By the Zespo team · Updated 26 October 2026
L-tryptophan is one of the nine essential amino acids, the building blocks of protein that the body cannot make and must get from food. It was first isolated in 1901 by the British biochemist Frederick Gowland Hopkins.
Food sources
Tryptophan is present in most protein-rich foods, including milk, curd, paneer, oats, soy, pumpkin and sesame seeds, peanuts, eggs and chicken. It is usually present in smaller amounts than other amino acids.
On the label
Supplement L-tryptophan is produced by fermentation and listed in milligrams per serving. Do not confuse it with 5-HTP, a different compound sold separately.
Speak to a doctor before use if you take any prescription medicine.
What to check before you buy
- The amount of each ingredient per serving, not just per capsule
- How many capsules make one serving and how many servings are in the pack
- Whether any ingredient sits inside an undisclosed "proprietary blend"
- An FSSAI licence number and the veg/non-veg mark on the pack
Label facts: Zespo L-Tryptophan 500 mg - 90 Veg Capsules
- Essential amino acid - the body cannot produce it on its own
- Free-form L-tryptophan, 500 mg per single-capsule serving
- 90 servings per bottle, single ingredient
- Made in India in a GMP-certified facility, FSSAI-licensed
See Zespo L-Tryptophan 500 mg - 90 Veg Capsules on zespo.in · Also on Amazon.in (search "Zespo").
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Zespo products are food supplements, not medicines. This article is for general information and is not medical advice. Take supplements as directed on the label and speak to a qualified healthcare professional if you are pregnant, nursing, taking medication or have a medical condition.
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