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Zahler's L-Tryptophan is a high-potency serotonin enhancer and contains 500 mg of L-Tryptophan per capsule.

  • High potency serotonin booster
  • Mood, relaxation and sleep support
  • Contains 500 mg L-Tryptophan per capsule
Gluten free
Dairy Free
Soy Free
Vegetarian Friendly
Regular price $19.47
Regular price Sale price $19.47
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Buy it with:

Advanced science in each and every bottle

Using only the purest natural ingredients

Manufactured to the highest standards

Kosher through & through


  • High potency serotonin booster
  • Mood, relaxation and sleep support
  • Contains 500 mg L-Tryptophan per capsule

L-Tryptophan is used by the brain as a precursor to serotonin and melatonin, neurotransmitters that are necessary for normal sleep. In addition to normal sleep, changes in the level of serotonin in the brain can impact mood and satiety. Adequate sleep is crucial for both healthy immune and nervous systems. Zahler's L-Tryptophan is a potent and purified fom which effectively crosses the blood-brain barrier.

More about L-Tryptophan:
It is highly probable that unhealthy eating habits, as well as too much stress and too little time, make that few people are able to meet their body's requirement for L-Tryptophan and therefore really ought to supplement their intake of this vital amino acid. A deficiency in this essential amino acid can lead to erratic mood swings and occasionally even depression, as L-Tryptophan performs important functions in the nervous system as a producer of messengers. Zahler's L-Tryptophan contains a robust dose of 500 mg per capsule in a most potent and purified form.

Supplement facts

What’s inside



Customer Reviews

Based on 14 reviews
Wendy L.,

Sleep support and mood

Amino Acid

Good Amino Acid for Sleep and Mood

Fred Jaffe

Sleep and Calming Supplement

Eva Folgan
calm and happy

I feel so much better since starting this. I take one in the morning and one before bed..


This helps me with staying happy, calm and well rested. I will continue this supplement now every day.

Please note: We do our best to ensure the accuracy of the product images and information. That being said, since we are constantly upgrading our formulas, the product you receive may differ from what is shown on our website. Please read the label, warnings and directions of the product you receive and don’t rely solely on the details provided by our website.

What’s in a bottle

Every proprietary Zahler formula is exactly the same:
its efficacy stems purely from Mother Nature

Our Formula
Our Formula

Zahler delivers on nature’s promise by harvesting its many natural resources, opting for 100% pure, authentic, strictly Kosher ingredients

Accountable Alternatives

Focusing on underlying deficiencies as opposed to superficial symptoms, our formulas offer a healthy, effective path toward comprehensive wellbeing

Scientific Support

Our life-giving supplements are the product of hard data, backed by published research and clinical trials from the industry's most trusted sources