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.
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| Product Name | Brand | Size | Lowest Price | Rating | Main Ingredient Per Dollar | Go to Cheapest Store |
| L-Tryptophan Capsules | Source Naturals | No Ratings | 3.06 Grams of L-Tryptophan per dollar |  | ||
| L-Tryptophan | Doctor's Best | No Ratings | 2.98 Grams of L-Tryptophan per dollar | | ||
| L-Tryptophan Capsules | Source Naturals | No Ratings | 2.74 Grams of L-Tryptophan per dollar | | ||
| L-Tryptophan Capsules | Source Naturals | No Ratings | 2.52 Grams of L-Tryptophan per dollar | |