Do You Need a Mass Gainer? The Honest Answer

By DanielUpdated 23 Oct 2026

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30 years in strength training & bodybuilding4 min read

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Mass gainers combine substantial calorie quantities with protein in a powder. This guide compares labelled servings, cost and homemade alternatives.

That doesn’t mean nobody should ever use one. The cases where a mass gainer is used are covered below. But for most lifters asking this question, the answer is “eat more, and let your existing whey and creatine do their job.”

What’s actually in a mass gainer

A typical mass gainer serving delivers somewhere in the range of 600-1,200 calories, largely from maltodextrin and other fast-digesting carbohydrates, with 40-60g of protein and a smaller amount of fat. Compare that with a plain whey shake, which typically runs closer to 100-130 calories for 20-25g of protein with no added sugar. A mass gainer’s job is almost entirely to add calories in a drinkable format — the protein content is a secondary feature, and often not dramatically more per serving than a normal scoop of whey once you account for the price difference.

The EU-authorised protein wording is shown below.

Do you actually have a calorie problem?

Before reaching for any gainer, the honest question is simpler: are you actually eating enough? Most people who feel they “can’t gain weight” are underestimating how much food a genuine calorie surplus requires, not suffering from some unusual metabolism. Gaining muscle needs a modest, consistent calorie surplus on top of adequate protein and progressive training — see our guide on supplements for muscle gain for the training and nutrition basics that actually move the needle. Tracking your intake honestly for even a week usually reveals the gap.

Why real food + whey + creatine usually beats a mass gainer

Once you know you need more calories, the cheapest and most nutritious way to get them is rarely a branded tub. A few reasons:

Cost per calorie. Oats, rice, potatoes, bananas, peanut butter and whole milk are almost always cheaper per calorie than a mass gainer, and they bring fibre, vitamins and minerals a sugar-heavy blend doesn’t.
Nutrient density. Mass gainers lean on refined carbohydrate for their calories. Real food calories come with the micronutrients your body needs anyway, whether or not you’re bulking.
You control the protein. A scoop of Whey protein blended with milk, oats and a banana gets you into mass-gainer calorie territory with a cleaner ingredient list and a complete protein profile, for less money.
Creatine has an authorised EU claim. The exact wording is shown in the box below; a mass gainer’s extra sugar doesn’t carry one. Creatine monohydrate costs a few cents a day.

A simple DIY “gainer” shake

If you want a big, calorie-dense shake without the added sugar, you can make your own: a scoop of whey, a cup of oats blended in, a tablespoon of peanut butter, a banana and whole milk gets you into the 700-900 calorie range with a genuinely complete nutrition profile — protein, fibre, healthy fats and micronutrients a tub of maltodextrin doesn’t offer. It typically costs less per serving than a commercial gainer, and you know exactly what’s in it.

When a mass gainer is a reasonable convenience

There are cases where the honest answer shifts. If you have a genuinely high calorie need — a physically demanding job on top of hard training, a fast metabolism, or an appetite that makes eating enough solid food a real struggle — a calorie-dense drink is one way to add calories when food alone isn’t landing. In that situation, a mass gainer (or the DIY version above) is an option. The distinction is: use it because eating enough is genuinely hard, not because you believe the tub itself builds more muscle than the calories and protein you’d get elsewhere.

The honest verdict

So, do you need a mass gainer? For most people building muscle, no — the calories are expensive relative to real food, the ingredient list leans heavily on sugar, and the protein and performance benefits you actually need are already covered by whey and creatine monohydrate. Eat more real food, hit your protein target, and be patient. If eating enough is a genuine daily struggle, a calorie-dense shake — homemade or bought — is a reasonable tool, not a shortcut to faster gains.

Source: European Commission, EU Register of nutrition and health claims made on foods (authorised claims for protein and creatine) — ec.europa.eu/food/food-feed-portal/screen/health-claims/eu-register

Frequently asked questions

Is a mass gainer just sugar?

Not entirely, but it's close. A typical mass gainer is mostly fast-digesting carbohydrate (often maltodextrin) with a moderate amount of protein — usually 600-1,200 calories and 40-60g of protein per serving. The bulk of what you're paying for is calories, not a special muscle-building ingredient.

Can I build muscle without a mass gainer?

Yes. Muscle gain requires a calorie surplus, adequate protein, and progressive training — none of which requires a dedicated mass-gainer product. Real food plus a whey protein shake and daily creatine covers the same needs, usually more cheaply and with better nutrition.

What should I use instead of a mass gainer?

Extra real food (oats, rice, potatoes, bananas, peanut butter, whole milk) to cover your calorie surplus, a whey protein shake to hit your daily protein target, and creatine monohydrate daily (the exact EU-authorised wording and the daily amount it requires are in the box on this page). A homemade shake with whey, oats, peanut butter and milk gives a similar calorie hit with a cleaner ingredient list.

Who actually benefits from a mass gainer?

People with a genuinely high calorie need who struggle to eat enough solid food — for example, a demanding job combined with hard training, a very fast metabolism, or a small appetite. In those cases, a calorie-dense shake (homemade or a commercial mass gainer) is an option, not a requirement for building muscle.

Mass gainers: comparing convenience and cost