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L-Tryptophan is an essential amino acid that is converted in the body to serotonin, an important neurotransmitter that supports many functions in the brain and is used to aid sleep. As we age, many find it more difficult to get a good night's rest and L-Tryptophan can help maintain serotonin levels to support normal sleep.*

Health Benefits

The benefits you may see when using Superior Labs L-Tryptophan include:

  • Promote normal circadian rhythms and healthy sleep patterns
  • Support mood balance
  • Encourage healthy serotonin levels
  • Promote relaxation
  • Ease symptoms associated with Premenstrual Syndrome (PMS)
  • Improve exercise performance


This amino acid was first isolated from the milk protein, casein, in 1901 by Sir Frederick Hopkins. He was able to identify the fact that tryptophan wasn't able to be produced by the body, which makes it only available in supplemental form or through diet.


L-Tryptophan, Plant Cellulose (vegetable capsules), Organic Rice Concentrate


As a dietary supplement, adults take 1 capsule two to three times daily, or as directed by your healthcare practitioner. Best when taken with a meal.

How our L-Tryptophan is Extracted, Harvested, Processed and Manufactured

L-Tryptophan is produced through a fermentative process where large batches of bacteria is grown. L-Tryptophan is extracted from the bacteria and, ultimately, purified into the finished supplement. L-Tryptophan is an essential amino acid found in many plant and animal proteins. The term "essential" is used because our bodies can't synthesize this amino acid on its own, we have to get it from the food we eat or through a supplemental form. According to Wikipedia, "Tryptophan is also a precursor to the neurotransmitter serotonin, the hormone melatonin, and vitamin B3". This means, in order for the serotonin in our bodies to perform optimally, we need L-Tryptophan. In turn, melatonin is synthesized from serotonin.

WHAT YOU WON'T FIND IN OUR PRODUCTS is harmful magnesium stearate, dioxides, preservatives, or other potentially harmful artificial ingredients of any kind. This means you can rest easy knowing you are receiving the safest, most efficient, and chemical-free product possible. We are committed to our customers, community, and planet.


Do not exceed the recommended dosage. Please consult a physician if pregnant or nursing, taking medication, or have a medical condition before consuming this product. Not intended for use by individuals under the age of 18. Store in a cool, dry place. Do not use if safety seal is damaged or missing. KEEP OUT OF REACH OF CHILDREN.