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NOW Foods L-Tryptophan 500 mg. - 120 Vegetarian Capsules

$18.81

Supports Relaxation Pharmaceutical Grade USP Encourages Positive Mood Promotes Restful Sleep Vegetarian Formula L-Tryptophan is an essential amino acid important in human nutrition for the synthesis of melatonin and serotonin hormones regulating mood...

Source Naturals L-Tryptophan

$15.19

The essential amino acid L-tryptophan helps support relaxation, restful sleep, and feeling better. It plays a part in the synthesis of both melatonin and serotonin, hormones involved with mood and stress response. Source Naturals L-TRYPTOPHAN is...

5 HTP (5-Hydroxy L-Tryptophan) 50mg (50 mg 60 small capsules)

$11.49

5-HTP (5-Hydroxy L-Tryptophan) promotes the body's healthy production of serotonin an important substance that supports normal nerve and brain function. Serotonin appears to help maintain balanced sleep patterns moods and the inflammation response system.

NOW Foods 5-HTP (5-Hydroxy-L-Tryptophan) Twin Pack Special 50 mg. - 60 Capsules

$7.24

Griffonia simplicifolia is an African plant which is extracted to produce 5-HTP the intermediate metabolite between the amino acid L-tryptophan and serotonin.

Swanson Ultra 100% Pure Pharm Grade L-Tryptophan

$19.99

It's back, and it's better than ever! L-Tryptophan is a precursor to serotonin, and it's powerfully effective when used properly. By supporting serotonin levels, L-tryptophan not only helps us fall asleep and stay asleep,but it also promotes mental...

NSI L-Tryptophan -- 500 mg -120 Capsules

$17.99

Helps maintain serotonin levels for healthy mood. Also supports natural, restful sleep. How Does NSI® L-Tryptophan work? L-tryptophan is an essential amino acid—meaning the body does not produce it on its own; it must be obtained through diet. It's...