PMID-37049610 – Carnosine and Beta-Alanine Supplementation Narrative Review
Prokopieva VD, Yarygina EG, Bokhan NA, Ivanova SA. "Carnosine and Beta-Alanine Supplementation in Human Medicine: Narrative Review and Critical Assessment," Nutrients, 2023;15(7):1770.
Quick Reference
| Property | Value |
|---|---|
| PMID | 37049610 |
| DOI | 10.3390/nu15071770 |
| Year | 2023 |
| Journal | Nutrients |
| Study Type | Narrative Review |
| Evidence Level | V |
| Sample | N/A (review) |
| Peptide(s) Studied | Carnosine |
Key Findings
- Carnosine (beta-alanyl-L-histidine) is the most abundant histidine-containing dipeptide in human muscle and brain tissue
- Concentrations: skeletal muscle (5-10 mM), olfactory bulb (~5 mM), brain (~1 mM), other tissues (~0.1-1 mM)
- Multiple biological activities: antioxidant (ROS scavenging, metal chelation), anti-glycation (AGE inhibition), pH buffering (exercise performance), anti-inflammatory, anti-senescence
- Oral carnosine is rapidly hydrolyzed by serum carnosinase (CN1) to beta-alanine + L-histidine, limiting bioavailability — but intracellular resynthesis occurs in target tissues
- Beta-alanine supplementation increases muscle carnosine (rate-limiting precursor) — 4-10 weeks of 3-6 g/day beta-alanine increases muscle carnosine by 40-80%
- Human clinical evidence: beneficial effects in exercise performance (meta-analyses support ergogenic effect of beta-alanine), diabetes (improved glycemic markers), cognitive function in elderly, autism spectrum disorder (emerging data)
- Carnosine levels decline with aging (20-30% reduction in muscle carnosine in elderly vs young adults)
- Neuroprotective: carnosine reduces protein aggregation relevant to Alzheimer's and Parkinson's disease
Study Design
Comprehensive narrative review covering carnosine biochemistry, pharmacokinetics (including the carnosinase problem), supplementation strategies (direct carnosine vs beta-alanine), and clinical applications across metabolic, neurological, and exercise performance domains.
Limitations
- Narrative review; no systematic methodology
- Many clinical applications based on limited human trial data
- The carnosinase bioavailability challenge remains incompletely resolved
- Optimal dosing for anti-aging vs exercise applications may differ substantially
- Some proposed mechanisms extrapolated from in vitro concentrations that may not be achieved in vivo
Clinical Relevance
This review synthesizes the full spectrum of carnosine biology relevant to functional medicine and anti-aging applications. Key practical takeaways: (1) direct carnosine supplementation provides systemic benefits despite carnosinase degradation (brain and muscle can resynthesize from precursors), (2) beta-alanine supplementation is a validated strategy to increase muscle carnosine for exercise performance, (3) carnosine's anti-glycation, antioxidant, and anti-senescence properties make it a mechanistically rational anti-aging supplement, and (4) age-related carnosine decline provides rationale for supplementation in elderly populations.
Related
#research #narrative-review #evidence-level-V #carnosine #anti-aging