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Build Muscle

Build muscle mass and gain bulk with expertly designed products to help boost your calorie and protein intake, while supporting your goal.

Gaining muscle size requires serious dedication to training, eating and all things recovery. Nutrition for muscle building can be complicated but one thing that is simple is your need for calories and protein. Discover what supplements to choose, so you can pack on the muscle and bulk you have trained so hard to gain.

Optimum Nutrition Serious Mass Weight Gainer, 2.73 kg container, chocolate flavor, supports muscle building

SERIOUS MASS

The ultimate in weight gain formula.

  • Up to 1,263-1,269  kcals per shake
  • 50 grams of Whey Protein to help build and maintain muscle
  • 3g added Creatine per serving to support performance 
  • 251-257 g of carbohydrates per serve to helps support and promote muscle recovery
  • 25 Vitamins and Minerals
SHOP SERIOUS MASS

Other recommended products:

Optimum Nutrition Gold Standard 100% Whey protein powder, 5 lb container, Double Rich Chocolate flavor

GOLD STANDARD 100% WHEY

A great way to boost your protein intake and support your muscle growth and repair. The world’s #1 best-selling whey protein powder^, providing 24 g of high-quality whey protein per serving.

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Optimum Nutrition Gold Standard Pre-Workout, fruit punch flavor, 330g container, 30 servings

GOLD STANDARD PRE-WORKOUT

Get the most out of your training with GOLD STANDARD PRE-WORKOUT™ with its unique formula designed to unleash energy, focus, power and performance to help you get through your session.

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Optimum Nutrition Micronised Creatine Powder, 634g container, 183 servings

MICRONISED CREATINE

From the World's No. 1 selling sports protein powder brand, each serving provides 3.4 g of Creatine Monohydrate to increase muscle power in successive bursts of short-term, high intensity, repeated exercise.

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How much protein do I need?

How much protein do I need?
Find out in under 60 seconds with our protein calculator.

GET YOUR DAILY PROTEIN INTAKE

REACH YOUR POTENTIAL

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Our best advice and recipes

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Debunking the Top 3 Protein Myths
Expert Advice

Debunking the Top 3 Protein Myths

Takeaway points Eating more protein does not harm healthy kidneys. Protein strengthens bones rather than weakening them. Higher protein intakes do not shorten lifespan and may support healthy...

Nutrition Strategies for Elite Swimmers During the Training Phase
Expert Advice

Nutrition Strategies for Elite Swimmers During the Training Phase

Key Takeaways Carbohydrates drive performance: Periodise intake based on training load (8–10 g/kg on heavy days). Protein supports repair: Aim for 20–30 g every 3–4 hours, plus casein before be...

Insiders: Clare Farrell and Dr. Eric Helms
Expert Advice

The Race Against Time to Recovery

Key Takeaways: Short turnarounds between games demand a strategic recovery plan, with nutrition playing a central role. Post-match nutrition must target hydration, glycogen replenishment, and muscl...