Essential amino acids (EAAs) are the nine amino acids your body needs to build protein but can't make on its own, so they have to come from food or supplements. They're the reason protein quality matters, and they've become one of the most researched topics in sports and healthy-aging nutrition. Here's what EAAs are, how they differ from BCAAs, and who tends to benefit most from paying attention to them.
Quick answer
- There are nine essential amino acids: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine.
- Leucine plays a key role in switching on muscle protein synthesis, the process your body uses to build and repair muscle.
- BCAAs are just three of the nine EAAs. Muscle building needs all nine, which is why complete EAA blends are popular.
- People who tend to benefit most include active adults, older adults, and anyone who struggles to eat enough protein.
What are essential amino acids?
Amino acids are the building blocks of protein. Your body uses 20 of them, and it can make 11 on its own. The other nine are called essential because they must come from your diet.
| Essential amino acid | Also part of the BCAAs? |
|---|---|
| Leucine | Yes |
| Isoleucine | Yes |
| Valine | Yes |
| Lysine | No |
| Threonine | No |
| Phenylalanine | No |
| Methionine | No |
| Histidine | No |
| Tryptophan | No |
Why leucine gets so much attention
Among the nine, leucine acts as a key signal for muscle protein synthesis. That's why researchers have studied leucine-enriched EAA blends closely. In one study of older women, a low dose of leucine-rich essential amino acids stimulated muscle protein synthesis comparably to a much larger dose of whey protein, both at rest and after exercise. A follow-up study looked at the same question across different dosing approaches.
EAAs vs. BCAAs: what's the difference?
BCAAs (branched-chain amino acids) are leucine, isoleucine and valine, three of the nine EAAs. They became popular as a workout supplement, but your body can't build new muscle protein with only three building blocks. In a 2017 study, BCAAs alone did increase muscle protein synthesis after resistance exercise, but the response was smaller than with complete protein. The takeaway: a blend with all nine EAAs gives your body everything it needs to use them.
Who benefits most from essential amino acids?
Active adults
If you lift weights, train regularly or have a physically demanding job, your muscles are constantly repairing. EAAs taken around workouts are a simple way to make sure the building blocks are available.
Older adults
Maintaining muscle becomes a bigger priority with age, and much of the research on leucine-enriched EAAs has focused on older adults for exactly that reason.
People with lighter appetites
Some people find it hard to eat enough protein, whether because of a small appetite, a busy schedule or simply not enjoying large protein-heavy meals. An EAA drink adds essential amino acids without a full meal.
“These come in handy at the end of the day when i'm not hungry enough to consume my last 30g of protein.”
— Gladis, Aminos Pure customer review
Plant-based eaters
Many plant foods contain lower amounts of one or more essential amino acids, so people eating mostly plants often pay closer attention to getting all nine.
How to get essential amino acids
From food: complete proteins such as eggs, dairy, meat and fish contain all nine. Plant sources can provide all nine when combined across the day.
From a supplement: our Aminos Pure provides all nine essential amino acids in plant-based, fermented form, enhanced with extra leucine. Each 2.5-teaspoon serving supplies at least 4,000 mg of EAAs, including at least 1,421 mg of leucine, flavored only with real pineapple, coconut nectar and lemon. Mix it into 8 oz of water, 1 to 3 times a day; before a workout is a popular time.
Who should check with a provider first
Essential amino acid supplements are generally used as part of a normal diet, but check with your healthcare provider first if you have kidney or liver conditions, take medication, or are pregnant or nursing. People with phenylketonuria (PKU) should avoid products containing phenylalanine, including Aminos Pure.
FAQ
What are the 9 essential amino acids?
Histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine. Your body can't make them, so they must come from food or supplements.
Are EAAs better than BCAAs?
BCAAs are three of the nine EAAs. Because muscle protein synthesis needs all nine, a complete EAA blend covers what BCAAs alone can't.
When is the best time to take essential amino acids?
Many people take them before or after a workout, but they can be taken any time of day, including as a protein top-up on lighter-eating days.
Can I get enough essential amino acids from food?
Yes, a varied diet with complete proteins provides all nine. Supplements are a convenient option when your protein intake falls short or your needs are higher.
Is Aminos Pure plant-based?
Yes. The amino acids in Aminos Pure are plant-based and produced by fermentation, with no artificial flavors.
Written by Jess, who helps Raw Revelations customers understand the ingredients and research behind our products.
