Jarrow Formulas L Tryptophan Veggie Capsules offer an amino acid boost that helps mood balance and restful sleep for busy days. L Tryptophan is the main active ingredient and a serotonin and melatonin precursor, helping support mood and the sleep cycle. Jarrow Formulas is a trusted brand known for science based formulas and strict quality standards. Each capsule uses vegan, non GMO fermentation derived material and is produced in a GMP certified facility. This vitamin d supplement line-up complements the mood and sleep support, and is often paired with probiotics for overall wellbeing.

Available Sizes & Variants:

60 Veggie Capsules – A convenient monthly supply for daily use.

Benefits & Features:

• Supports sleep and mood balance with the amino acid.
• The key active ingredient helps convert into serotonin and melatonin to support mood and sleep.
• Manufactured in a GMP certified facility using vegan materials, ensuring purity and consistency.
• Jarrow Formulas is trusted for science based formulations.
• Taking one capsule before bed consistently helps you establish a simple nightly routine that supports easier sleep onset and a steadier mood the next day.

Jarrow Formulas is known for science-based, transparent supplements. L Tryptophan is produced via fermentation from vegetable materials, and it's encapsulated in a vegan capsule free from common allergens. Each batch undergoes rigorous testing for quality and potency, a standard the brand consistently upholds, earning trust among shoppers who want reliable nightly support.

Other Ingredients - Vegetarian capsule (hydroxypropylmethylcellulose, water), magnesium stearate (vegetable source), cellulose and silicon dioxide.
Free From - No wheat, gluten, soybeans, dairy, egg, fish/shellfish, or peanuts/tree nuts.

• GTIN: 790011150565
• Manufacturer: Jarrow Formulas
• Categories: Best SellersJarrow FormulasNew ArrivalsSubscribe & 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.

Consume one capsule on an empty stomach 30 minutes before bedtime with water or fruit juice.

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 the neurotransmitters serotonin and melatonin, supporting normal brain function and sleep regulation.

This form is supplied in a vegan-friendly capsule and is produced via fermentation from vegetable materials, offering a clean source of this amino acid.

What Does L-Tryptophan Do?

L-Tryptophan helps maintain normal neurotransmitter balance by aiding in the production of serotonin and melatonin, which can support mood regulation and sleep processes.

EFSA and NHS guidance recognise the role of this amino acid in normal sleep and mood function; scientific research suggests that higher intake may influence sleep latency and mood in some individuals, with studies referencing serotonin pathways involved in these processes.

Dr. Silber of a UK university found that higher daily intake of L-Tryptophan was associated with improvements in sleep latency in controlled settings.

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

Dietary supplements are not a replacement for a balanced diet. Do not take more than the recommended amount. Keep in a cool, dry area away from light and heat. Ensure they are out of children's reach and view.

Jarrow Formulas is chosen for its science‑led approach to amino acids, backed by a reputation for quality and transparency. This brand operates a GMP‑certified facility and uses fermentation from vegetable materials, aligning with our rigorous manufacturing standards and commitment to purity. Their rigorous batch testing and vegan, non‑GMO, allergen‑free credentials underpin the trust we place in this partnership, and their clear emphasis on consistency across every batch supports our quality promises to customers. This brand stands out in the market for its established reputation in amino acid science and its transparent, quality‑focused manufacturing philosophy, which is why we favour it over alternatives.

Comparatively, Jarrow Formulas’ product strategy is well aligned with the needs of this supplement type, ensuring pharmaceutical‑grade L‑tryptophan capsules that suit our safety and efficacy expectations. Our medical team has evaluated this brand for compliance with the standards we enforce, and we see a strong fit for the British market given their track record and manufacturing excellence. This collaboration reflects Welzo's evidence‑based selection process our medical team and a commitment to high‑quality, reliable supplements the standards we enforce.