D-Phenylalanine
People mainly take D-Phenylalanine for mood, recovery. Based on 4 first-hand reports and 0 meta-analyses & systematic reviews in the medical literature. Ranked #1085 of 1,974 overall.
Of reports that state an outcome, 100% are positive.
What D-Phenylalanine does, according to users
Of the people who reported each effect, the share who said it got better.
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
At least one meta-analysis, or 5+ randomized controlled trials. The grade measures how much human research exists — read the conclusions below for what it found.
Dosage people report
As stated by users — not a recommendation. Follow the label or your doctor.
Reported side effects
How often each side effect came up across all reports.
What users say
Verbatim quotes, shortened only — each links to the original discussion.
“Provided surprising mood boosting properties and decreased back pain. It also made me feel uncomfortable/weird”
“D-Phenylalanine... not only does D-Phenylalanine have sub-par reviews, it's surprisingly obscure”
“D-Phenylalanine**: [~38%]”
Top discussions (3)
- The oral bioavailability of EVERY nootropic (84+) ↗
- Coupling D-Phenylalanine and N-Acetyl-L-Cysteine Hypothesizing Balancing Endorphinergic and Glutaminergic Systems to Treat and Prevent Relapse to Reward Deficiency Behaviors: Coupling D-Phenylalanine and N-Acetyl-L-Cysteine (NAC) as a Novel Therapeutic Modality ↗
- A Review of Several "Cutting Edge" Nootropics Part 2 ↗
Other options for mood
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