Illustration of a mass gainer supplement for skinny guys.

Should Skinny Guys Use Mass Gainers?

Mass gainers, also known as weight gainers, are popular with skinny guys trying to bulk up. They’re especially popular with “hardgainers” whose metabolisms make it difficult to gain weight. I’m a naturally skinny guy myself, and I’ve always found it nearly impossible to get into a sustainable calorie surplus.

I’ve experimented with my fair share of mass gainers. I’ve tried all the popular brands, I’ve made my own homemade shakes from whey protein and maltodextrin, and I’ve tried all sorts of thousand-calorie bulking shakes. That’s how I gained my first 50 pounds.

So, do mass gainers work? Are they healthy? Do they cause excess fat gain? And, if you’re a skinny guy struggling to gain weight, should you use them?

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Illustration of a skinny guy holding a tub of protein powder while bulking.

The Best Protein Powder for Bulking (2024)

I’ll tell you the best protein powder for bulking, but you might be asking the wrong question. Protein is an important part of a balanced bulking diet, and protein powder is an easy way to get that protein, but you might be thinking of a weight gainer.

Weight gainers are high-calorie bulking supplements that contain both protein and carbs. You mix it into water just like protein powder, but you can get around 10x as many calories per serving. That can make it easier to gain weight. That might be what you’re thinking of. We’ll cover the best weight gainers, too.

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Illustration of a skinny guy worried that he's having too much whey protein powder.

How Much Protein Powder Can You Have Per Day?

One of the most common questions we get is how much protein powder is too much protein powder? One scoop of whey per day is probably fine, right? But what about 2 scoops? 3 scoops? 4?

I’ve seen dozens of muscle-building studies where the researchers give participants upwards of 60 or even 90 grams of protein per day for several months in a row, measuring what effects it has on muscle growth.

There are other studies looking directly at how much protein powder you can safely have per day.

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Illustration of a skinny guy drinking a protein shake to build muscle and bulk up.

The Best Time to Have a Protein Shake

You can have a protein shake at any time. The most important thing is to consume enough protein overall. Still, some times are better than others.

Maybe you’ve heard of a bodybuilder who wakes up in the middle of the night to chug the shake they’ve left on their bedside table. You can do better than that.

And what about the anabolic window? Should you be having protein shakes before and after working out? Maybe, yes.

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Before and after illustration of a skinny guy using creatine to build muscle and gain weight.

Before & After Creatine: How Much Extra Muscle Will You Gain?

Creatine has earned a reputation for being the most powerful muscle-building supplement, and with good reason. It has thousands of studies proving its effectiveness. Still, most people don’t know how much extra muscle it will actually help them build. 5% more? 50% more?

One way to get an idea of how well it works is to look at before-and-after photos of guys combining weight training, a good bulking diet, and creatine supplementation. But that won’t tell you exactly how effective creatine is. That’s why we need to look at the research.

There are two big meta-analyses looking at how creatine affects muscle growth. The first tells us how much extra lean mass we can expect to gain. The second tells us how much extra muscle mass we can expect.

We don’t sell supplements. There are no affiliate links in this article.

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Illustration of a skinny guy taking creatine to gain weight and build muscle.

Should Skinny Guys Take Creatine to Build Muscle?

Once upon a time, I was 23 years old and 130 pounds at 6 feet tall. I was skinny and underweight, with a BMI of just under 18. I was hunchbacked from all my time spent hunched over my desk studying graphic design.

My roommate, Shane, was similarly thin, so we made a pact to bulk up together. We called it Muscle May and spent much of April preparing for it. But even before I started lifting weights or eating more food, my body was already transforming.

In preparation for the start of Muscle May, I started taking creatine monohydrate a week early. I wanted to load up on creatine beforehand so that my levels were optimized for my first workout. I mixed 5 grams of creatine into a glass of blueberry juice. The creatine was grainy but tasteless. It was the first muscle-building supplement I ever took.

By the end of the week, before I started lifting weights or eating a bulking diet, I had gained 8 pounds from creatine alone. I couldn’t believe it.

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Illustration of a skinny lifter using collagen to build muscle.

Does Collagen Help Build Muscle? A Quick Research Overview

Collagen is a popular “anti-aging” supplement for maintaining skin elasticity, keeping our joints strong, and helping our connective tissues recover. So far, the research has shown that collagen does indeed offer all of those benefits, in a small way—probably (study, study).

Lifters often run into nagging aches and pains in their joints and tendons. Supplementing with collagen seems like a reasonable way to improve recovery. That raises an obvious question: what about muscle growth? Does collagen help build muscle?

Jacinto and colleagues tried to answer that question by comparing whey protein against collagen protein, then seeing which yielded more muscle growth. It’s a neat study. Let’s delve into it.

Delve Deeper
Illustration of a tub of weight gainer powder.

The Best Bulking Supplements for Skinny Guys

Over 5,000 shares and 500 comments later, here’s our revised supplement guide for skinny guys trying to build muscle in time for last summer. We’ll cover supplements that speed up muscle growth, such as creatine. We’ll review supplements that help skinny guys bulk up, like mass gainers. We’ll talk about pre-workout supplements, too.

When talking about supplements, we use research, personal experience, and over a decade of full-time coaching experience. We’ve each gained seventy pounds (naturally). We’ve also helped over 10,000 skinny guys bulk up with our Bony to Beastly Bulking Program. Marco has a degree in Health Sciences, and he’s trained hundreds of clients, ranging from everyday desk workers all the way up to college, professional, and Olympic athletes.

We don’t sell supplements. There are no affiliate links.

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Illustration of a bodybuilder using turkesterone to build muscle.

Does Turkesterone Work? (Explaining the Scam)

Is turkesterone a good supplement for building muscle? It’s been promoted everywhere lately—Joe Rogan, More Plates More Dates, Greg Doucette, and Vitruvian Physique have all discussed its benefits. The idea is that it can boost testosterone production, allowing us to build muscle faster and more leanly. But is there any good evidence to back those claims up? And if so, what kinds of results can you expect?

Our specialty is helping skinny guys bulk up. Cutting-edge supplements are a bit outside of our wheelhouse. That’s why we spoke with Eric Trexler, Ph.D. He’s got a doctorate degree in sports science, has published over 30 strength and hypertrophy studies, and professionally reviews research for Monthly Applications in Strength Sport (MASS). This is exactly his area of expertise. We also have a few studies to review. And then there’s the official position of the International Society of Sports Nutrition (ISSN).

So, does turkesterone live up to the hype? Can it help you build muscle?

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Are Pre-Workout Supplements Good for Building Muscle?

We’ve seen some heated discussions about ingredients and dosages founds in pre-workout supplements. Does this particular brand have at least six grams of citrulline malate? Is it the correct ratio of citrulline to malate? Is there theanine alongside the caffeine to blunt the jitters? Are they using proprietary blends to hide subpar dosing? Unless you’re super into supplement research, it can be hard to parse.

But the more important question is, will taking a pre-workout supplement actually help you build muscle? Instead of diving right into min-maxing the ingredients and dosages, maybe we should take a step back and see if pre-workout supplements even work.

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