Doctor's Best L-Tryptophan is a dietary supplement made to support mood and sleep by delivering the essential amino acid L-Tryptophan that turns into serotonin in the brain. It's vegan, non GMO, gluten free and soy free, showing our commitment to purity and clear ingredients. The star ingredient helps mood balance and restful sleep by supporting healthy serotonin levels.

Benefits & Features:

• L-Tryptophan supports mood stability all day long.
• L-Tryptophan is converted into serotonin in the brain, a key neurotransmitter that helps regulate mood and support restful nights.
• Each capsule is made with vegetarian friendly ingredients and avoids common allergens, making a clean option for daily use and easier integration into your wellness routine.
• Doctor's Best is a trusted name in supplements, prioritising purity and clear ingredient sourcing.
• For best absorption, take on an empty stomach away from protein rich meals.

Doctor's Best has a long standing focus on science led formulas and transparent ingredients. This L-Tryptophan supplement sits in a vegan friendly line designed for everyday use. The core idea is simple: it provides a reliable serotonin precursor to support mood and sleep, with quality you can trust. Some customers pair it with n acetylcysteine or vital proteins collagen peptides as part of a broader wellness routine, reflecting how our products fit into real life health regimes.

L-Tryptophan 500 mg, Hypromellose (vegetarian capsule), Microcrystalline cellulose, Calcium laurate.

• GTIN: 753950001268
• Manufacturer: Doctor's Best
• Categories: Best SellersDoctor's BestSubscribe & 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 capsule daily, preferably 30 minutes before bedtime, with plenty of water. For optimum absorption, take separately from protein-containing foods. Store in a cool, dry place. Consult your physician before use if pregnant, lactating, have a medical condition, or are taking medications. May cause drowsiness.

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 (vital) amino acid that acts as a precursor to serotonin, a key brain chemical involved in mood and sleep regulation. In supplement form it provides the building block for serotonin production in the body.

This form is presented as a vegetarian capsule containing the amino acid in a carrier suitable for vegan and gluten-free formulations, supporting a pure and transparent ingredient profile.

What Does L-Tryptophan Do?

L-Tryptophan plays a role in the synthesis of serotonin in the brain, a neurotransmitter linked to mood and sleep. Scientific understanding supports its involvement in regulating these normal biological processes, contributing to daily psychological and sleep-related function.

This information aligns with established guidance on amino acids supporting serotonin pathways and healthy sleep and mood regulation.

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

Doctor's Best is chosen for its solid manufacturing ethos and commitment to purity at the source. This brand prioritises clear ingredient choices and readily available, non-GMO, gluten-free and vegan formulations, underscoring a thoughtful approach to quality from the outset. Its approach to product development reflects a dedication to focused ingredient profiles, with L-Tryptophan prepared in a manner that aligns with the brand’s clear, consumer-friendly messaging.

This brand thrives in product-specific capability, providing L-Tryptophan as a single, plainly understood active ingredient that supports mood and sleep wellness concepts as described by the product profile. This alignment with a straightforward, clean formulation makes Doctor's Best a well suited for Welzo’s rigorous curation process, which is carried out by our team of medical experts and supported by our emphasis on how we verify ingredient quality.

Welzo’s selection approach prioritises brand credibility, heritage and manufacturing discipline, and we have faith in Doctor's Best to meet these criteria while delivering a product that is well suited for our audience. This partnership is bolstered by our expert evaluation process and UK regulatory familiarity, ensuring strong local market expertise.