L-Tryptophan supports mood and sleep by giving the essential amino acid needed to make serotonin and melatonin, which helps relaxation and restful nights. Calm is closer with daily use. Star ingredient L-tryptophan is a precursor to serotonin and melatonin, helping regulate mood and sleep cycles and supporting emotional balance for daytime calm and more restful nights overall. NOW Foods backs quality. GMP-certified facilities and careful batch testing ensure safety.

Available Sizes & Variants:

120 Veg Caps – convenient daily dose.

Benefits & Features:

• Supports mood with a calm, relaxed mindset.
• Promotes restful sleep by supplying the brain with the building blocks for melatonin.
• Star ingredient L-tryptophan is a precursor to serotonin and melatonin, helping regulate mood and sleep cycles and supporting emotional balance for daytime calm and more restful nights overall.
• Plant-based capsule makes daily use convenient and easy to swallow, with gentle digestion.
• Quality assurance includes batch testing for purity and microbial safety, with plant-derived capsules and Kosher, vegan, and halal certifications to suit diverse dietary needs today.

NOW Foods has built a long standing reputation for purity and reliability. L-Tryptophan is produced in GMP-certified facilities, and every batch is tested to be free of Peak E and microbial contamination. The capsules are plant-based, suitable for vegan, kosher and halal diets, reflecting the brand’s transparent quality standards. For a well rounded routine, many customers pair it with a vitamin d supplement, probiotics, or magnesium glycinate.

L-Tryptophan (Free-Form), Cellulose (capsule), cellulose powder, stearic acid (vegetable source).
Not manufactured with wheat, gluten soy, milk, egg, fish, shellfish or tree nut ingredients.
Produced in a GMP facility that processes other ingredients containing these allergens.

• GTIN: 733739001672
• Manufacturer: Now Foods
• Categories: New ArrivalsNOW FoodsTryptophan Supplements
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Take 1-2 capsules on an empty stomach 2 to 3 times daily, with the last dose at bedtime, or follow your physician's directions. Take one (1) capsule daily with food\, or as recommended by a healthcare practitioner.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: L-Tryptophan

L-Tryptophan is basically an essential amino acid the body uses to make serotonin and melatonin, helping normal mood regulation and sleep patterns. This product offers free-form L-Tryptophan in a plant-based capsule suitable for vegetarian and vegan diets.

Source and form information show the ingredient is supplied as free-form L-Tryptophan to support normal physiological processes involved in relaxation and sleep regulation.

What Does L-Tryptophan Do?

L-Tryptophan acts as a precursor to serotonin and melatonin, which are involved in mood and sleep regulation. Scientific literature and EFSA-aligned guidance acknowledge its role in supporting these normal functions and the body’s natural sleep-wake cycle.

Dr. Richards from a UK university found that L-Tryptophan can influence sleep-related pathways, reinforcing its use as a nutrient to support relaxation and daily well-being in line with established guidance.

This supplement is not intended to diagnose, treat, cure, or prevent any disease.

NOW Foods kicks off with production excellence, making it our trusted pick for L-Tryptophan. This brand is known for GMP-certified facilities that uphold current manufacturing best-practice standards, ensuring every lot meets strict safety and purity benchmarks. The commitment to quality shows through routine testing to keep products free from Peak E and microbial contamination, reinforcing reliability across batches.

NOW Foods has built a respected heritage as a long-standing, widely recognised supplier in the dietary supplement industry, with certifications that reflect their dedication to safe, inclusive nutrition. Their products are Non-GMO, Kosher, Vegetarian/Vegan and Halal certified, aligning with diverse dietary needs and consumer values. We selected NOW Foods over alternatives because of their transparent, safety-focused testing philosophy and broad accessibility within the market, which supports consistent quality across supplies. This brand’s robust quality framework guards both the purity of L-Tryptophan and the integrity of the finished product.

This brand–product match is particularly well suited for L-Tryptophan, given NOW Foods' emphasis on pharmaceutically pure ingredients and batch-level testing. Our evaluation by our team of medical experts and the commitment to how we verify ingredient quality underpin the confidence in this partnership.