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Essential Amino Acids (EAAs)

Complete muscle protein synthesis stimulus

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Written to our editorial standards · reviewed against published research· Updated 2 Jun 2026
Last reviewed: May 30, 2026
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Essential Amino Acids: Complete muscle protein synthesis stimulus. All 9 essential amino acids in optimal ratios. More effective than BCAAs alone for triggering muscle protein synthesis. Standard dose 10 g, taken in the pre-workout, about $38/month. Evidence rating: strong evidence.

What is Essential Amino Acids?

Essential amino acids (EAAs) are the nine amino acids the body cannot synthesize and must obtain from diet: leucine, isoleucine, valine, lysine, methionine, threonine, phenylalanine, tryptophan, and histidine. While BCAA supplementation focuses on just three of these, more recent research consistently shows that complete EAA blends produce a stronger and more sustained muscle protein synthesis response, because all nine amino acids are required to build new muscle tissue. EAAs are particularly useful for older adults (whose anabolic resistance demands a stronger leucine threshold), fasted training, and people pursuing recomposition. Standard dose is 5-15 g per serving, taken before or during training.

WHY IT MATTERS

All 9 essential amino acids in optimal ratios. More effective than BCAAs alone for triggering muscle protein synthesis.

Natural food sources

Where possible, get Essential Amino Acids from whole foods first. Common dietary sources include:

EggsMeat & poultryFishDairySoybeans

Where to buy

Kion Kion Aminos (Unflavored Tablets)
RECOMMENDED
Kion, Essential Amino Acids
10 g · Pre-workout · ~$38/month

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Common questions

What is Essential Amino Acids?
Essential amino acids (EAAs) are the nine amino acids the body cannot synthesize and must obtain from diet: leucine, isoleucine, valine, lysine, methionine, threonine, phenylalanine, tryptophan, and histidine. While BCAA supplementation focuses on just three of these, more recent research consistently shows that complete EAA blends produce a stronger and more sustained muscle protein synthesis response, because all nine amino acids are required to build new muscle tissue. EAAs are particularly useful for older adults (whose anabolic resistance demands a stronger leucine threshold), fasted training, and people pursuing recomposition. Standard dose is 5-15 g per serving, taken before or during training.
What is Essential Amino Acids used for?
Complete muscle protein synthesis stimulus. All 9 essential amino acids in optimal ratios. More effective than BCAAs alone for triggering muscle protein synthesis.
What is the standard dose of Essential Amino Acids?
10 g, typically taken in the pre-workout. Approximate cost is $38 per month.
How strong is the evidence for Essential Amino Acids?
Strong evidence for its primary uses. See the full study list on the research page.

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