Quickly meet your daily protein needs—before or after a workout—with our high-quality, fast-digesting whey isolate.

BBCOM Editors
January 6, 2025

What is Whey Isolate?

Whey protein is the benchmark standard for those wanting to consume more protein and build muscle. Whey isolate is a milk-based, whey protein product with a large amount of protein and minimal amounts of fat, carbs, and lactose. 

Why Do People Take Protein?

Protein supplements can be beneficial for almost everyone. Protein powders are commonly used by athletes, gym goers, and anyone who wants to improve their health and well-being. Protein can not only help with meeting your daily dietary requirement, it can help you build muscle, lose weight, recover faster, and it's convenient to consume before or after a workout.    

Why Choose Whey Isolate? 

Whey isolate contains around 90-95% protein by weight, compared to 70-80% protein in whey concentrate. It has a lower fat content of just 0.5g and a low carbohydrate content with only 1 carb. Whey isolate typically contains  less than 1% lactose and is usually suitable for people with lactose intolerance or those on low-carb, low-fat diets. 

Many athletes choose whey protein isolate because it’s faster absorbing, quicker digesting, and because it produces a more rapid response for protein synthesis. Whey protein is a complete protein with high levels of the essential and branched chain amino acids that can be readily used by the body.[1] Whey is absorbed within 60 minutes of digestion, while casein, soy, and egg proteins take several hours.[2] Additionally, whey has the highest per gram/hour absorption rate with 9 grams, compared to casein with 6 grams, soy with 4 grams, and cooked eggs with 3 grams.[3] This quick absorption can lead to higher amino acid availability and therefore greater ability for protein synthesis and overall muscle growth.[4]

Why Choose Signature 100% Whey Isolate?

Bodybuilding.com Signature 100% Whey Isolate packs a powerful 25 grams of protein and just 2g of carbohydrates and 0.5g of fat per 30-gram scoop. It’s also formulated with 11.9g of essential amino acids (EEAs) and 5.5g of branch chain amino acids (BCAAs). Our high-quality, 100% Whey Isolate is made with ingredients exclusively sourced from U.S. farms.

Why Take Protein After a Workout

The post-workout consumption of whey has been extensively shown to increase muscle strength, size, and performance, while also helping decrease muscle soreness and body fat.[5]  The rationale behind its effectiveness is the high amount of leucine, which has specifically been shown to greatly impact protein synthesis and muscle growth.[6] One 30-gram scoop of whey protein has approximately 3 grams of leucine,shown to trigger an anabolic response.

Takeaways

Whey protein powder is a more refined version of whey protein that is quick to digest and absorb. Its high protein content makes it ideal for those looking to build muscle, lose weight, or optimize recovery while minimizing your intake of fat, carbs, or lactose. 

References

1. Hoffman, J. R., & Falvo, M. J. (2004). Protein - Which is Best?. Journal of sports science & medicine, 3(3), 118–130.
2. Dangin, M., Guillet, C., Garcia-Rodenas, C., Gachon, P., Bouteloup-Demange, C., Reiffers-Magnani, K., Fauquant, J., Ballèvre, O., Beaufrère, B. (2003). The Rate of Protein Digestion affects Protein Gain Differently during Aging in Humans. The Physiological Society.
3. Hoffman, J. R., & Falvo, M. J. (2004). Protein - Which is Best?. Journal of sports science & medicine, 3(3), 118–130. 
4. Wilson, J., Wilson, G.J. Contemporary Issues in Protein Requirements and Consumption for Resistance Trained Athletes. J Int Soc Sports Nutr 3, 7 (2006). https://doi.org/10.1186/1550-2783-3-1-7
5. Miller, P. E., Alexander, D. D., & Perez, V. (2014). Effects of whey protein and resistance exercise on body composition: a meta-analysis of randomized controlled trials. Journal of the American College of Nutrition, 33(2), 163–175. https://doi.org/10.1080/07315724.2013.875365
6. Breen, L., & Churchward-Venne, T. A. (2012). Leucine: a nutrient 'trigger' for muscle anabolism, but what more?. The Journal of physiology, 590(9), 2065–2066. https://doi.org/10.1113/jphysiol.2012.230631