Tryptophan
What is Tryptophan?
Trytophan is an essential amino acid to humans, and is the precursor to serotonin via the intermediate amino acid, 5-Hydroxytryptophan (or 5-HTP). The serotonin can then be converted to melatonin. Both of these chemicals are useful because serotonin is an anti-depressant, and melatonin assists in quality sleep.
Where to Buy Tryptophan Cheap:
| Product Name | Size | Lowest Price | Main Ingredient / Dollar | Go to Cheapest Store |
| Doctor's Best L-Tryptophan | 90 Capsules | 2.65 Grams of L-Tryptophan per dollar | ![]() | |
| Source Naturals L-Tryptophan Capsules | 120 Capsules | 2.25 Grams of L-Tryptophan per dollar | ![]() | |
| Source Naturals L-Tryptophan Capsules | 60 Capsules | 2.17 Grams of L-Tryptophan per dollar | ![]() | |
| Source Naturals L-Tryptophan Capsules | 30 Capsules | 1.81 Grams of L-Tryptophan per dollar | ![]() |


