Top 5 Mass Gainers in NZ

Looking to add serious size and strength? Mass gainers can help by providing a rich blend of protein, carbs, and calories to fuel your workouts and promote muscle growth. Whether you're a hard gainer or simply need an extra boost, we've rounded up the top 5 mass gainers available in NZ to help you reach your goals faster.

For a full breakdown of what to look for in a mass gainer, check out our Ultimate Guide to Mass Gainers here.


1. Optimum Nutrition Serious Mass

Optimum Nutrition’s Serious Mass has earned its reputation as one of the top mass gainers worldwide, and for good reason.

  • Calories: 1,250 per serving
  • Protein: 50g per serving
  • Carbs: 252g per serving
  • Features: Packed with over 25 vitamins and minerals, Serious Mass is a calorie-dense formula ideal for those aiming to increase both muscle and overall body size.
  • Why We Love It: With a high-carb content and added creatine and glutamine, this mass gainer is designed for serious bulking. It’s also available in multiple flavours, making it a versatile option for any taste preference.

Best For: Hard gainers and those with high calorie requirements who want a reliable product to support rapid muscle gain.

Shop Optimum Nutrition Serious Mass here.


2. Mutant Mass Extreme 2500

If you're after extreme gains, Mutant Mass Extreme 2500 offers a massive calorie load to support intense training and serious mass-building goals.

  • Calories: 1,270 per serving (up to 2,540 when mixed with milk)
  • Protein: 52g per serving
  • Carbs: 255g per serving
  • Features: Formulated with a unique blend of protein and carb sources, including complex carbs and whey protein isolate, Mutant Mass Extreme is a powerful choice for athletes looking to go big.
  • Why We Love It: This mass gainer goes all in with its calorie count and protein blend, making it ideal for those wanting to gain weight quickly. Plus, the high-quality carb sources make it a solid option for maintaining energy during extended training sessions.

Best For: Athletes with high metabolic rates or intense training schedules who need the extra calories to meet their bulking goals.

Shop Mutant Mass Extreme 2500 here.


3. Musashi Bulk Extreme

From a trusted NZ brand, Musashi Bulk Extreme provides a balanced ratio of protein, carbs, and fats to support muscle mass gains while keeping it relatively lean.

  • Calories: 920 per serving
  • Protein: 32g per serving
  • Carbs: 40g per serving
  • Features: This formula includes medium-chain triglycerides (MCTs) to support energy, plus added amino acids for improved recovery and muscle repair.
  • Why We Love It: Musashi Bulk Extreme is a great choice for those who want to add size without overdoing the calories. Its mix of MCTs and amino acids also supports recovery and energy, making it ideal for athletes focused on both performance and gains.

Best For: Individuals looking to bulk up without adding excessive fat, thanks to a more balanced calorie-to-protein ratio.

Shop Musashi Bulk Extreme here.


4. MuscleTech Mass Tech Elite

Muscletech Mass-Tech is designed for lean mass gain, with a formula packed with high-quality protein and essential amino acids.

  • Calories: 840 per serving
  • Protein: 63g per serving
  • Carbs: 132g per serving
  • Features: With a unique multi-phase protein blend and a mix of complex and simple carbs, Mass-Tech delivers fast and slow-digesting nutrients to support prolonged muscle building.
  • Why We Love It: Mass-Tech is designed for building lean muscle mass without adding unnecessary fat. It’s perfect for athletes who want to stay lean but still gain size, and it also includes a solid dose of BCAAs to boost muscle recovery.

Best For: Those focused on building lean muscle with minimal fat gain, as well as those who need extra support in recovery.

Shop Muscletech Mass-Tech Performance Series here.


5. Balance Massive

A reliable New Zealand favourite, Balance Massive offers a straightforward yet effective formula for muscle gain and post-workout recovery.

  • Calories: 448 per serving
  • Protein: 25g per serving
  • Carbs: 78g per serving
  • Features: With a lower calorie count, Balance Massive is a more flexible option that can be adjusted to suit various calorie and protein goals. The formula includes essential vitamins and minerals, plus creatine to support muscle performance.
  • Why We Love It: Balance Massive is versatile and can be tailored to suit different training demands. It’s also a good choice for those who are just starting out with mass gainers and want to try a moderate calorie increase.

Best For: Beginners or those looking for a more controlled approach to bulking who can add servings as needed.

Shop Balance Massive here.


Conclusion: Which Mass Gainer is Right for You?

Each of these mass gainers offers unique benefits depending on your goals, whether you’re looking to gain muscle quickly, stay lean while adding size, or supplement an intense training routine.

Need more guidance?

Check out our Ultimate Guide to Mass Gainers here for more tips on choosing the right product for your goals, or browse our full selection of mass gainers here to start your muscle-building journey today.

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