Phenylalanine vs Tyrosine for mood
Short answer: For mood, more users report improvement with Phenylalanine — 88% of 8 reports, versus 83% of 259 for Tyrosine.
Phenylalanine has 158 meta-analyses and 648 randomized trials on PubMed; Tyrosine has 2,190 and 1,766.
Based on 49 reports about Phenylalanine and 1,662 about Tyrosine. Not medical advice.
| Phenylalanine Supplement | Tyrosine Supplement | |
|---|---|---|
| Users say it helped | 78%helped9 reports · few reports | 55%helped632 reports · high confidence |
| Verdict | Mostly positive | Mixed |
| Research | AResearch: Strong | AResearch: Strong |
| Meta-analyses / RCTs | 158 / 648 | 2,190 / 1,766 |
| Mainly used for | ||
| Focus % reporting improvement | — | 85% (294) |
| Mood % reporting improvement | 88% (8) | 83% (259) |
| Energy % reporting improvement | 100% (5) | 91% (238) |
| Anxiety % reporting improvement | — | 57% (53) |
| Libido % reporting improvement | — | 73% (15) |
| Common side effects | binge eating | anxiety, headache, irritability, jitteriness |
| Typical dose reported | 500 mg | 500 mg / daily |
In studies using high-throughput metabolomics, several blood amino acids appear to be consistently associated with the risk of developing type 2 diabetes.
Diabetes Care, 2016 ↗“Phenylalanine changed my life around that time! There's really nothing natural I've tried that comes close to fixing the phenylethylamine deficiency”
In patients with EGFR-mutated NSCLC, first and third generation EGFR tyrosine kinase inhibitors, as well as combination therapies with antiangiogenesis, were associated with increased risks of cardiovascular adverse events. Risks were significantly higher with third generation compared with first generation inhibitors.
BMJ, 2025 ↗“I stack taurine with tyrosine and creatine and that has helped my mood noticeably and also helps me feel stronger and more energetic.”
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Percentages come from first-hand user reports and are not clinical outcomes. Talk to a doctor before starting, stopping or combining anything. How we rate