein: $16.22 per pound
Average price of Optimum Nutrition's 100% Soy Isolate: $15.03 per pound

 User Rating  4 Star Rating

Out of more than 140 customer reviews, Optimum Nutrition's 100% Soy Isolate averaged 4.1 out of 5 stars. To see more reviews click here

 Mixability  4.5 Star Rating

Optimum Nutrition has instantized this product, making it very easy to mix together.

 Taste  3.5 Star Rating

Based upon reviews most people can tolerate the taste of this soy protein and there are some people that really enjoy it. The safest flavor to choose if taste is a concern would be Dutch Chocolate.


Soy Protein Isolate - See Protein Type Guide
Lecithin - A non-toxic additive to food that helps ingredients mix together better and improves shelf life.
Acesulfame Potassium - Artificial calorie-free sugar substitute.
Other Ingredients - Natural and artificial flavors, salt.

When to use

General times

Soy protein is great to use at almost any time during the day. The digestion speed of soy is moderate to fast; making it great to take between meals and as a supplement to a meal that is lacking complete protein.

When to use a different type of protein

Even though Soy is great to take throughout the day, there are times when other types of protein will yield better results. For instance post workout the body craves fast digesting amino acids, which whey protein would be ideal for. Another case is before bed when the body needs a protein source that will last a long time, since most individuals go around eight hours with no protein source; in this instance casein protein would be the best because it lasts in the body for around seven to eight hours!