How Many Grams of Protein Are in ISO? A Comprehensive Guide

December 6, 2025 •

4 min read

Most ISO protein products deliver between 24 and 27 grams of high-quality protein per scoop, but the precise number of grams of protein in ISO depends on the specific brand and serving size. This variation is due to differences in filtration processes, additional ingredients, and even flavoring.

Quick Summary

ISO protein is a highly refined whey protein isolate with minimal fat and carbs, offering around 25-27 grams of protein per serving, depending on the brand and scoop size. This pure form is ideal for fast absorption, supporting muscle growth and recovery, particularly post-workout.

Key Points

Typical Content: Most ISO protein powders contain 25 to 27 grams of protein per serving, but this varies by brand and specific product formulation.
What is 'ISO'?: 'ISO' is a shorthand term for 'Isolate,' which represents a highly purified protein supplement with minimal fat, carbs, and lactose.
Brand Variations: Reputable brands like Dymatize ISO100 often offer 25 grams of whey isolate per scoop, while others such as ISO Jacked may provide 27 grams per serving.
High Purity: Due to its advanced filtration process, ISO protein is typically over 90% protein by weight, making it a very clean and calorie-efficient source.
Rapid Absorption: The fast digestion and absorption of ISO protein makes it a prime choice for post-workout consumption to quickly deliver amino acids to muscles.
Lactose-Friendly: With minimal to no lactose content, ISO protein is a suitable option for individuals with lactose sensitivity or intolerance.
Supports Weight Management: Because of its low fat and carb content and high satiety, ISO protein is an effective tool for those focused on weight loss or lean muscle gains.

Understanding What "ISO" Protein Means

Before looking at the protein content, it's crucial to understand that "ISO" is not a brand itself but rather a shorthand for "Isolate". In the context of supplements, this almost always refers to whey protein isolate. This form of protein undergoes more intensive processing than standard whey protein concentrate to remove most of the fat, carbohydrates, and lactose. The result is a purer product, with a protein concentration typically measuring 90% or more by weight. This high level of purity explains why isolate proteins are a preferred choice for athletes and individuals on calorie-controlled or low-lactose diets.

How Many Grams of Protein in Common ISO Brands

Because "ISO" refers to a type of protein, not a single product, the grams of protein per serving can vary across different manufacturers. It's always best to check the specific product's nutritional label, but most popular brands fall within a similar range.

Examples of ISO Protein Content Per Serving

Dymatize ISO100®: A very popular brand, ISO100 typically provides 25 grams of hydrolyzed 100% whey protein isolate per scoop. The exact scoop size may vary slightly by flavor, but the protein content remains consistent. It is also known for being low in calories, with less than 1 gram of sugar and fat.
ISO Jacked Ultra: This premium whey blend delivers 27 grams of protein per serving, which comes from a combination of whey isolate, hydrolyzed whey, and concentrate. It is marketed for rapid absorption and muscle growth.
BPI Sports ISO HD: Formulated for easy digestion and absorption, ISO HD provides 25 grams of whey protein isolate per scoop. The brand emphasizes its premium quality and delicious taste.
Applied Nutrition ISO-XP: A highly-regarded isolate, ISO-XP offers 24 grams of protein per 25-gram serving. It is notable for its zero-carb and zero-fat profile, making it extremely lean.

The Benefits of Choosing ISO Protein

Beyond simply knowing the amount, understanding the advantages of isolate can help you decide if it's the right supplement for your needs. The extensive processing offers several key benefits:

Rapid Absorption: Since most non-protein components are removed, the body can digest and absorb the amino acids in isolate protein more quickly than with concentrate. This makes it an ideal post-workout supplement to kickstart muscle repair.
Minimal Lactose: For individuals with lactose intolerance, whey isolate contains very little to no lactose, significantly reducing the likelihood of digestive discomfort like bloating or gas.
Low Calories and Macros: The removal of fats and carbohydrates means that ISO protein provides a clean, calorie-efficient way to increase your protein intake, which is beneficial for weight management and cutting phases.
High Protein Concentration: With a protein percentage of over 90%, you get more protein per scoop compared to less refined options like concentrates.

ISO vs. Whey Concentrate: A Comparison

To better illustrate the unique properties of isolate, here is a comparison with its less processed counterpart, whey protein concentrate.


Feature	Whey Protein Isolate (ISO)	Whey Protein Concentrate
Protein Content	Usually 90% or more	Typically 70-80%
Lactose Content	Very low to none, suitable for intolerance	Moderate, may cause digestive issues for sensitive people
Fat & Carbs	Minimal, extensively filtered out	Higher than isolate, retains more natural fats and carbs
Absorption Speed	Fast-digesting and rapidly absorbed	Digested and absorbed at a slower rate
Purity	Highest purity among whey protein types	Less refined, retains more dairy components
Cost	Generally more expensive due to added processing	More affordable, budget-friendly option

How to Maximize the Benefits of ISO Protein

To get the most out of your ISO protein, consider these best practices for consumption:

Consume Post-Workout: As isolate is fast-absorbing, the ideal time to take it is within 30 minutes after your workout. This provides a quick supply of amino acids to repair and rebuild muscle tissue.
Use Between Meals: For weight management, taking a protein shake between meals can help you feel full and satisfied, curbing unnecessary snacking.
Mix with the Right Liquid: While water is a great low-calorie option, mixing with milk (or non-dairy milk) or adding to smoothies can provide additional nutrients and a richer texture.
Consider Your Goals: For lean muscle growth or weight loss, ISO protein's high protein-to-calorie ratio is highly beneficial. For those aiming to bulk up and who don't have lactose sensitivity, a concentrate might offer a more cost-effective option.

Conclusion

In summary, the number of grams of protein in ISO is most commonly 25 to 27 grams per standard serving, though precise figures depend on the brand. ISO, or protein isolate, is a highly refined and pure form of protein known for its rapid absorption, minimal fat and carbs, and suitability for individuals with lactose intolerance. By providing a powerful and efficient protein source, it is a staple supplement for supporting muscle recovery, growth, and weight management goals. For best results, always check the nutritional information on your specific product and time your intake to align with your fitness routine.

Boost muscle recovery with insights on whey protein isolate from Musashi, a leader in sports nutrition.

Frequently Asked Questions

ISO protein is a more highly filtered version of whey protein, resulting in a product with a higher percentage of protein (90%+) and significantly less fat, carbs, and lactose compared to standard whey concentrate (70-80% protein).

Yes, because the refining process removes nearly all of the lactose, ISO protein is an excellent choice for individuals with lactose sensitivity or intolerance, helping them avoid digestive issues.

Yes, ISO protein can aid in weight loss by increasing satiety, helping to reduce overall calorie intake. Its low-calorie and low-carb profile also makes it ideal for maintaining a calorie deficit.

The rapid absorption of ISO protein makes it most beneficial when consumed post-workout to speed up muscle repair. It can also be taken between meals as a low-calorie, high-protein snack.

The higher price of ISO protein is due to the extra, more intensive filtration process required to remove more fat, lactose, and carbohydrates, resulting in a purer product.

While it is possible to meet protein needs through a regular diet, supplements like ISO protein offer a convenient way for athletes and those with specific fitness goals to easily hit their higher daily protein targets.

While the term "ISO" most commonly refers to whey protein isolate, other isolate protein powders exist, such as soy protein isolate and pea protein isolate, which are derived from non-dairy sources.