BioTechUSA L-Tryptophan is a mood and sleep support supplement that helps balance mood, promotes calmer evenings, and improves sleep quality for a refreshed morning. Each capsule provides 500 mg of L-tryptophan, the main ingredient, backing the intended effects. BioTechUSA stands for clear, single ingredient focus and tight quality standards. That helps you take it confidently before bed.

Available Sizes & Variants:

60 capsules - convenient nightly dose.

Benefits & Features:

• Supports mood balance for steadier days.
• Promotes calmer evenings and easier wind down before bed, supporting restful nights.
• The star ingredient, L-tryptophan, is delivered at a clinically relevant dose per serving.
• Suitable for nightly use as part of a calming bedtime routine.
• Manufactured to strict quality standards with robust ingredient sourcing and careful capsule integrity, this product meets BioTechUSA's reputation for clear, reliable supplements trusted by customers worldwide.

BioTechUSA's L-Tryptophan line reflects a focus on purity and precise dosing, with each capsule delivering 500 mg of L-tryptophan sourced to support a calm mood and restful nights. The product aligns with clinical dosing patterns seen in sleep and mood research and is packaged in a straightforward capsule format for daily use. The brand's approach emphasises rigorous quality controls and transparent ingredient lists, setting it apart in a crowded market. While the product isn't a vitamin d supplement, many users pair it with other wellness staples like n acetylcysteine or other supplements as part of their routine.

L-Tryptophan 42%, bulking agent (calcium phosphates), capsule shell [gelatine, glazing agent (shellac), colour (iron oxides and hydroxides), acidity regulator (ammonium hydroxide), acidity regulator (potassium hydroxide)], anti-caking agents (magnesium salts of fatty acids, silicone dioxide).

• GTIN: 5999076236565
• Manufacturer: BioTechUSA
• Categories: BioTechUSA SupplementsSports SupplementsTryptophan
• 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 with a glass of water one hour before bedtime. Store in a cool, dry place, out of reach of children. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Not recommended for people with medical conditions and/or taking medications.

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 serotonin and melatonin, helping to regulate mood and sleep related processes.

This product is pure L-Tryptophan offered in capsule-ready form, giving a single-ingredient profile for clarity and purity.

What Does L-Tryptophan Do?

L-Tryptophan helps with neurotransmitter synthesis, supporting emotional balance and sleep quality through its role in serotonin and melatonin production.

It helps regulate sleep-wake cycles and mood, aligning with everyday wellness and the body's natural daily rhythms.

This product isn't meant to diagnose, treat, cure or prevent any disease.

BioTechUSA sticks out in our review for its ingredient-led focus on L-Tryptophan. This brand leans into a simple formulation, delivering 500 mg of pure L-tryptophan per capsule and keeping non-active ingredients minimal, which fits Welzo’s preference for transparency and simplicity in supplementation.

Our team checked BioTechUSA against firm quality standards and confirmed a clear product profile that centers on the main active ingredient, which helps with consistent dosing and user experience. For those looking for peace of mind on quality practices, this brand is evaluated by our team of medical experts for compliance with our supplement quality standards, helping ensure you receive a product that matches Welzo’s care norms.

We picked BioTechUSA for this supplement because it really matches Welzo’s brand checks, product focus, and commitment to delivering a clean, dependable L-Tryptophan option that sits well within our mood and sleep support range.