L-Leucine
People mainly take L-Leucine for performance. Based on 3 first-hand reports. Ranked #1181 of 1,974 overall.
14
User score
Mostly positive33% positive0% mixed0% negative67% unclear
Of reports that state an outcome, 100% are positive.
Clinical research
Research pending
What L-Leucine does, according to users
Of the people who reported each effect, the share who said it got better.
betterno changeworse
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
Research data for L-Leucine is being compiled.
Dosage people report
As stated by users — not a recommendation. Follow the label or your doctor.
10%peri-workout
5 grams1 hour pre-workout
Reported side effects
How often each side effect came up across all reports.
No side effects reported so far.
What users say
Verbatim quotes, shortened only — each links to the original discussion.
“L-Leucine...for bodybuilding mix at 10%”
“most studies on amino acids don't show any significant indication of extra gains if protein levels are already sufficient”
“I'm a firm believer in l-leucine and there are studies to back it up. I notice a big difference when I take it”
Other options for performance
Resistance Training
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100% report better performance
Mostly positive
Retatrutide
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92% report better performance
Mostly positiveBResearch: Moderate
Tirzepatide
Medication · 219 reports
88% report better performance
Mostly positiveAResearch: Strong
Creatine Monohydrate
Supplement · 139 reports
96% report better performance
Mostly positiveAResearch: Strong
Magnesium Malate
Supplement · 103 reports
100% report better performance
Mostly positiveDResearch: None
Semaglutide
Medication · 137 reports
80% report better performance
Mostly positiveAResearch: Strong
User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 2, 2026. How we rate