Leucine
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Evidence Summary
L-Leucine is a branched-chain amino acid (BCAA) primarily studied for its role in stimulating muscle protein synthesis and preventing muscle wasting. Research indicates its potential utility in managing muscle loss in specific populations, such as the elderly and those suffering from critical illness or malnutrition.
Evidence by Condition
Meta-analysis suggests that supplementation with whey protein, leucine, and Vitamin D can be effective in treating sarcopenia.
Research is investigating whether leucine-enriched BCAAs can improve muscle thickness and reduce inflammatory markers like IL-6 in critically ill patients.
Clinical trials are exploring whether supplemental leucine can offset muscle loss caused by periods of inactivity.
Studies have looked at adding leucine to protein supplements to induce protein anabolism in malnourished COPD patients.
Effective Doses
Dose ranges were not specified in the provided research abstracts.
Key Findings
- A meta-analysis supports the use of whey protein, leucine, and Vitamin D for patients with sarcopenia (PMID: 36771225).
- Leucine-enriched BCAAs are being studied for their impact on muscle thickness and SOFA scores in critical illness (NCT06167772).
- Leucine supplementation is being investigated for its ability to prevent disuse-induced muscle atrophy (NCT03762278).
Limitations
Much of the available research focuses on small-scale clinical trials or specific clinical populations (e.g., the elderly or critically ill), leaving a gap in evidence for healthy, young populations.
Safety & Interactions
No specific contraindications or drug interactions were identified in the provided research.
AI-generated summary from 8 peer-reviewed studies. Not medical advice. Always consult a healthcare provider.
Claims vs. Evidence
| Claim Type | % of Products | Evidence Required | Status |
|---|---|---|---|
| All Other | 100% | Tier D (Unclassified) | ✅ Supported |
| Structure/Function | 90% | Tier C (DSHEA Structure/Function (no pre-approval)) | ✅ Supported |
| Nutrient | 56% | Tier D (Unknown) | ✅ Supported |
Research by Topic
Research Evidence (8)
**Chang et al., 2023** | Nutrients | Meta Analysis Chang Min Cheol, Choo Yoo Jin. Effects of Whey Protein, Leucine, and Vitamin D Supplementation in Patients with Sarcopenia: A Systematic Review and Meta-Analysis. Nutrients. 2023-Jan-19;15(3). doi:10...
**NCT ID**: NCT06167772 **Phase**: NA **Status**: COMPLETED **Enrollment**: 40 **Completion**: 2024-05-10
**NCT ID**: NCT03511092 **Phase**: NA **Status**: COMPLETED **Enrollment**: 53 **Completion**: 2017-10-28
**NCT ID**: NCT03762278 **Phase**: NA **Status**: COMPLETED **Enrollment**: 24 **Completion**: 2019-05-01
**NCT ID**: NCT03831399 **Phase**: PHASE1 **Status**: COMPLETED **Enrollment**: 59 **Completion**: 2019-10-14
**NCT ID**: NCT05009654 **Phase**: NA **Status**: COMPLETED **Enrollment**: 16 **Completion**: 2018-01-31
**NCT ID**: NCT01154400 **Phase**: NA **Status**: COMPLETED **Enrollment**: 12 **Completion**: 2011-07
**NCT ID**: NCT01922167 **Phase**: NA **Status**: COMPLETED **Enrollment**: 19 **Completion**: 2018-12-17
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Frequently Asked Questions
What is L-Leucine and how does it work?
L-Leucine is a branched-chain amino acid (BCAA) that plays a key role in stimulating muscle protein synthesis. It is primarily studied for its potential to help prevent muscle wasting.
Does L-Leucine help with sarcopenia?
There is moderate evidence suggesting that a combination of leucine, whey protein, and Vitamin D can be effective in treating sarcopenia. This may be particularly useful for elderly populations.
Can L-Leucine prevent muscle loss from inactivity?
There is currently insufficient evidence to confirm if leucine supplementation can offset muscle atrophy caused by periods of disuse. Clinical trials are still investigating this potential benefit.
Is L-Leucine effective for patients in critical illness?
There is currently insufficient evidence regarding the use of leucine-enriched BCAAs for critically ill patients. Researchers are still studying whether it can improve muscle thickness or reduce inflammatory markers.
Can L-Leucine help with malnutrition in COPD patients?
There is insufficient evidence to determine if adding leucine to protein supplements helps malnourished COPD patients. Studies are ongoing to see if it can effectively induce protein anabolism in this group.
Are there any side effects or drug interactions with L-Leucine?
No specific drug interactions or contraindications have been identified in the available research. However, no specific groups to avoid or safety limits were documented in the provided studies.
What is the recommended dose of L-Leucine?
The provided research does not specify an effective or recommended dose range for L-Leucine. You should consult a healthcare professional for personalized dosing advice.
Answers generated from research evidence. Not medical advice.