Question 1

What are BCAAs?

Accepted Answer

BCAAs (Branched-Chain Amino Acids) are three essential amino acids: leucine, isoleucine, and valine. They cannot be produced by the body and must come from diet. Leucine is the key driver — it activates the mTOR pathway that triggers muscle protein synthesis. BCAA supplements typically come in a 2:1:1 ratio and make up about 35% of essential amino acids in muscle tissue.

Question 2

What are EAAs?

Accepted Answer

EAAs (Essential Amino Acids) are all nine amino acids the body cannot produce: leucine, isoleucine, valine, lysine, methionine, phenylalanine, threonine, tryptophan, and histidine. EAAs include the three BCAAs plus six additional essential aminos. Building muscle requires all nine — without the complete set, muscle protein synthesis cannot operate at full efficiency.

Question 3

What are the key differences between BCAA and EAA?

Accepted Answer

BCAAs contain only 3 amino acids and can trigger the muscle building signal but are insufficient for complete muscle protein synthesis — the body must borrow remaining aminos from other tissues. EAAs contain all 9 essential amino acids including BCAAs, providing all building blocks for optimal muscle protein synthesis. Research shows EAAs increase muscle protein synthesis by approximately 50% more than BCAAs alone.

Question 4

Which is better — BCAA or EAA?

Accepted Answer

Based on current research, EAAs are superior to BCAAs in most situations because they provide all raw materials muscles need. However, if you already consume adequate complete protein daily (from whey, meat, eggs), both supplements become less necessary — whey already contains all EAAs with high BCAA concentration. Amino acid supplements are most useful for those training fasted or unable to eat protein-rich meals around workouts.

Question 5

When should you take BCAA or EAA?

Accepted Answer

The ideal timing is before and during workouts — especially if training fasted (e.g., morning sessions). Amino acids protect against muscle breakdown and fuel protein synthesis. Recommended doses: BCAA 5-10g, EAA 10-15g before or during training. You can mix them in water and sip throughout the workout. If you ate a protein-rich meal 1-2 hours before training, the supplement's impact will be minimal since blood amino acid levels are already elevated.

BCAA — מה זה, למה זה חשוב, ומה ההבדל מ-EAA?

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