Is a mass gainer better than whey protein?

They do different jobs. Whey adds protein, a gainer adds calories on top of protein. A gainer is better for someone who cannot eat enough, whey for someone who already eats enough calories and needs more protein.

Will a mass gainer build muscle?

Only with training and a sustained calorie surplus. The ISSN says diets for gaining lean mass are driven by a sustained surplus. The gainer is one way to supply it.

How many extra calories do I need to gain muscle?

A 2019 review suggests about 10 to 20 percent above maintenance, with weight gain of about 0.25 to 0.5 percent of bodyweight a week for novice and intermediate lifters. Advanced lifters should be more conservative.

Should a skinny person take a gainer or whey?

Someone who struggles to eat enough usually gains more from the calories of a gainer, while someone who eats plenty but is short of protein is better with whey. Look at your daily calories and protein before choosing.

Can I take a mass gainer every day?

It is a food, so the question is whether the calories and protein fit your plan. Count it in your day, and talk to a doctor or dietitian if you have a medical condition.

Updated 2026-10-05 · 5 min read

Mass gainer vs whey protein: which one, and do you need either?

By the UnReal Supplements team. Sources and catalog last checked: 2026-10-05.

Short answer

Whey is mostly protein. A mass gainer is a high calorie powder, protein plus a lot of carbohydrate. Gaining muscle needs a sustained calorie surplus (a review suggests about 10 to 20 percent over maintenance), so a gainer helps people who struggle to eat enough. If you already eat enough, whey is the cleaner add-on.

What is the difference between a mass gainer and whey?

Whey is a protein powder: the label shows protein as most of each scoop. A mass gainer is a high calorie powder, with protein plus a large amount of carbohydrate, designed to add a lot of calories per serving. The serving is much bigger than a whey scoop, which is why gainers are priced per serving in our table.

Neither one builds muscle by itself. Muscle comes from training, enough protein and enough total energy.

How big a calorie surplus does gaining muscle need?

The ISSN diets and body composition position stand says diets focused on gaining lean mass are driven by a sustained caloric surplus to support anabolic processes and increasing training demands. A 2019 narrative review of off-season bodybuilding nutrition by Iraki and colleagues suggests a hyper-energetic diet of about 10 to 20 percent above maintenance, aiming for weight gain of about 0.25 to 0.5 percent of bodyweight per week for novice and intermediate lifters, and a more conservative surplus for advanced lifters.

As a made up example, someone who maintains weight at 2,500 kcal a day would aim for roughly 2,750 to 3,000 kcal. That is 250 to 500 kcal more, which a gainer can supply in one or two servings, depending on its label.

When does a mass gainer make sense?

A gainer helps when you cannot eat enough solid food: a small appetite, a long working day, or a high training load. It is a convenient way to drink part of the surplus. Check the calories and protein per serving on the product page, because gainers differ a lot.

It is not needed if you already reach your surplus from food. In that case a protein powder is the cleaner top-up, because it adds protein without adding a lot of extra carbohydrate.

How much protein do you still need?

The ISSN protein position stand gives 1.4 to 2.0 g per kg of bodyweight per day as sufficient for most people who exercise, and 20 to 40 g or about 0.25 g per kg per meal. A gainer counts toward that number. Check the protein per serving in the table below, because it varies from one gainer to another.

The table below lists the mass gainers on our shelf today, by cost per serving, rebuilt from our catalog every few minutes. We deliver free within Bangkok only, and only what is on the shelf is for sale.

Mass gainers on the UnReal shelf today, cost per serving, Thai Baht
Product	Type	Pack	Price	Protein per serving	Per serving	Today
Rule 1 Mass Gainer 6 lb2 flavours	Mass gainer	6 lb	฿1,570	52 g	174.4	On the shelf
Optimum Nutrition Serious Mass 12 lb2 flavours	Mass gainer	12 lb	฿3,600	50 g	225.0	On the shelf
Optimum Nutrition Serious Mass 6 lb2 flavours	Mass gainer	6 lb	฿2,000	50 g	250.0	On the shelf

Cost per serving is the pack price divided by the servings on the label. Cost per 25 g of protein scales that by the grams of protein in one serving. Only rows where the catalog pack weight and serving count agree are shown. The price and shelf flag are read from the shop and refreshed every few minutes. 2 more product types are listed in the catalog but not on the shelf today. Browse the category.

Frequently asked

Is a mass gainer better than whey protein?: They do different jobs. Whey adds protein, a gainer adds calories on top of protein. A gainer is better for someone who cannot eat enough, whey for someone who already eats enough calories and needs more protein.
Will a mass gainer build muscle?: Only with training and a sustained calorie surplus. The ISSN says diets for gaining lean mass are driven by a sustained surplus. The gainer is one way to supply it.
How many extra calories do I need to gain muscle?: A 2019 review suggests about 10 to 20 percent above maintenance, with weight gain of about 0.25 to 0.5 percent of bodyweight a week for novice and intermediate lifters. Advanced lifters should be more conservative.
Should a skinny person take a gainer or whey?: Someone who struggles to eat enough usually gains more from the calories of a gainer, while someone who eats plenty but is short of protein is better with whey. Look at your daily calories and protein before choosing.
Can I take a mass gainer every day?: It is a food, so the question is whether the calories and protein fit your plan. Count it in your day, and talk to a doctor or dietitian if you have a medical condition.

Train with us

Nutrition coaching at UnReal Gym

Keep reading

How much protein per day Whey protein guide Best protein powder for beginners

Sources

How we keep this guide honest

We check this guide against the sources listed below. Prices, pack sizes and shelf status in the tables are read from our shop catalog and refreshed every few minutes, never typed into the text. We deliver free within Bangkok only, and only what is on the shelf is for sale.