Optimum Nutrition Serious Mass Weight Gainer, 3kg (Chocolate)

Optimum Nutrition Serious Mass is built for one goal: helping genuine hardgainers add real size. Each serving delivers a massive 1,250 calories and 50g of protein, designed to be taken between meals — not as a meal replacement — to push you into the calorie surplus your body needs to grow.

Backed by ON's decades of sports nutrition credibility, Serious Mass has long been a go-to for skinny lifters who've struggled to gain weight through food alone, no matter how much they eat.

Key Benefits:

• 1,250 calories & 50g protein per serving
• Designed specifically for hardgainers
• Supports muscle recovery during bulking
• Rich Chocolate flavour, 3kg pack

Mix 2 scoops with milk or water, ideally between meals, 1-2 times daily.