L-Tryptophan is a mood and sleep support supplement that helps keep mood steady and sleep restful by backing serotonin production. As the brain's only precursor to serotonin, tryptophan helps support mood, sleep quality, and cognitive function. Lidtke is known for pharmaceutical-grade ingredients and clear quality standards, built on years of experience in safe, effective supplements.

Available Sizes & Variants:

180 capsules - suitable for daily use

Benefits & Features:

• Supports mood by boosting serotonin production.
• Promotes restful sleep by supporting serotonin-derived melatonin, helping you wind down naturally and wake refreshed after a calm, restorative night.
• The key active ingredient acts as the brain's serotonin precursor, influencing mood, behaviour, and cognition for a steadier day and clearer thinking.
• Designed for daily use as part of a simple wellness routine, with pharmaceutical-grade quality you can trust.
• Lidtke's rigorous sourcing and manufacturing standards underpin purity and consistency, making this tryptophan supplement a straightforward option for those seeking reliable mood and sleep support without a complicated routine.

From its beginnings, Lidtke has focused on purity and transparency, using pharmaceutical-grade tryptophan sourced for consistency. The capsules are produced in a facility that adheres to strict quality standards and tested for purity. The star ingredient is the brain serotonin precursor, underpinning mood, sleep, and cognition. This product sits well in a complete wellness routine and can be paired with a vitamin d supplement or n acetylcysteine when advised by your clinician.

L-Tryptophan

• GTIN: 630610003742
• Manufacturer: Lidtke
• Categories: LidtkeNew ArrivalsTryptophan 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 one capsule daily or follow your healthcare provider's instructions. One capsule taken with a main meal\, up to a maximum of three per day\, or as professionally directed.

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 the body can't manufacture and must be got from the diet or supplements. This pharmaceutical-grade form is used as a pure, single-ingredient ingredient in this product.

As the main precursor to serotonin in the brain, tryptophan supports normal brain biochemistry linked to mood and sleep processes. It is described in research as a foundational amino acid for serotonin synthesis and broader brain function.

What Does L-Tryptophan Do?

L-Tryptophan helps with serotonin production, which is involved in regulating mood and sleep as part of normal body function. NHS and EFSA guidance recognise tryptophan as a contributor to these everyday bodily processes.

Scientific research suggests that tryptophan influences mood and sleep through serotonin synthesis, reflecting its role in everyday neurological and cognitive function. This supports general wellbeing without implying disease outcomes.

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

This brand's reputation for pharmaceutical-grade L-Tryptophan immediately set the standard for quality in this category. Lidtke is recognised in the industry for delivering single-ingredient supplements in a highly purified form, which aligns with Welzo’s commitment to potency and transparency. Our medical team thoroughly evaluated the brand’s approach to product accuracy and consistency, and the findings supported a confident partnership decision. This is reflected in the emphasis on rigorous formulation practices and traceable sourcing that many practitioners value.

Welzo selected Lidtke after our team assessed their manufacturing ethos and quality controls against our criteria. This brand’s alignment with our quality assurance criteria is reinforced by their overall positioning as a specialist in pharmaceutical-grade ingredients, ensuring reliability in everyday use. For additional context, this partnership is grounded in our expert evaluation process, with decisions supported by our in-house team and the broader quality standards framework.

Ultimately, Lidtke is well suited for producing L-Tryptophan capsules thanks to its focus on purity, consistency, and clear formulation standards, making it a fitting match for this supplement and for Welzo’s trusted catalog. For more on our evaluation, see how we validate quality with our medical team and our quality assurance criteria.

Further details on our vetting process can be explored through our medical team and our quality assurance criteria.