Best Weight Gainer for Skinny Guys

There are a lot of guys who are desperate to gain weight and, if you’re reading this you may well be one of them. Of course, what you’re interested in is lean muscular body mass - not fat. To do it you need to hit the weights hard. But you also need to increase your daily caloric intake, with a calculated ratio of proteins, carbohydrates and fats. Weight gain powders are an essential part of that equation.

In this article we bring you the Top 10 weight gain products on the market. In addition, we provide you with the information you need to make the best choice when it comes to purchasing and making the best use of your weight gaining powder. 

Top 10 Weight Gainers

Detailed Review of Best Weight Gainers for Skinny Guys

Optimum Nutrition Serious Mass

With a massive serving size of 334 grams, Optimum Nutrition Serious Mass delivers a bucket load of macros to your muscle cells. Each serve will fast track 50 grams of protein, and 254 grams of carbs into your bloodstream. The main carb source is maltodextrin, a sugar with a high glycemic index that will quickly replenish your glycogen stores.

This product has a 5:1 carb to protein ratio.

Be aware that this product contains sweet dairy whey, which may cause problems for people who are lactose intolerant.

The main carbohydrate source for Serious Mass is maltodextrin. Maltodextrin is a dissacharide form of sugar, which has a very high glycemic index. This will allow it to be absorbed very quickly into your bloodstream. It is extremely beneficial for muscle recovery and glycogen replenishment. This is great for people who are trying to gain weight.

The protein blend in Serious Mass is made up of whey protein concentrate, calcium caseinate, egg albumin and sweet dairy whey. This combination of whey, casein and egg protein gives you a sustained release of protein into the bloodstream.

Serious Mass includes one gram of creatine monohydrate per serving. Also included are 500 mg of L-Glutamine, 500 mg of Glutamine Peptides,

There is also a vitamin blend in the product.


  • 50 grams protein per serve
  • 254 grams carbohydrate per serve
  • Maltodextrin


  • Contains sweet dairy whey
  • Contains lactose

BSN True Mass contains 18 servings with 630 calories. It also contains 46 grams of protein, sourced from top quality hyrdrolyzed whey protein, micellar casein, calcium caseinate, and egg whites. There are 16 grams of fat, only 5 of which are saturated fats. It also contains 76 grams of carbs, only 14 of which are sugars. 5 grams of fiber are included as a buffer to time release the carbs into your system. There are also extra enzymes to help your body break down and absorb the product.

On the downside, this product does contain 110 mg of cholesterol. The counter is that most users say that this is the best tasting mass gainer they’ve come across.


  • 630 calories per serve
  • 46 grams protein
  • 76 grams carbs
  • 5 grams fiber
  • Extra enzymes for absorption


  • 110 mg cholesterol
Optimum Nutrition Pro Gainer

Pro Gainer from Optimum Nutrition is a lean muscle mass gainer, in contrast to Serious Mass. The key difference is that this product is much lighter in carbs. It’s got 650 calories, just 8 grams of fat (4 saturated), and 85 grams of carbs. Pro Gainer contains a huge 60 grams of protein from seven different unique protein sources. This is a quality product that is loaded with BCAA’s and digestive enzymes.

There are 14 servings in a 5 pound bucket. You may decide, however, to break one large serving into two daily servings, one before and one after your workout.


  • 650 calories
  • 60 grams protein
  • 7 protein sources


  • Relatively low in carbs (85 grams)
Muscle Milk Gainer

Muscle Milk Gainer has been especially designed for hard gainers. It provides you with 650 calories and 32 grams of protein. There are also 3 grams of leucine from milk protein sources. This weight gainer also provides you with 18 amino acids, including all of the essential amino acids. You have an amazing fifty flavors to choose from with this product, including some very tempting and exotic combinations. According to most reviewers, the majority of flavors are tasty. The powder mixes well in both water and milk without leaving any grittiness or residue.

The protein used in Muscle Milk Gainer is a blend of six protein types as follows:

  • Milk protein isolate
  • Calcium sodium caseinate
  • Whey protein isolate
  • Whey protein casein
  • Whey protein concentrate
  • Whey protein hydrolysate 

Muscle Milk Gainer also includes glutamine and taurine to help provide training energy and to speed up post workout recovery. 


  • 650 calories
  • 32 gram protein
  • 3 grams leucine
  • 50 tasty flavors


  • Relatively low in carbs
Cyto Sport GainerCyto Sport Gainer

Cyto Sport are the people behind the hugely popular Monster Milk. Their Cyto Sport Gainer comes in a 6 pound container which delivers 50 grams of protein, with 4 grams of l-leucine added per serve. You get a whopping 600 calories with each serve. There are, however, just 73 grams of carbs, which gives you a 1.15:1 carb to protein ratio. The protein mix is a combination of fast and slow digesting varieties to give you a protein release that lasts for hours. 


  • 50 grams protein
  • 4 grams l-leucine
  • 600 calories per serve
  • Whey / Casein protein blend


  • Relatively low in carbs
Naked Mass

In keeping with their stripped back mission, Naked Nutrition have put just three ingredients into Naked Mass; Maltodextrin, Whey Protein and Micellar Casein. There are absolutely no additives or fillers in this product. Instead, you get 1252 calories, 252 grams of carbs and 50 grams of protein per serve (includes 11.5 grams of BCAA’s). It’s gluten free, soy free and dairy free.
Naked Mass provides you with an easy to digest form of quality protein in the form of both fast acting whey and slow digesting casein. This provides your body with an instant surge of amino acids to re-feed your muscle cells after a workout as well as a constant source of slow release aminos for overnight muscle repair.

With 11 grams of branch chain amino acids, Naked Mass also provides the vital essential proteins that you need to maintain an anabolic muscle building state.

As it contains no soy, wheat, milk and eggs, Naked Mass is the smart choice for people who have, or suspect that they may have, allergies to these foods. It is also great for people who simply want a clean source of protein that will give them pure muscle weight gain.


  • 50 grams of protein
  • Organic maltodextrin
  • 11 grams BCAA’s
  • No artificial sweeteners, flavoring or colors


  • Expensive
  • Very large serving size
Real Gains by Universal Nutrition

Universal Nutrition Real Gains comes in your choice of three sizes - 3.8 pounds, 6.65 pounds and 10.6 pounds. The 10.6 pound bag provides you with 31 servings, each of which serving measure 155 grams. A serving consists of three and a half scoops of the powder. With every serving you get 53 grams of protein powder. The protein is sourced from micellar casein, ultra filtered whey protein concentrate and isolate. You also get 86 grams of carbohydrate and 5 grams of fiber in every serving.

Universal Nutrition Real Gains comes in three flavors - chocolate, strawberry and vanilla. Reviewers tend to prefer the chocolate flavor, which provides a pleasant taste. However the powder has a tendency to clog up when it is mixed. This is because micellar protein is harder to mix. It does have very good digestibility. You will not experience, bloating or indigestion, constipation or diahhrea when you take this product. 


  • 53 grams protein
  • 5 grams fiber
  • High in calories


  • Relatively low in carbs (86 grams)
  • Only three flavors
Mutant Mass

Each serving of Mutant Mass provides a massive 1060 calories. That’s about as many calories as you’d consume from a full roast dinner - all in one shake! The carb to protein ratio of Mutant Muscle is ideal for muscle gain. You get 182 grams of clean carbs and 52 grams of protein with every serve.

To gain muscle weight you need to be in a calorie surplus. Mutant Mass will get you there fast. You not only get a lot of calories with this product, but you get quality, muscle enhancing calories. With 52 grams of protein you will not have to use a separate protein powder.

The carbs you get with Mutant Mass are clean carbs. That means that they are complex sources of energy, unlike may products that will provide you with a quick high, only to be followed by a crash later in the day. These carbs are sourced from waxy maize, and waxy maize maltodextrin.

Other carb sources are whole oats, soy and waxy barley starch.

This weight gainer is packed with anabolic enhancing compounds that will literally guarantee that you will build muscle. A lot of weight gainers just don’t taste good. This isn’t one of them. In fact, the taste of Mutant Mass is one of its strong points. It comes in a range of delicious flavors, mixes well and is easy to digest.


  • Delivers a LOT of calories per serve
  • Tastes great
  • Value for money
  • 52 grams of protein
  • BCAAs
  • Glutamine


  • Can lead to gas and bloating
  • Difficult to drink a whole serving
  • 38 grams of sugar
  • Best mixed with a blender
  • Contains gluten
MuscleTech Mass Tech

MuscleTech Mass Tech is a supercharged weight gainer that provides you with a whopping 1170 calories and 80 grams of protein in every serve. You also get 154 grams of carbs and 17 grams of BCAAs with every dose. Unlike with many weight gainers, Mass Tech also provides you with 10 grams of creatine with every serve to allow you to maximise your strength potential while training. The multi-phase complex carb matrix delivers a powerful blend of Glucose Polymers, Isomaltulose, Oat Bran, Amaranth, Quinoa, Buckwheat, Millet,and Chia to give you a long lasting energy source.

Each tub of MuscleTech Mass Tech provides you with 7 pounds of weight gain powder. You also get 3 grams of L-Alanine, along with 3 grams of Glycine, along with taurine and glutamine. In addition, you get a healthy dose of omega-rich fats. This product is available in 3 flavors - strawberry, vanilla and chocolate. 


  • 1170 calories
  • 80 grams protein
  • 17 grams bcaa’s
  • 10 grams creatine


  • Expensive
Dymatize Super Gainer

Dymatize Super Gainer is one of the most calorie dense weight gainers on the market. It delivers huge 1280 calories, with 50 grams of high quality protein and 1 gram of creatine. You also get an amino acid blend along with a powerful vitamin and mineral blend in each serving. You also get 10 grams of fat and 244 grams of carbohydrates and 23 grams of sugar. The protein blend is a mixture of five types including whey protein concentrate, milk protein isolate, whey protein isolate, whey protein hydrolysate and micellar casein.

Super Gainer does not mix very well when mixed in a shaker bottle. Unless you want a clumpy result you will want to mix your weight gainer in a blender. The product comes in a variety of sizes and is available in seven flavors, all of which are quite tasty. It is also a gluten free product which makes it ideal for people who are suffering from celiac disease. However it does contain lactose, so is not a good fit for those who have a lactose intolerance. 


  • 1280 calories per serve
  • 50 grams of protein
  • 50 grams of protein
  • 244 grams of carbs


  • ​10 grams of fat
  • 23 grams of sugar
  • Does not mix very well

Why Use a Weight Gainer?

The purpose of a weight gainer is to promote muscle growth. They do this by promoting muscle recovery after exercise so that the muscle can grow back stronger and bigger than it was before the stress (exercise) was placed upon it. If you take a mass gainer without working out, there is a strong chance that you will gain nothing but body fat.

How to Use a Weight Gainer?

How to Use a Weight Gainer

A weight gain powder is designed to be used to boost your daily caloric intake. As such it should not be taken as a meal replacement but, rather, as a supplement to your existing meals. Take your weight gainer, mixed with either water or milk, once per day at least an hour separated from any of your whole food meals. You should also ensure that there is about a 90 minute gap between taking your weight gainer and heading off to the gym. This will ensure that you don’t experience any bloating while you are working out. 

When to take a Weight Gainer?

If you are in a bulking phase, you should definitely use a weight gainer. When you’re bulking you know that you’ll put on a bit of fat with the mass.

When to take a Weight Gainer

Take your weight gainer along with your meals. This is a supplement to your normal eating regime. You probably have 5 to 6 other meals to eat throughout the day. Don’t replace them with a weight gainer. Rather, take a weight gainer in addition to them. Whole foods must always form the back-bone of your nutritional plan.

Take just one serving of a weight gainer per day. Make sure that the rest of your meals are providing the macronutrients (protein, carbs, fat) that you need. You need all of them to gain mass.

How a weight gainer works?

A weight gainer is a powdered supplement designed to add mass to your body. Whereas a protein powder is primarily protein (usually at a minimum of 70%), mass gainers contain more carbohydrates and fats. They are designed for ectomorphs and hard gainers who have a seriously hard time putting on weight and, therefore, need an injection of extra calories into their daily nutritional plan.

A weight gainer will specialize in the 3 macronutrients, protein, carbohydrate and fat. Each serving will feature all three in large quantities. In contrast, a regular protein powder will specialize in just protein. It will be low in carb, fats and overall calories.

Side Effects of Weight Gainer?

Side Effects of Weight Gainer

Many people experience some degree of stomach bloating when taking a weight gainer. This is generally noticeable but not uncomfortable. You should wait 90 minutes after taking your weight gainer before working out.

When taking a weight gainer, you are getting a lot of carbohydrates in your system. This could result in fat gain so you need to be careful about the exact nature of your weight increase - if you are finding yourself putting on body-fat, then you should swap your high carb weight gainer with a low carb protein powder.

What to look for in a Weight Gainer

Not all weight gainers are created equal. If you want your weight gainer to help you to pack on pure lean muscle mass rather than ugly fat, then you need to ensure that you’re getting the right one. Here’s what you look out for .


A typical weight gainer will contain 60% carbs. Carbohydrates of course, are either complex or simple. Simple carbs are made up primarily of sugars, while complex carbs comprise of polysaccharides and oligosaccharides. You want your weight gainer to be weighted in favor of complex carbs. Simple carbs will help to provide training energy but are also potentially likely to increase your body’s fat storage.


Protein for weight gain

You should expect to find about 30 grams of protein in your weight gainer. That protein ideally should be made up of whey protein isolate, which has the lactose and fat removed.

Other Considerations

Your weight gainer product should also contain generous amounts of fiber, vitamins and essential fats.

How a Weight Gainer is Different from Whey Protein?

A weight gainer is designed to increase your muscular bodyweight. It’s key difference with a protein powder is that it is more balanced with regard to its macronutrient make-up. Weight gain powders will usually have a 2 to 1 ratio of carbohydrates in comparison to protein. A typical serving will provide you with 60 grams of carbs and 30 grams of protein. Protein powders, on the other hand, will provide you with between 20 and 30 grams of protein but only trace amounts of carbs and fats. The carbohydrates in weight gainers will come from sugars such as maltodextrin and glucose. 

Weight Gainer vs Protein

The other big difference between a weight gainer and a protein powder is that weight gainers contain many more calories. Whereas a typical protein powder may contain around 250 calories, your standard weight gainer can add as many as one thousand calories to your daily intake.


A high quality weight gain product will makes all the difference in helping you to pack solid, fat free, muscle tissue onto your frame. Our favorite weight gain product is Optimum Nutrition Serious Mass, which provides you with 50 grams protein per serve, 254 grams carbohydrate per serve made up of maltodextrin and a protein blend that is made up of whey protein concentrate, calcium caseinate, egg albumin and sweet dairy whey to provide you with a sustained release of protein into the bloodstream. Our next best offering is BSN True Mass, with its 630 calories per serve, 46 grams protein, 76 grams carbs, 5 grams fiber and extra enzymes for absorption. Rounding out our top 3 weight gainer powders is Pro Gainer from Optimum Nutrition, that delivers 650 calories, 60 grams protein and 7 protein sources.

Optimum Nutrition Serious Mass

Our #1. Recommendation

Optimum Nutrition Serious Mass

jim roose

My name is Jim Roose. I'm a former competitive power lifter and gym owner. I've bought millions of dollars of fitness equipment over the last 20 years. This site is my way of giving back to the fitness community that's done so much for me. Every article on here is carefully researched and written by me. Leave a comment if you have any questions.