BCAAs (Branched-Chain Amino Acids)
L-leucine, L-isoleucine, L-valine. Dietary Supplement, amino acid.
This page describes what BCAAs (Branched-Chain Amino Acids) is and its known risks. It is not medical advice and not a guide to using it. Many of these substances are prescription-only or illegal to use without a prescription. Speak to a doctor.
- Class
- Dietary Supplement
- Legal status
- Over-the-counter (unrestricted)
- Half-life
- ~2-3 hours (plasma)
- Liver strain
- None at typical doses
- Kidney strain
- None at typical doses
- Converts to estrogen
- None
- Suppresses natural hormones
- Not typically
What it does in the body
Metabolic
- Leucine signals muscle protein synthesis
- Little added benefit when daily protein intake is already adequate
Forms, half-life and detection
| Form | Half-life | Reported detection window |
|---|---|---|
| Oral (powder/capsule) | ~2-3 hours (plasma) | N/A (not a banned substance) |
Side effects and health risks
Gastrointestinal
- Mild stomach upset at high doses
Related compounds
Questions
What is the half-life of BCAAs (Branched-Chain Amino Acids)?
About ~2-3 hours (plasma). Half-life is the time for the level in the blood to fall by half.
How long is BCAAs (Branched-Chain Amino Acids) detectable?
Testing windows of N/A (not a banned substance) are reported, depending on the test and the person.
Is BCAAs (Branched-Chain Amino Acids) legal?
Over-the-counter (unrestricted). Laws differ by country and change; check the rules where you live.
What blood tests matter with BCAAs (Branched-Chain Amino Acids)?
Ask a doctor which tests suit you.
What are the side effects of BCAAs (Branched-Chain Amino Acids)?
Gastrointestinal: mild stomach upset at high doses.
For information only, not medical advice. MyoStats is a tracking tool used at your own discretion. Speak to a doctor before changing your training, diet, medication or anything you take.