NOW Foods L-Tryptophan delivers pharmaceutical-grade, free-form L-tryptophan for mood balance and restful sleep, helping you feel steadier and wake refreshed. The formula is vegetarian friendly, using vegetable-based capsules with no major allergens, backed by GMP facilities and peak E free testing for purity. NOW Foods' commitment to transparency and quality assurance sets it apart in a crowded market.

Benefits & Features:

• Supports mood and sleep quality.
• Pharmaceutical grade, free-form L-tryptophan per capsule supports reliable dosing.
• For bedtime use, 1–2 capsules before bed can help ease sleep onset and improve subjective sleep satisfaction.
• Manufactured in GMP facilities and tested for Peak E contaminant and microbial safety, ensuring purity and consistent potency across batches.
• Vegetarian and vegan friendly, with capsule shells from cellulose or hypromellose and no major allergens, making it easy to fit into varied dietary preferences and daily wellness routines.

NOW Foods has built a reputation for transparency and pharmaceutical grade quality. Each batch is tested for Peak E avoidance with clear allergen statements and vegan friendly capsules, underscoring a long standing commitment to purity and potency. The brand operates in GMP facilities to ensure consistent quality across lots, with non-GMO ingredients that fit into many wellness routines. Some customers pair it with a vitamin d supplement or magnesium glycinate as part of their daily wellness, and some even include n acetylcysteine in their routine.

L-Tryptophan (Free-Form) 1 g (1,000 mg), Hypromellose (cellulose capsule), Rice Flour, Ascorbyl Palmitate, Stearic Acid (vegetable source).

• GTIN: 733739001665
• Manufacturer: NOW Foods
• Size: 60 Capsules
• Categories: Best SellersNOW FoodsSports Supplements Black Friday SaleSubscribe & Save ProductsTryptophan 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 2 to 3 times daily on an empty stomach, with the final dose at bedtime, or as directed by your physician. Store in a cool, dry place after opening. For adults only. Consult a physician if pregnant/nursing, taking medication (especially antidepressants such as SSRIs and MAOIs), or have a medical condition. May cause drowsiness. Do not use with alcoholic beverages or while operating heavy machinery. Keep out of reach of children.

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

The Active Ingredient Is: L-Tryptophan

L-Tryptophan is an essential amino acid that acts as a building block for proteins and a precursor in making serotonin and melatonin, which help with mood and sleep regulation.

This variant is pharmaceutical-grade free-form L-tryptophan, suitable for vegetarians, with a strong focus on purity and rigorous quality testing during production.

What Does L-Tryptophan Do?

L-Tryptophan contributes to normal sleep and mood regulation through its role in serotonin and melatonin production, in line with accepted nutritional functions.

Research indicates improvements in sleep parameters and mood in some individuals when used appropriately, with evidence cited by Dr. Hartmann of a university in relation to sleep quality after bedtime use.

It supports normal immune and nervous system function as part of the body’s serotonergic pathways, aligning with standard EFSA-compatible explanations of amino acid metabolism.

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

NOW Foods is recognised for pharmaceutical-grade quality and a strong manufacturing foundation, with L-Tryptophan produced in GMP-certified facilities and routine testing to ensure freedom from Peak E and microbial contaminants. This solid reliability underpins our decision to partner with NOW Foods for this supplement, reinforcing Welzo’s commitment to purity, safety and consistent potency. The brand also demonstrates clear ingredient transparency, supplying non-GMO, vegetarian/vegan-friendly ingredients and accessible allergen statements, which aligns with our safety and inclusivity standards. Our evaluation team, including Welzo's healthcare professionals, examined NOW Foods’ quality assurances and production discipline to ensure steadfast performance in everyday use, and this assessment is supported by our rigorous testing protocols. For more on the people behind the decision, visit Welzo's healthcare professionals.

The product itself benefits from NOW Foods’ commitment to purity and potency, making it a natural fit for L-Tryptophan, a single-ingredient capsule designed to support mood and sleep pathways. This alignment is precisely why NOW Foods stands out against alternatives in our market. The partnership is underpinned by UK-safety standards and clear compliance practices, ensuring trustworthy supply for our customers.