Mass gainers are a convenient way for hardgainers, athletes, and individuals with high metabolisms to consume the high number of calories needed to build mass. While both Optimum Nutrition's Serious Mass and GNC Pro Performance Bulk 1340 (often referred to as 'Pro Bulk') serve this purpose, a closer look at their formulations reveals some key distinctions.
Optimum Nutrition Serious Mass
Optimum Nutrition Serious Mass is a well-established mass gainer known for its very high-calorie content and straightforward formula aimed at promoting weight gain and muscle building. A typical two-scoop serving delivers over 1,250 calories, 50 grams of protein, and over 250 grams of carbohydrates. Its protein blend comes from quality sources including whey protein concentrate, calcium caseinate, and egg albumen. The primary carbohydrate source is maltodextrin, a simple carb designed for rapid glycogen replenishment. Additionally, Serious Mass includes 5 grams of creatine monohydrate per serving to support strength and performance. It is also fortified with over 20 essential vitamins and minerals, which is a significant advantage for those looking to supplement their diet with micronutrients. Its primary use is as a post-workout shake or a convenient high-calorie snack between meals.
GNC Pro Performance Bulk 1340
GNC Pro Performance Bulk 1340 is another potent mass gainer that packs a substantial caloric punch. With 1,340 calories per serving, it slightly edges out Serious Mass in the total calorie department. It also contains 50 grams of high-quality protein per serving, derived from a more complex blend that includes whey protein concentrate, isolate, milk protein isolate, calcium caseinate, and egg albumen. The carbohydrate blend is also high in maltodextrin but may vary slightly by formula. Notably, Bulk 1340 emphasizes a "banned substance tested" certification, which is a key selling point for competitive athletes who undergo drug testing. The creatine content is lower at 1 gram per serving, but it is supplemented with BCAAs and 10 grams of glutamine for muscle recovery and immune support. This product is marketed towards individuals with intense training regimens who prioritize recovery and ingredient quality assurance.
Serious Mass vs. Pro Bulk: A Direct Comparison
| Feature | Serious Mass (Optimum Nutrition) | Pro Bulk 1340 (GNC) |
|---|---|---|
| Calories (per serving) | 1,250+ | 1,340 |
| Protein (per serving) | 50g | 50g |
| Carbohydrates (per serving) | ~250g | ~279g (varies) |
| Primary Carb Source | Maltodextrin | Maltodextrin, rice starch |
| Creatine | 5g | 1g |
| Added Nutrients | 20+ vitamins & minerals | Glutamine, BCAAs, some vitamins |
| Quality Assurance | Informed Choice (Banned Substance Tested) | Banned Substance Tested (LGC protocol) |
| Target User | Hardgainers, those needing high caloric intake | Athletes, intense trainers prioritizing recovery |
Nutritional Composition
Both gainers provide a similar amount of protein (50g), but Pro Bulk offers a higher calorie count, potentially due to a greater carbohydrate load. The source of these carbohydrates for both is primarily maltodextrin, which is a simple carb that spikes insulin levels. Serious Mass is more fortified with a wide range of vitamins and minerals, while Pro Bulk includes specific amino acids like BCAAs and glutamine in its formula, which may offer more targeted recovery benefits.
Added Performance Ingredients
One of the most significant differences lies in the added performance ingredients. Serious Mass contains a more substantial dose of creatine monohydrate at 5 grams per serving. For individuals focused on boosting strength and power, this is a distinct advantage. In contrast, Pro Bulk includes only 1 gram of creatine but adds a more significant amount of glutamine, an amino acid important for muscle recovery and immune health. The inclusion of BCAAs in Pro Bulk is also a plus for muscle synthesis and reducing fatigue.
Quality Assurance and Testing
Both products claim to be tested for banned substances, which is important for competitive athletes. Optimum Nutrition's Serious Mass is Informed Choice certified, while GNC Pro Performance Bulk 1340 is tested via LGC skip lot testing protocol. This level of quality assurance can give athletes peace of mind, although it's always wise to check the latest certifications.
Making Your Choice
Your decision should ultimately come down to your specific fitness goals and dietary needs. If your main objective is to maximize raw caloric intake and get a performance boost from a higher dose of creatine, Serious Mass is a strong, budget-friendly option. It is ideal for classic 'hardgainers' who struggle to put on weight. If you are a competitive athlete who prioritizes banned substance testing and wants a more comprehensive recovery blend with added glutamine and BCAAs, Pro Bulk is a more specialized choice, even with its lower creatine content. The marginal difference in total calories is less important than the nuanced differences in added ingredients and assurance.
Ultimately, no supplement can replace the benefits of a balanced diet and consistent training. But with the right product, you can significantly enhance your progress and get closer to your fitness goals.
Pros of Serious Mass:
- Higher dose of creatine monohydrate per serving.
- Provides a wider range of vitamins and minerals.
- Well-established and reliable brand.
Cons of Serious Mass:
- Relies heavily on simple carbohydrates (maltodextrin), which can lead to quick insulin spikes.
Pros of GNC Pro Performance Bulk 1340:
- Slightly higher total calories per serving.
- Certified banned substance tested for competitive athletes.
- Includes BCAAs and a higher dose of glutamine for recovery.
- More complex protein blend from multiple sources.
Cons of GNC Pro Performance Bulk 1340:
- Lower creatine content per serving.
In summary, both are effective mass gainers for increasing caloric intake. Serious Mass excels with a higher creatine dose and micronutrient fortification, making it a great all-around gainer. Pro Bulk, with its banned substance testing and robust amino acid profile, is better suited for the discerning athlete focused on performance and recovery.
Conclusion
Understanding the specific differences between Serious Mass and Pro Bulk is crucial for making an informed decision about your supplementation. Both are high-calorie, high-carbohydrate formulas designed for weight gain, but their added ingredients and quality assurances set them apart. Your personal goals, budget, and sensitivity to ingredients will determine which is the better fit. Choose Serious Mass for a high-creatine, vitamin-rich formula perfect for hardgainers, or opt for Pro Bulk if banned substance testing and enhanced recovery ingredients like glutamine are more important for your athletic pursuits.
