Simply let us know, and you'll get a full refund, no questions asked. And you don't even need to return anything.
So that means you can say "yes" now and decide later.
Legion EAA Ingredients (5 grams per serving)
Essential Amino Acids (5 grams per serving)
Essential amino acids (EAAs) are a group of nine amino acids that your body can’t produce on its own. Instead, you must get them from foods like meat, fish, eggs, and dairy, or from supplements.
EAAs support muscle growth in two ways: they directly trigger muscle protein synthesis, the process of building and repairing muscle tissue, and they provide the raw materials needed to support that process.
You must consume sufficient amounts of all nine EAAs for this to occur, though. If any one is missing or too low, it can hinder muscle building. This is why BCAA supplements don’t work well for muscle growth—they contain only three EAAs, which isn’t enough to fully support the muscle-building process.[6][7][8]
Now, why supplement with EAAs rather than simply eat enough protein, which is composed of all 20 amino acids that our body needs?
The truth is simply convenience.
“Free-form” essential amino acids—which are just pure, isolated EAAs as opposed to those bound up in food—are no better (or worse) for supporting our health and body composition than the EAAs found in whole foods or protein supplements.[9]
Rather, an EAA supplement is a quick and easy way to boost your EAA intake without having to drink a protein shake or eat a snack or meal. This makes an EAA supplement perfect for when you’re rushing out the door (or the gym), traveling, or heading into a workout and don’t want food sloshing around in your belly.
Essentially, you can think of an EAA supplement as a viable, lower-calorie alternative to a protein powder, bar, or snack and use them interchangeably to support muscle growth.
That said, an EAA supplement shouldn’t be used as an outright replacement for whole-food sources of protein for two reasons:
The body needs eleven non-essential amino acids in addition to the nine EAAs to repair and grow new tissues (including muscle).
While the body can obtain non-essential amino acids from internal sources like ongoing protein breakdown and recycling, muscle building will be constrained if overall amino acid availability is too low.[10] And eating sufficient protein is the most reliable way to ensure general amino acid availability remains high.
Whole foods rich in EAAs also contain a plethora of nutrients not found in EAA supplements and are more satiating and satisfying.
So, put simply, EAAs are supplemental by nature, not fundamental like food.
With that said, research shows that supplementation with EAAs . . .
The clinically effective dose of EAAs ranges from just 3 grams, which can stimulate muscle protein synthesis, to 15-to-18 grams, which maximizes it.[25][26]
No Artificial Food Dyes, Fillers, or Other Unnecessary Junk
Artificial food dyes and fillers may not be as dangerous as some people claim, but studies show they can cause negative effects in some people, including gastrointestinal toxicity and behavioral disorders.[27][28][29][30][31]
That’s why we use natural coloring derived from fruits and other foods as well as naturally derived ingredients for enhancing shelf life and facilitating the manufacturing process.
Third-Party Lab Tested for Purity and Accuracy
Our EAA tablets are third-party lab tested for purity and accuracy and certified to meet or exceed FDA safety guidelines.[32]
Made in the USA with Globally Sourced Ingredients
If you want to ensure the supplements you’re swallowing every day are safe and effective, you want to buy from a company that:
Sources ingredients from premium suppliers around the world (great supplements require great raw materials)
Tests all products for purity and accuracy in accredited laboratories (to conclusively verify safety and efficacy)
Manufactures in America, which has some of the strictest regulations in the world
And that’s exactly what we do here at Legion.
See how Legion EAAs compare to the rest.
EAAs Per Serving
Leucine Per Serving
Third-Party Lab Tested for Purity & Accuracy
Labdoor™ Certified Brand
Price Per Serving
Price Per Gram
Legion EAA
5,000 mg
1,500 mg
Body Health Perfect Amino
5,000 mg
(proprietary blend)
A proprietary blend is a group of ingredients that lists their names but not amounts, making it impossible to know if the dosages are at clinically effective levels.
$1.50
$0.30
1st Phorm Anabolic Bridge
6,000 mg
1,116 mg
$1.57
$0.26
Pure Encapsulations Essential Aminos
725 mg
138 mg
$0.31
$0.42
The #1 brand of naturally sweetened and flavored sports supplements.
We’ve sold over 5 million bags and bottles to over 1 million customers in 169 countries who have left us over 55,000 5-star reviews.
Clinically Effective Ingredients and Doses
Every active ingredient, form, and dose in our EAAs are backed by peer-reviewed scientific research demonstrating clear benefits in healthy humans.
Total Label Transparency
We clearly list the dose of each ingredient on our EAA label—no proprietary blends or hidden ingredients—so you can verify our formulation’s validity and effectiveness.
Third-Party Lab Tested for Purity and Accuracy
Our EAAs are lab-tested for purity and accuracy and certified to meet or exceed FDA and safety guidelines.
No Unnecessary Junk
Our EAAs contain no artificial food dyes, fillers, or other unnecessary junk.
Made in the USA
Our EAAs are made in America with globally sourced ingredients in NSF-certified, FDA-inspected facilities that adhere to Current Good Manufacturing Practice (cGMP) standards.
100% Money-Back Guarantee
If you don't absolutely love our EAAs, you get a prompt and courteous refund. No forms or returns necessary.
Trusted by scientists, doctors, and everyday fitness folk alike.
Previous
"Legion is science-based at its core. Not only do they dose all of their products based on the clinical doses proven to be effective by scientific studies, they go above and beyond the their competitors by funding new research."
Dr. Bill Campbell, PhD
Professor of Exercise Science at University of South Florida
"There are a lot of sleazy supplement companies out there, but Legion is not one of them. Their products are free of fillers and inactive ingredients and they take the time (and money) to test them with independent labs to ensure you're getting what you pay for."
Dr. Spencer Nadolsky, MD
Board-Certified Family Medicine Physician and a Diplomate of the American Board of Obesity Medicine
"When it comes to quality and integrity, Legion is among the best. Their products only include ingredients that are backed by research and in doses that are proven to be effective in scientific studies."
Sal Di Stefano, Justin Andrews, and Adam Schafer
Hosts of The Mind Pump Podcast
"Legion is a tremendous company run by people I trust and respect. The quality of their supplements is second to no one. And while I don’t use many supplements, the only ones I do come from Legion."
Jordan Syatt
Strength and Nutrition Coach
"Legion consults with nutrition experts to make honest, science-based products and then proves they're genuine with independent lab work. That's how all supplement companies should operate."
Menno Henselmans, MS
Founder of Bayesian Bodybuilding, Published Scientist, and Physique Coach
"Legion's customers are getting some of the best sports supplements on the market."
"Legion Pulse is the best overall pre-workout, especially for energy and focus."
On training days, you can take 2 to 3 servings around workouts, giving you 10 to 15 grams of supplemental EAAs. On non-training days, you can take a single serving (5 grams) during the largest gap between meals to support daily EAA intake.
What are EAAs?
EAAs are essential amino acids—a group of nine amino acids your body can’t make on its own.
Specifically, they’re histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine, and they’re found in foods like meat, fish, eggs, and dairy.
Your body uses EAAs to build and repair bodily tissues, including muscle.
How are EAAs different from BCAAs?
BCAAs (branched-chain amino acids) are three amino acids: leucine, isoleucine, and valine.
EAAs include all nine essential amino acids, including the three BCAAs. That matters because your body needs all nine EAAs to build and repair muscle protein. BCAAs can help signal the process to begin, but without the other six EAAs, your body doesn’t have all the raw materials it needs to sustain it.[1][2]
If you eat plenty of high-quality protein every day, you’re probably already getting all the essential amino acids you need. In this case, taking an EAA supplement won’t offer any benefit.
That said, an EAA supplement is a quick and easy way to boost your EAA intake without having to drink a protein shake or eat a snack or meal. This makes EAAs perfect for when you’re rushing out the door (or the gym), traveling, or heading into a workout and don’t want food sloshing around in your belly.
Essentially, you can think of EAAs as a viable alternative to a protein powder, bar, or snack and use them interchangeably to support muscle growth.
Why should I take EAAs before training?
Consuming EAAs (from supplements or food) before training increases protein synthesis, which can work synergistically with resistance training to boost muscle growth.[1] Exercise also increases blood flow to your muscles, which helps ensure the EAAs circulating in your bloodstream are delivered to your muscles where they can support protein synthesis.[2]
What’s more, boosting your blood EAA levels before training keeps them elevated for 2 to 3 hours afterward, providing your body with the raw materials it needs to recover and build muscle after your workout.[3]
And if you’re like many people and don’t like training on a full stomach, an EAA supplement allows you to get all of these benefits without eating a meal, shake, or snack before your workout.
How do your EAA tablets support muscle building and recovery?
Our EAA tablets support muscle building and recovery in two ways.
First, they help trigger muscle protein synthesis and provide the amino acids needed to carry that process out. In other words, they help fire up your body’s muscle-building machinery and supply the raw materials needed to build and repair muscle tissue.[1]
Second, they can help reduce exercise-induced muscle damage, which can support recovery between workouts.[2]
Research shows that small doses of EAAs can stimulate muscle protein synthesis, but higher doses appear to have a stronger effect, with the response peaking at around 15 to 18 grams.
That’s why we recommend 10 to 15 tablets around workouts: it gives you 10 to 15 grams of EAAs, putting you at or near the maximally effective range when your muscles are most responsive to amino acids.
How much of a difference will your EAA tablets make in my training?
This depends entirely on how much high-quality protein you eat and when you consume it relative to your workouts.
If you eat plenty of high-quality protein (at least ~0.8 grams per pound or around 1.8 g/kg of body weight), spread across 3 to 4 meals per day, and generally train within about 5 to 6 hours after one of your meals (not fasted), EAA tablets won’t offer any benefits.[1][2][3]
EAAs are more helpful in the following scenarios:
You like to train fasted or with minimal food in your stomach.
You go long stretches without eating protein during the day.
You struggle to eat enough high-quality protein every day.
You’re on the go and don’t have time to eat a meal containing high-quality protein.
You’re eating out and want to order a meal that doesn’t contain much protein (like a bowl of pasta).
You can think of an EAA supplement as a viable, lower-calorie alternative to a protein powder, bar, or snack and use them interchangeably to support muscle growth.
Can your EAA tablets be taken while pregnant or breastfeeding?
If you’re pregnant, breastfeeding, or trying to become pregnant, talk to your doctor before taking our EAA tablets.
EAAs are found in protein-rich foods like meat, fish, eggs, and dairy, but free-form EAA supplements are understudied in pregnant and breastfeeding women, so we can’t confidently recommend them in these cases.
Can your EAA tablets be taken with medication?
If you’re currently taking any medication, talk to your doctor before taking our EAA tablets.
EAAs are found in protein-rich foods like meat, fish, eggs, and dairy, but free-form EAA supplements may not be appropriate for everyone depending on your health status or medication.
Are your EAA tablets gluten-free? Soy-free? Dairy-free?
Yes.
Are your EAA tablets vegetarian or vegan friendly?
Yes.
What does the Prop65 warning on the label mean?
Our products include a Proposition 65 warning in compliance with California’s regulatory guidelines, which are among the most stringent and sweeping in the world.
A Proposition 65 warning does not indicate whether a product is safe or unsafe. Rather, Proposition 65 is a consumer notification law in California that requires warnings to inform consumers about the presence of one or more of over 900 substances in various types of products. These substances include naturally occurring and ubiquitous compounds, even when present at levels below those known to cause harm.
Our EAAs contain the exact ingredients, forms, and doses used in peer-reviewed scientific research demonstrating clear benefits in healthy humans.↑
View Supplement Facts↑
That’s 263 pages of scientific research that show the ingredients and doses in our EAAs work the way we say they do.↑
The proprietary blend is little more than a sneaky way to use tiny (ineffective) amounts of lots of ingredients and hope customers don’t know any better.
Every dose listed. For every ingredient. In every product. Anything else is unacceptable.↑
Did you know that some supplements contain dangerously high levels of toxins like lead, arsenic, and cadmium?
That’s why we rigorously test every batch and guarantee our products provide exactly what the labels claim—and nothing else.
With Legion, you can be certain that what you’re putting into your body is truly safe and effective.
McCann D, Barrett A, Cooper A, et al. [published correction appears in Lancet. 2007 Nov 3;370(9598):1542]. Lancet. 2007;370(9598):1560-1567. doi:10.1016/S0140-6736(07)61306-3.↑
Gao Y, Li C, Shen J, Yin H, An X, Jin H. J Food Sci. 2011;76(6):T125-T129. doi:10.1111/j.1750-3841.2011.02267.x.↑
Did you know that some supplements contain dangerously high levels of toxins like lead, arsenic, and cadmium?
That’s why we rigorously test every ingredient for heavy metals, microbes, allergens, and other contaminants, ensuring they meet the strict purity standards set by the U.S. Food and Drug Administration (FDA).↑
Many companies use shipping and handling fees to increase their profit margins, but here at Legion, we hate profits, so our shipping is free!
Okay, so we do dig on profits, but we also go in for happy customers, and free shipping works like gangbusters. So, if it's your first order and you live in the United States, your order ships free. And if you're a returning customer, your order ships free when it's over $80.
And if you're not happy with your purchase?
Simply let us know, and you'll get a full refund, no questions asked. And you don't even need to return anything.
So that means you can say “yes” now and decide later.
Why the $199 minimum purchase amount for free shipping?
To quench our piggish lust for grubby profits in the eternal service of the dread lord Mammon?
Kind of. But not really. Because here's the truth:
Single-item orders are so blasted expensive to ship that we make very little profit on them. And no profits make the bean counters lose their marbles.
But when you order just one more item, it only costs us a few dollars more to ship both of them to you. Add a third item, and it's just a few more shekels to ship.
And that allows us to make a profit. Which keeps the bean counters happier than a hammer in a nail factory.
So, if it pleases your Grace, we humbly request your mercy and patronage notwithstanding the vexing free shipping minimum.
Why the $299 minimum purchase amount for free shipping?
To quench our piggish lust for grubby profits in the eternal service of the dread lord Mammon?
Kind of. But not really. Because here's the truth:
Single-item orders are so blasted expensive to ship that we make very little profit on them. And no profits make the bean counters lose their marbles.
But when you order just one more item, it only costs us a few dollars more to ship both of them to you. Add a third item, and it's just a few more shekels to ship.
And that allows us to make a profit. Which keeps the bean counters happier than a hammer in a nail factory.
So, if it pleases your Grace, we humbly request your mercy and patronage notwithstanding the vexing free shipping minimum.
Many supplement ingredients lack scientific validation in humans—we aren't large rodents, after all.
And even when ingredients have proven benefits, they're often used in doses too small to be effective.
That's why we exclusively use ingredients and doses shown to work in peer-reviewed scientific studies on healthy men and women.
Many supplement ingredients lack scientific validation in humans—we aren't large rodents, after all.
And even when ingredients have proven benefits, they're often used in doses too small to be effective.
That's why we exclusively use ingredients and doses shown to work in peer-reviewed scientific studies on healthy men and women.
While artificial food dyes and fillers may not be as dangerous as some people claim, studies show they can cause negative effects in some people, including gastrointestinal toxicity and behavioral disorders.
That’s why we use natural coloring derived from fruits and other foods as well as naturally derived ingredients for enhancing shelf life and facilitating the manufacturing process.
If you want to ensure the supplements you’re swallowing every day are safe and effective, you want to buy from a company that:
Sources ingredients from premium suppliers around the world (great supplements require great raw materials)
Tests all products for purity and potency in accredited third-party laboratories (to conclusively verify safety and efficacy)
Manufactures final products in America (which has some of the strictest regulations in the world)
Which is exactly what we do here at Legion.
Some supplements don't contain what their labels claim while others carry unhealthy levels of contaminants like lead, arsenic, and cadmium. And the law doesn't require brands to test for accuracy or purity or show you the results.
We do both, and we publish the proof that our products meet or exceed FDA safety guidelines.
Every batch of our supplements is tested for potency, heavy metals, microbes, allergens, and other contaminants—and passes every one.

EAA is lab-tested for purity and accuracy and certified to contain no heavy metals, microbes, allergens, or other contaminants or banned substances
While artificial sweeteners, food dyes, and fillers may not be as dangerous as some people claim, studies suggest that regular consumption of these chemicals may indeed be harmful to our health.
That’s why we use natural sweeteners like stevia, allulose, and monk fruit instead as well as natural coloring and flavoring derived from fruits and other foods.
Research shows that these ingredients are not only safe but can also confer several health benefits, such as supporting weight management, antioxidant activity, digestive health, and more.
The proprietary blend is little more than a sneaky way to use tiny (ineffective) amounts of lots of ingredients and hope customers don’t know any better.
Every dose listed. For every ingredient. In every product. Anything else is unacceptable.
While artificial food dyes and fillers may not be as dangerous as some people claim, studies show they can cause negative effects in some people, including gastrointestinal toxicity and behavioral disorders.
That’s why we use natural coloring derived from fruits and other foods as well as naturally derived ingredients for enhancing shelf life and facilitating the manufacturing process.
Many supplement ingredients lack scientific validation in humans—we aren't large rodents, after all.
And even when ingredients have proven benefits, they're often used in doses too small to be effective.
That’s why we exclusively use ingredients and doses shown to be effective in peer-reviewed scientific studies on healthy men and women.
While artificial food dyes and fillers may not be as dangerous as some people claim, studies show they can cause negative effects in some people, including gastrointestinal toxicity and behavioral disorders.
That’s why we use natural coloring derived from fruits and other foods as well as naturally derived ingredients for improving texture, enhancing shelf life, and facilitating the manufacturing process.
Not happy with your purchase?
Simply let us know, and you'll get a full refund, no questions asked. And you don't even need to return anything.
So that means you can say "yes" now and decide later.
Every active ingredient, form, and dose in This product is backed by peer-reviewed scientific research demonstrating clear benefits in healthy humans.
The ingredient, form, and dose in This product is backed by peer-reviewed scientific research demonstrating clear benefits in healthy humans.
Many supplement ingredients lack scientific validation in humans—we aren't large rodents, after all.
And even when ingredients have proven benefits, they're often used in doses too small to be effective.
That's why we exclusively use ingredients and doses shown to work in peer-reviewed scientific studies on healthy men and women.
The active ingredient, form, and dose in our creatine is backed by peer-reviewed scientific research demonstrating clear benefits in healthy humans.
Did you know that some supplements contain dangerously high levels of toxins like lead, arsenic, and cadmium?
That’s why we rigorously test every ingredient in a third-party lab for heavy metals, microbes, allergens, and other contaminants, ensuring they meet the strict purity standards set by the U.S. Food and Drug Administration (FDA).
Did you know that some supplements contain dangerously high levels of toxins like lead, arsenic, and cadmium?
That’s why we rigorously test every ingredient in a third-party lab for heavy metals, microbes, allergens, and other contaminants, ensuring they meet the strict purity standards set by the U.S. Food and Drug Administration (FDA) and World Anti Doping Agency (WADA).
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Waiver and Release of Liability
In consideration of the services and/or products offered by Legion Athletics, Inc. (“Legion”) including, but not limited to, nutrition plans, exercise routines and coaching, and in addition to the payment of any fee or charge:
I knowingly and voluntarily enter into this waiver and release of liability and hereby waive any and all rights, claims or causes of action of any kind whatsoever arising out of my use of Legion’s services and/or products, and I hereby release and hold harmless Legion and its consultants, officers, contractors, agents, owners and employees from any and all responsibility, liability, cost and expenses, including for injuries, damages or disorders (physical, metabolic, or otherwise), resulting from my use of Legion’s services and/or products.
I understand that fitness activities including, but not limited to, strength, flexibility, and cardiovascular exercise, with or without the use of equipment, are potentially hazardous activities that involve a risk of injury and even death, and I am voluntarily participating in these activities and using equipment and machinery with knowledge of the risks involved. I hereby agree to assume and accept any and all risks of injury or death related to said fitness activities.
I understand Legion’s services and products are not meant to treat or manage any health conditions or circumstances, and I acknowledge that Legion has recommended I obtain a healthcare provider’s approval for my use of Legion’s services and/or products, through regular physical examination(s) and/or consultation. I acknowledge that I have obtained my healthcare provider’s approval or have decided to use Legion’s services and/or products without such approval and hereby assume all responsibility for my use of said services and/or products.
I understand that results from using Legion’s products and/or services are not guaranteed, and I agree to not hold Legion liable for any outcomes or lack thereof.
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Legion's Scientific Review Process
Legion's content is fact-checked and reviewed by a team of scientific, medical and subject-matter experts to ensure everything we publish is evidence based, trustworthy, and current.
If you don’t absolutely love this product, you get a prompt and courteous refund. No forms or returns necessary.
Back
Did you know that some supplements contain dangerously high levels of toxins like lead, arsenic, and cadmium?
That’s why we rigorously test every ingredient in a third-party lab for heavy metals, microbes, allergens, and other contaminants, ensuring they meet the strict purity standards set by the U.S. Food and Drug Administration (FDA) and World Anti Doping Agency (WADA).
EAA is lab-tested for purity and accuracy and independently certified by Labdoor™ to contain no heavy metals, microbes, allergens, or other contaminants or banned substances.
Some supplements don't contain what their labels claim while others carry unhealthy levels of contaminants like lead, arsenic, and cadmium. And the law doesn't require brands to test for accuracy or purity or show you the results.
We do both, and we publish the proof that our products meet or exceed FDA safety guidelines.
Every batch of our supplements is tested for potency, heavy metals, microbes, allergens, and other contaminants—and passes every one.
This product doesn’t just “contain natural ingredients”—every ingredient is naturally sourced from plants and animals. This product contains no artificial or synthetic sweeteners or flavors of any kind.
The ingredient, form, and dose in our product is backed by peer-reviewed scientific research demonstrating clear benefits in healthy humans.
Our product contains no artificial food dyes, fillers, or other unnecessary junk.
Because while these ingredients may not be as dangerous as some people claim, studies show they can cause negative effects in some people, including gastrointestinal toxicity and behavioral disorders.
That’s why we use natural coloring derived from fruits and other foods as well as naturally derived ingredients for enhancing shelf life and facilitating the manufacturing process.
Our scientific review board of nutritionists, dietitians, molecular biologists, doctors, and other accredited experts is responsible for reviewing every article, podcast, and video we produce to ensure they’re evidence based, accurate, trustworthy, and current.
Thanks to their connections, credentials, and academic experience, this team of MDs, PhDs, and other professionals has access to a wealth of research published in the largest and most prestigious journals in the world.
This allows them to not only review individual studies but also analyze the overall weight of the evidence on any and all topics related to diet, exercise, supplementation, and more.
If you feel that any of our content is inaccurate, misleading, out-of-date, or anything less than factual, please let us know in the comments section of the article in question.
Evidence Based
We follow a detailed, rigorous, multi-step process to create content that meets the highest standards of clarity, practicality, and scientific integrity.
First, our research associates provide our editorial team with accurate, up-to-date, proven scientific evidence.
Then, our editorial team uses this research to draft articles and outlines for podcasts and videos.
Finally, our scientific review board reviews the content to ensure all key information and claims are backed by high-quality scientific research and explained simply and precisely.
If you feel that any of our content is inaccurate, misleading, out-of-date, or anything less than factual, please let us know in the comments section of the article in question.
