Weight Gainers
Whether you’re trying to increase strength and size, or struggling to gain weight, the most important thing is creating a calorie surplus — taking on more calories than you burn. We know this can be difficult when you’re leading an active lifestyle, so having one of our range of weight-gain shakes on hand makes it easier to get the fuel you need, wherever you are. For the ultimate, premium weight-gainer don't miss our bestselling THE Gainer™, or if you're not sure where to start be sure to take a look at our best mass gainers. Check out our full range of weight gainers below.
Shop Weight Gainers at Myprotein
Mass gainers are high-calorie supplements designed to make it easier to hit ambitious calorie and protein targets when whole food alone isn't cutting it. Each serving delivers a concentrated blend of protein and carbohydrates in a format that's quick to prepare and easy to consume — no meal prep required. Whether you're training hard and struggling to eat enough, or simply looking for a convenient way to add serious calories to your day, mass gainers do the heavy lifting.
The range here covers everything from straightforward weight gainer shakes to options built around complex carb sources like cream of rice. With formats suited to different goals and appetites, there's a mass gainer supplement for every type of hard gainer — from those just getting started to experienced lifters chasing serious size.
Who Weight Gainers Are For
Mass gainers are built for people who find it genuinely difficult to consume enough calories through food alone. If you're naturally lean, have a fast metabolism, or lead a physically demanding lifestyle that burns through energy quickly, hitting a caloric surplus through meals alone can feel like a full-time job. A weight gainer supplement bridges that gap efficiently, delivering the macros you need without requiring a sixth meal.
They're also a practical tool for anyone in a structured bulking phase — gym-goers, rugby players, cyclists, and anyone else whose training demands significant fuel. You don't need to be a competitive athlete to benefit from a mass gainer. If eating enough is the obstacle standing between you and your size goals, these are built with you in mind.
When to Use Weight Gainers
The most common time to use a mass gainer is post-training, when your body has worked through its fuel stores and you need to replenish them quickly. A shake after a session is a straightforward way to get protein and carbohydrates in when cooking a full meal isn't practical. Many people also use them between meals — mid-morning or mid-afternoon — as a calorie-dense addition to their regular eating schedule rather than a meal replacement.
Timing isn't rigid. The most important factor with a weight gainer supplement is consistency — hitting your daily calorie and protein targets across the whole day matters far more than the precise moment you drink your shake. Use them wherever they fit most naturally into your routine, whether that's first thing in the morning as a calorie-dense breakfast, or last thing at night to round out your intake.
Weight Gainers Benefits
High Calorie Intake Made Easy
The core job of a mass gainer is to deliver a large number of calories in a single, convenient serving. Rather than cooking multiple high-calorie meals throughout the day, one shake can add hundreds of calories to your daily total in minutes. For anyone in a bulk, this simplicity is the point.
Serious Protein Delivery
Mass gainers stack meaningful amounts of protein into every serving. Protein contributes to the growth and maintenance of muscle mass1 — and with options like Impact Whey Mass Gainer delivering 30g per shake, hitting your daily protein target becomes considerably more manageable alongside regular meals.
Carbohydrate-Rich Formulas
The carbohydrate content in weight gainers is deliberately high, providing the energy your body needs to fuel intense training sessions. Carbohydrates contribute to the recovery of normal muscle function after highly intensive physical exercise leading to muscle fatigue and the depletion of glycogen stores in skeletal muscle2. Options like Origin Cream of Rice use complex carb sources — 39g per serving — for sustained energy alongside your training.
Flexible Formats for Different Goals
Not all mass gainers are built the same. The range here spans shakes, pancake mixes, cream of rice, peanut butter, and more — giving you different ways to increase your calorie intake beyond just a standard shake. Stack multiple products to build a high-calorie day that doesn't feel repetitive.
Popular Picks
Impact Whey Mass Gainer — A straightforward mass-building shake delivering 388 calories, 30g of protein, and 50g of carbs in every serving.
Origin Mass Gainer — For those chasing serious size, Origin Mass Gainer packs 1000 calories, 50g protein, and 180g of complex carbohydrates into a single shake.
Origin Cream of Rice — A vegan-friendly breakfast built around 39g of complex carbs per serving, Origin Cream of Rice is a simple, no-fuss way to start the day.
FAQs
What is a mass gainer?
A mass gainer is a high-calorie supplement that combines protein and carbohydrates in a single serving to make it easier to increase your total daily calorie intake. They're specifically formulated for people looking to gain size and are typically consumed as shakes, though they come in other formats too. Protein in mass gainers contributes to the growth and maintenance of muscle mass1, while the carbohydrate content helps fuel demanding training sessions.
What's the difference between a mass gainer and a protein shake?
The key difference is calorie and carbohydrate content. A standard protein shake is built around protein with minimal carbs — typically 100–150 calories per serving. A mass gainer packs in significantly more carbohydrates alongside the protein, pushing the calorie count into the hundreds per serving. Origin Mass Gainer, for example, delivers 1,000 calories and 50g of protein per shake — far beyond what a standard protein shake provides. If your goal is simply to hit protein targets, a protein shake works. If you need to increase total calorie intake substantially, a weight gainer is the tool for that job.
How many calories are in a mass gainer shake?
Calorie content varies across different mass gainer products, but options at the higher end of the range — like Origin Mass Gainer — deliver 1,000 calories per serving. Others sit in the 400–600 calorie range per shake. The right calorie level depends on how large a surplus you're aiming to create and how the shake fits into your overall daily intake.
When should I take a weight gainer?
Post-training is the most popular time — your body has used through its fuel stores and a shake delivers protein and carbohydrates quickly without the need to cook. That said, weight gainers also work well between meals or first thing in the morning as a calorie-dense start to the day. Consistency across your total daily intake matters more than precise timing, so use them wherever they fit most naturally into your routine.
Which mass gainer should I choose?
It depends on your calorie target and how you prefer to consume extra calories. If you want maximum calories in a single shake, Origin Mass Gainer delivers 1,000 calories and 50g of protein per serving — designed for serious mass-building goals. If you'd prefer a slightly lighter option with solid macros, Impact Whey Mass Gainer offers 30g of protein and 50g of carbohydrates per serving. For those who prefer a food-style option, Origin Cream of Rice is a great breakfast choice with 39g of complex carbs per serving.
Can I use a weight gainer as a meal replacement?
Mass gainers are designed to supplement your existing food intake rather than replace meals outright. They work best as additions to your regular diet — between meals, post-training, or first thing in the morning — to help you hit a calorie surplus that whole food alone isn't achieving. Using one as a substitute for a nutrient-dense meal on a regular basis means missing out on the vitamins, minerals, and fibre that whole food provides.
Are mass gainers suitable for beginners?
Mass gainers are straightforward to use and require no specialist knowledge — they're simply a high-calorie, high-protein shake. Beginners who struggle to eat enough to support their training load will find them just as useful as experienced lifters. The most important starting point is understanding roughly how many calories you need each day, so you can use a weight gainer as part of a structured daily intake rather than just adding calories with no reference point.
Who develops the weight gainers at Myprotein?
All mass gainer products are developed by Myprotein's expert nutritionists, who formulate each product to meet the specific demands of people looking to increase their calorie and protein intake. Every formula is built around clear, purposeful macronutrient ratios designed to make hitting ambitious targets more manageable.
What formats do weight gainers come in?
The weight gainers range goes well beyond a standard shake. Available formats include ready-to-mix powders in multiple flavours, cream of rice for a food-style carbohydrate source, protein pancake mix for a high-protein breakfast option, and all-natural peanut butter for calorie-dense snacking. This variety means you can increase your daily calorie intake across different meals and moments throughout the day rather than relying on a single shake.
Are mass gainers available in Ireland?
Weight gainers are available to order in Ireland across the full range, including Impact Whey Mass Gainer, Origin Mass Gainer, Origin Cream of Rice, and more. The full selection of mass gainer supplements and supporting products can be browsed and ordered online for delivery.
1. Protein contributes to the growth and maintenance of muscle mass.
2. Carbohydrates contribute to the recovery of normal muscle function (contraction) after highly intensive and/or long-lasting physical exercise leading to muscle fatigue and the depletion of glycogen stores in skeletal muscle.