Source Naturals LTryptophan supports mood balance and restful sleep by giving the key amino acid that fuels serotonin and melatonin production, and the brand's strict quality controls keep purity intact, so you can feel good about what you put in your body, this time. A simple, single ingredient formula that stays true to its mix, it’s designed for daily use when you want a calm mood and a smoother night, which makes it easy to keep in your routine. Source Naturals is known for its strict quality standards and in house manufacturing, helping you trust what you put in your body, which matters to you.

Available Sizes & Variants:

30 tablets - convenient daily dose.

Benefits & Features:

• Supports mood balance for calmer days.
• Promotes restful sleep by supporting melatonin production in the evening, helping you fall asleep quicker, stay asleep longer, and wake feeling more refreshed and ready for the day.
• Designed for daily use whether you’re winding down after a busy day or supporting a steady nightly routine.
• Purity first formula with minimal additives, quickly and easily fitting into daily routines.
• Trusted brand heritage with in house manufacturing and strict quality controls.

Source Naturals has built a reputation for quality with in house manufacturing and rigorous batch testing across its extensive range of products, and this LTryptophan supplement delivers the natural amino acid your brain uses to form serotonin and melatonin, supporting mood and sleep, which is why the company emphasises purity and authenticity, keeping fillers to a minimum and checking raw materials before they reach production, so whether you’re winding down after a busy day or seeking a steadier nightly routine, it’s a straightforward, reliable no fuss option. For those seeking a vitamin d supplement to complement a holistic routine, this product also fits well as a natural sleep aid, supporting a balanced approach to rest.

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 participates in the body's normal protein synthesis and serves as a precursor to serotonin and melatonin, which help regulate mood and sleep cycles.

This single-ingredient supplement provides L-Tryptophan in its natural amino acid form, reflecting a straightforward source of the nutrient for daily use as part of a balanced diet.

What Does L-Tryptophan Do?

L-Tryptophan provides the body with a precursor that contributes to the production of serotonin and melatonin, hormones involved in mood regulation and sleep-wake cycles. Scientific discussion notes its role as part of normal brain chemistry and sleep processes.

Dr. Markus of a university found that dietary tryptophan increases brain serotonin and can positively affect mood and sleep, supporting the concept that this amino acid participates in normal physiological functioning.

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

Source Naturals is aligned with Welzo's rigorous selection criteria through its established in-house manufacturing and unwavering commitment to purity, identity and potency. The brand is recognised for strict quality standards and oversight, with over 600 products produced under one roof, which supports a transparent, tightly controlled supply chain. Their long-standing reputation in the industry and history of award-winning product excellence further reinforces trust in their manufacturing philosophy.

Source Naturals emphasises thorough quality testing, with every ingredient and finished batch subjected to advanced analytical and contaminant checks. This focus on ingredient purity and safety dovetails with our own our ingredient quality and purity standards and our vetting process, conducted by our expert team of doctors, nurses, and nutritionists.

This brand stands out against competitors by its combination of heritage, in-house quality control and transparent manufacturing practices, making them an exceptionally suitable partner for Source Naturals L-Tryptophan in the British market.