Which Myprotein is best for muscle gain? A definitive comparison

October 7, 2025 •

4 min read

Building muscle is a primary goal for many fitness enthusiasts, and protein is a cornerstone of this process. As research indicates, protein is vital for repairing and rebuilding muscle tissue after exercise. With numerous options available, understanding which Myprotein is best for muscle gain depends on your specific fitness targets, dietary restrictions, and budget.

Quick Summary

This article provides a comprehensive comparison of key Myprotein products—Impact Whey, Impact Whey Isolate, TheWhey, and Impact Weight Gainer. It helps individuals select the optimal protein powder based on their unique muscle gain objectives, whether prioritizing lean mass, bulking, or catering to specific dietary considerations like lactose intolerance or veganism.

Key Points

Define Your Goal: Clarify if you are aiming for lean muscle mass or a full bulk before choosing a protein powder.
Impact Whey for Value: Opt for Impact Whey Protein for a budget-friendly, high-quality option that suits most fitness goals.
Isolate for Lean Mass: Choose Impact Whey Isolate if you want the purest protein with minimal fat, carbs, and lactose, ideal for cutting.
TheWhey for Performance: Serious athletes can benefit from TheWhey, a premium blend with rapid and sustained absorption for optimal recovery.
Gainer for Bulking: Use Impact Weight Gainer if you struggle to eat enough calories to fuel mass and strength increases.
Consider Vegan Alternatives: Plant-based protein blends, like the Myprotein Vegan range, offer complete amino acid profiles for non-dairy diets.
Prioritize Total Daily Intake: Focus on distributing protein intake throughout the day rather than obsessing over a narrow post-workout 'anabolic window'.
Combine with Creatine: Enhance your physical performance and strength gains by pairing your protein shake with creatine monohydrate.

Decoding Your Muscle Gain Objectives

Before selecting a protein powder, it is essential to define your fitness goals. Muscle gain is not a one-size-fits-all process. An athlete focused on lean muscle mass for performance will have different needs than someone focused on increasing overall size and weight through bulking.

Goal 1: Lean Muscle Gain: If your aim is to build muscle while keeping body fat low, you need a high-protein, low-fat, and low-carbohydrate supplement. This allows for increased protein intake without adding unnecessary calories that can contribute to fat accumulation.
Goal 2: Bulking (Mass Gain): For individuals who struggle to consume enough calories to gain weight, a high-calorie protein blend that includes carbohydrates and fats is the most effective choice. This ensures you are in the necessary caloric surplus to fuel muscle growth.
Goal 3: Dietary Restrictions: If you are lactose intolerant, follow a vegan diet, or simply have dietary preferences, you will need to consider specialized products that do not rely on dairy whey.

Key Myprotein Products for Muscle Growth

Myprotein offers a diverse range of products designed to cater to different fitness needs. Here is a breakdown of their primary offerings for muscle building.

Impact Whey Protein

As Myprotein's best-selling and most versatile option, Impact Whey Protein is an excellent, budget-friendly choice for most individuals. This whey concentrate provides a solid nutritional profile for daily use and effective post-workout recovery. Each serving is rich in protein and naturally occurring branched-chain amino acids (BCAAs). While it contains slightly more fat and carbs than its isolated counterpart, it offers superb value and comes in a vast array of flavors.

Impact Whey Isolate

This product is a more refined version of whey protein concentrate, undergoing extra filtration to deliver a higher protein content with minimal fat and lactose. It is an ideal option for those who are watching their calorie intake, are in a cutting phase, or have a slight lactose sensitivity. Impact Whey Isolate offers rapid absorption, making it perfect for kickstarting muscle repair immediately after an intense workout.

TheWhey

Marketed as a premium protein shake, TheWhey contains a blend of whey protein isolate, concentrate, and hydrolysate. This powerful combination provides a tiered absorption rate, with hydrolysate being digested quickly and concentrate/isolate providing a sustained release. It also includes MyZyme® digestive enzymes for enhanced protein absorption and is suitable for serious athletes seeking the highest quality and purity.

Impact Weight Gainer

For those with mass gain or bulking goals, the Impact Weight Gainer is specifically formulated with a powerful combination of high-quality protein and complex carbohydrates. It is a calorie-dense shake designed to help you meet the caloric surplus needed for significant size and strength increases. The blend includes both fast and slow-release proteins to support muscle growth throughout the day.

Vegan and Plant-Based Proteins

Myprotein provides several options for those following a vegan diet. Their Impact Vegan Protein blend combines various plant-based proteins, such as pea and brown rice, to deliver a complete amino acid profile. This ensures that individuals on a plant-based diet can still effectively meet their protein needs for muscle repair and growth.

Comparison Table: Which Myprotein is Best for Muscle Gain?

To help you decide, here is a quick comparison of the top Myprotein choices for muscle gain.


Feature	Impact Whey Protein	Impact Whey Isolate	TheWhey	Impact Weight Gainer
Protein Type	Whey Concentrate	Whey Isolate	Isolate, Concentrate, Hydrolysate Blend	Protein & Carb Blend
Protein Content	~21g per serving	~23g per serving	~25g per serving	~31g per serving
Carbs & Fat	Moderate	Very Low	Low	High (for bulking)
Ideal For	Everyday use, maintenance, budget-friendly	Cutting, lean muscle, low lactose	Elite athletes, maximum absorption	Bulking, mass gain, high calories
Absorption Rate	Fast	Very Fast	Tiered (Fast & Slow)	Varies (blend)
Cost	Most Affordable	Higher than Impact Whey	Premium	Varies based on size

Beyond the Powder: Diet and Timing

While choosing the right protein powder is important, it's just one piece of the puzzle. Maximizing muscle gain also depends on your overall nutrition and training strategy.

Calorie Surplus: To build muscle, you must consume more calories than you burn. A protein powder helps hit these macros, but it cannot replace a healthy, balanced diet of whole foods.
Protein Timing: While the classic 'anabolic window' idea suggests immediate post-workout consumption, modern research indicates a broader period of up to several hours after exercise is beneficial. Spreading your protein intake throughout the day—around 25-40 grams per meal—can be more effective for maintaining consistent muscle protein synthesis.
Complementary Supplements: Many users combine their protein powder with other supplements like creatine monohydrate, which is proven to increase physical performance in high-intensity exercise.

The Verdict: How to Choose Your Myprotein

Ultimately, the best Myprotein product for muscle gain depends on your specific circumstances.

For a versatile, cost-effective all-rounder, Impact Whey Protein is the best choice for most people.
If your primary goal is lean muscle and minimizing fat, Impact Whey Isolate is the superior, though slightly more expensive, option.
Athletes seeking a premium, fast-absorbing blend for optimal recovery should consider TheWhey.
For those in a serious bulking phase, Impact Weight Gainer provides the necessary calories and macros to fuel mass increase.
Finally, Myprotein's Vegan Protein range ensures those with plant-based diets or lactose intolerance have high-quality options for muscle growth.

For a full guide to their supplements and other nutritional advice, consult the Myprotein website.

Conclusion

Choosing the right protein supplement is a personal decision based on your unique training goals, dietary needs, and budget. For general muscle gain, Myprotein's Impact Whey provides excellent value, while Impact Whey Isolate is ideal for lean mass. Serious athletes might prefer the advanced formula of TheWhey, and dedicated bulkers will benefit from Impact Weight Gainer. Combined with a consistent, well-balanced diet and proper training, the right Myprotein product can significantly support your muscle-building journey.

Frequently Asked Questions

The main difference is the filtration process. Impact Whey Isolate undergoes more rigorous filtration, resulting in a higher protein content (over 90%), significantly less fat, and lower lactose compared to standard Impact Whey concentrate.

Impact Weight Gainer is specifically formulated for mass gain and bulking, providing a high dose of calories from both protein and carbohydrates. For lean muscle gain, Impact Whey Isolate or regular Impact Whey is a more suitable choice due to their lower calorie, fat, and carb content.

While consuming a protein shake within a few hours post-workout is beneficial for muscle repair, it is more important to ensure a consistently high protein intake throughout the day. Spreading out 25-40 grams of protein per meal is an effective strategy.

Yes, Myprotein offers effective plant-based options like their Vegan Protein Blend, which combines proteins like pea and brown rice to provide a complete amino acid profile necessary for muscle growth. Consuming a variety of plant proteins can ensure you get all essential amino acids.

TheWhey is a premium blend combining isolate, concentrate, and hydrolysate for a tiered absorption effect, enhanced by digestive enzymes. Impact Whey Isolate is a pure, single-source protein, ideal for cutting and those sensitive to lactose.

While older studies suggested a limit, more recent research indicates that your body can utilize larger doses of protein, especially from slower-digesting sources. Spreading protein intake evenly throughout the day is generally the recommended approach for maximizing muscle synthesis.

Many Myprotein products, including some versions of Impact Whey Isolate, are Informed-Choice certified. This guarantees they are regularly tested for banned substances, offering confidence for athletes who undergo drug testing.