This is a practitioner-only product. We will contact you when you order this product prior to processing your purchase order.
During our complimentary phone consultation with you, we will discuss:

  • Your needs in order to determine whether this product is suitable for you; and/or

  • Whether you have script or referral documentation prescribing this product from a qualified health professional.




  • L-TRYPTOPHAN (1000MG)- Douglas Laboratories

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    • Regular price $69.69
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    L-TRYPTOPHAN (1000MG) in New Zealand 

    L-Tryptophan is an essential amino acid and a precursor for the synthesis of serotonin. Tryptophan crosses the blood-brain barrier and is converted to L-5-Hydroxytryptophan (5-HTP), which in turn is converted into serotonin. Serotonin is an important neurotransmitter necessary for the regulation of appetite, mood, and melatonin production.

    Pack: 60 Capsules