Source Naturals L-Tryptophan with Coenzyme B6 supports restful sleep and a calmer mood by boosting serotonin production, and helps you feel more at ease and sleep more soundly. The blend teams L-Tryptophan with coenzyme B6 to help serotonin and melatonin form, and Source Naturals' dedication to purity and routine testing guarantees a top notch supplement.

Available Sizes & Variants:

60 Tablets – handy daily amount for a month.

Benefits & Features:

• Encourages a relaxed mood.
• Helps sleep quality by aiding the body's tryptophan to serotonin conversion.
• Provides a gentle daily support for mood and rest by pairing L-Tryptophan with coenzyme B6, which helps convert tryptophan into serotonin and melatonin, supporting emotional balance and smoother nights.
• Calcium offers a small assist with absorption and general nervous system function.
• Designed for daily use, helping calm focus and restful evenings when dietary tryptophan is limited.

Source Naturals has earned a reputation for purity and rigorous quality checks, with L-Tryptophan described as extremely pure and regularly tested to ensure high standards. The formula uses coenzyme B6 to help convert tryptophan into serotonin and melatonin, supporting mood and restful sleep as part of a daily routine. This heritage in scientific formulation underpins products you can trust for everyday wellbeing.

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.

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 serves as a precursor to important brain chemicals involved in mood and sleep regulation.

This form combines L-Tryptophan with coenzyme B6 to support the body’s conversion processes, aiding the production of serotonin and melatonin from tryptophan.

What Does L-Tryptophan Do?

L-Tryptophan helps support the production of serotonin and melatonin, substances linked with mood regulation and sleep quality. Vitamin B6 in this formulation assists the conversion of tryptophan into these signalling compounds, aligning with known nutrient pathways for neurotransmitter synthesis.

Evidence suggests these pathways contribute to normal mood and sleep processes, with the coenzyme B6 supporting the conversion and utilisation of tryptophan.

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

Source Naturals is a benchmark in quality and consistency, with a long-standing reputation for dependable sourcing and rigorous quality controls that align with Welzo’s commitment to excellence. This brand’s manufacturing philosophy emphasises purity and reliability, underscored by their regular quality testing and purity screening to ensure extremely pure ingredients. This level of care translates into consistent, well‑documented product profiles that our medical team trusts for real‑world use. For Welzo, this is a clear demonstration of third‑party validation in practice, backed by the brand’s emphasis on rigorous internal standards and transparent quality practices. We evaluated this partnership with Welzo's healthcare professionals to ensure alignment with our ingredient‑quality criteria and safety expectations, and they confirmed Source Naturals meets our high bar for purity and consistency as part of how we verify ingredient quality. Welzo's healthcare professionals continue to oversee this collaboration. how we verify ingredient quality.