What is 5-HTP?
5-HTP (5-hydroxytryptophan) is a metabolite of the amino acid tryptophan and a direct serotonin precursor. Serotonin is the "happiness hormone" that regulates mood, sleep, appetite and pain perception. Unlike tryptophan, 5-HTP easily crosses the blood-brain barrier and is directly converted to serotonin in the brain without intermediate steps.
🧪 What the Science Says
😊 Mood Improvement
Studies in this area are small and contradictory, so 5-HTP cannot be considered an effective treatment. It acts on the same systems as some medicines, but with fewer side effects.
😴 Sleep Improvement
5-HTP increases REM sleep duration and improves sleep quality. 200-400 mg before bed reduced sleep onset time and improved sleep depth (Soulairac &).
🍽️ Appetite Control
Serotonin regulates the feeling of fullness. 5-HTP reduced calorie intake and carbohydrate cravings in overweight individuals.
🔎 Another Studied Target
5-HTP has also been studied in other areas, but the studies are small and the conclusions are ambiguous — therefore it cannot be considered a reliable solution and must under no circumstances be used instead of treatment prescribed by a doctor.
📋 Dosage Recommendations
- For mood: 100-300 mg per day, divided into 2-3 doses with food
- For Sleep: 100-200 mg 30-60 min. before bed
- For appetite control: 100-200 mg before a meal
- For Beginners: 50-100 mg per day for the first week
- Maximum dose: 400 mg per day (without medical supervision)
📊 5-HTP vs Tryptophan
| Property | 5-HTP | L-Tryptophan |
|---|---|---|
| Conversion efficiency | 2 steps -> 5-HTP -> serotonin | 2 steps -> 5-HTP -> serotonin |
| BBB permeability | Lightweight | Competes with other amino acids |
| Standard dose | 50-300 mg | 500-2000 mg |
| Food effect | Lower | High (requires an empty stomach) |
| Recommendation | More effective | Milder |
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❓ Frequently Asked Questions
Does 5-HTP cause addiction?
No, 5-HTP does not cause physical addiction. However, as with any mood-affecting supplement, it is not recommended to stop abruptly after long-term use — it is better to reduce the dose gradually.
How does 5-HTP differ from SSRI antidepressants?
SSRIs block serotonin reuptake (more serotonin remains in the synapses), while 5-HTP increases serotonin production. Both increase serotonin activity, but through different mechanisms. NEVER combine them together!