How to Choose a Weight Gainer for Bulking

By optimumnutrition | Published: 2026-10-24

Category: Buying Guides

Learn how to pick a weight gainer that fits your calorie needs, taste, and budget. We break down the key factors and show why Serious Mass stands out.

Quick answer

For most people looking to bulk up, a weight gainer like Optimum Nutrition Serious Mass is a solid choice because it packs a high calorie punch with added creatine and immune support. But the right pick depends on your calorie needs, taste preferences, and digestive tolerance.

Calorie content: the core of a weight gainer

Weight gainers are designed to help you hit a calorie surplus without eating a massive volume of food. Serious Mass delivers a dense calorie load per serving, which makes it easier to add extra energy to your diet.

But that also means you need to be mindful of portion sizes. If you're not used to high calorie shakes, start with a half serving and gradually increase to avoid feeling overly full or bloated.

Protein and carbs: the building blocks

A good weight gainer should offer a balanced mix of protein and carbohydrates to support muscle repair and replenish glycogen stores. Serious Mass provides a substantial amount of protein per serving, which helps with muscle recovery after workouts.

The carbohydrate content is equally important for fueling your training and boosting your total calorie intake. Look for a product that lists the carb source clearly so you know what you're consuming.

Taste and mixability: don't underestimate them

If a shake tastes bad, you won't stick with it. Serious Mass comes in Chocolate Peanut Butter, a flavor that many find enjoyable and easy to drink daily.

Mixability matters too. A powder that clumps or leaves residue is annoying. Serious Mass tends to blend smoothly with a shaker or blender, making it convenient for post-workout or on-the-go.

Decision rules for choosing a weight gainer

Calorie target: Estimate your daily calorie surplus needed for bulking (usually 300-500 calories above maintenance). Choose a weight gainer that provides at least that many calories per serving, or plan to adjust portion sizes. Check the serving size and calories per serving on the label.
Protein content: Aim for a weight gainer with at least 20-30 grams of protein per serving to support muscle repair. Serious Mass provides a substantial protein amount, but always verify the exact number. Compare protein per serving across brands.
Carbohydrate source: Look for a carb source that fits your digestive tolerance. Some gainers use maltodextrin or oats; if you have a sensitive stomach, start with a smaller serving and see how you feel. Start with half a serving to test tolerance.
Added ingredients: Consider extras like creatine, vitamins, and minerals. Serious Mass includes creatine for strength and performance, plus Vitamin C and Zinc for immune support, which can be beneficial during heavy training. Decide if you want a multi-functional gainer or a simple one.
Taste and mixability: Choose a flavor you enjoy and check reviews for mixability. Serious Mass in Chocolate Peanut Butter is a popular choice, but you can also look for sample packs to try before committing. Read user reviews for taste and texture.

Product spotlight

Optimum Nutrition Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Chocolate Peanut Butter, 6 Pound (Packaging May Vary): Serious Mass is a weight gainer protein powder with creatine for strength and performance, plus Vitamin C and Zinc for immune support. Creatine can help you push harder in the gym, and immune support is useful when you're eating at a surplus and training heavy.
Optimum Nutrition Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Chocolate Peanut Butter, 6 Pound (Packaging May Vary)
Optimum Nutrition Serious Mass, Weight Gainer Protein Powder, Mass Gainer, Vitamin C and Zinc for Immune Support, Creatine, Chocolate Peanut Butter, 6 Pound (Packaging May Vary): The Chocolate Peanut Butter flavor is designed to provide a rich taste to help increase calorie intake. A flavor you enjoy makes it easier to consume the shake consistently, which is key for bulking.

Who should use a weight gainer?

Best for

Hard gainers who struggle to eat enough calories from whole foods alone
Athletes and lifters who need a convenient high calorie shake to hit their bulking goals

Not for

People who are trying to lose weight or maintain weight
Those with lactose intolerance or sensitive stomachs who may find high calorie shakes too heavy