Enroll in email notifications
Subscribe and Save
Are you looking to shrink fat and build lean muscle? Protein is a key component to provide the building blocks to help achieve your goals.
Whey protein isolate powder is an easy and efficient way to increase your daily protein intake. It is chalked full of all nine essential amino acids required to promote protein synthesis and anabolic processes.
Amino acids bond together to form proteins. There are twenty amino acids found in the human body. Eleven amino acids the body synthesis. Nine of the amino acids the body cannot synthesize and must be consumed. The following nine essential amino acids are ordered from the highest percent content in human muscle mass to the lowest.
The following table relates the amount (in grams) of each amino acid per 100 grams of human muscle and whey protein powder. It also gives the US recommended daily intake (RDA) for an adult in milligrams per kilogram of body weight and calculates the appropriate daily intake for a 180-pound adult.
Amino Acid |
Content in Muscle per 100 grams of Muscle |
Content in Whey Protein per 100 grams Powder |
US Adult +RDA mg/kg body weight |
Total Adult RDA for a 180-pound adult |
Lysine |
6.6 g |
7.1 g |
38 mg/kg |
3.1 g |
Leucine |
6.3 g |
8.6 g |
42 mg/kg |
3.4 g |
Valine |
4.3 g |
3.5 g |
24 mg/kg |
2.0 g |
Phenylalanine* |
3.8 g |
2.5 g |
33 mg/kg |
2.7 g |
Isoleucine |
3.4 g |
3.8 g |
19 mg/kg |
1.6 g |
Threonine |
2.9 g |
5.4 g |
20 mg/kg |
1.6 g |
Histidine |
2.8 g |
1.4 g |
14 mg/kg |
1.1 g |
Methionine** |
1.7 g |
1.8 g |
19 mg/kg |
1.6 g |
Tryptophan° |
- |
- |
5 mg/kg |
0.4 g |
* plus nonessential amino acid tyrosine
** plus nonessential amino acid cysteine
° In acid hydrolysis, tryptophan is decomposed and unable to be detected.
+ US RDA obtained from “Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, Amino Acids.” The National Academies Press. 2005.
Whey is a milk-based protein supplement. Not all whey protein powders contain equal amounts of amino acids.
Whey protein concentrate (WPC) has simply had the liquid removed from liquid whey. The protein content of WPC varies. WPC80 contains 80% protein, 6.6% fat, 5.3% carbohydrates. WPC34 contains 34.4% protein, 3.9% fat, and 50.8% carbohydrates.
Whey protein isolate (WPI) has the liquid removed, too. However, it is a form of whey protein where the proteins are isolated from fat and carbohydrates. WPI contains 90% protein, 0.5% fat, and 0.5% carbohydrates.
WPI’s packed protein content and high bioavailability help to quickly provide additional energy and promote building, repairing, and rejuvenating muscle tissue after strenuous activity. The high levels of valine and phenylalanine help suppress appetite.
SOS conveniently carries high-quality WPI with no added flavors or sweeteners. Add it to your favorite smoothies, yogurt, oatmeal, soups, pancakes, protein bars, or any other recipe to increase your amino acid uptake.
Discover the power of WPI to support losing fat and increasing lean muscle mass while aiding endurance, muscle strength, muscle recovery, and muscle repair. SOS’s WPI power can be purchased on our website or on Amazon.com.
Seek appropriate medical advice before starting any weight loss program including a high protein diet. Whey protein supplementation is generally considered safe. However, long-term side-effects resulting from overconsumption of protein include the risk of developing gout and arthritis from uric acid buildup.
The content of SOS’s website is for information only, not advice or guarantee of outcome. Information is gathered and shared from reputable sources; however, SOS is not responsible for errors or omissions in reporting or explanation. No individuals, including those taking SOS products, should use the information, resources or tools contained within to self-diagnosis or self-treat any health-related condition. SOS gives no assurance or warranty regarding the accuracy, timeliness or applicability of the content.