L-Tyrosine is a dietary supplement that boosts cognitive function and stress resilience by supplying an essential precursor for neurotransmitters and thyroid hormones. The star ingredient is L-tyrosine in its unbound form, studied by Dr Deijen from the University of Groningen, who found it helps sustain focus and mental clarity, even under pressure. Klaire Labs supports this hypoallergenic, professional grade supplement with strict GMP standards and third party quality certifications.

Available Sizes & Variants:

100 capsules - convenient daily supply.

Benefits & Features:

• Supports everyday focus and mental clarity during demanding moments.
• Key ingredient L-tyrosine serves as a direct precursor to dopamine, norepinephrine, and epinephrine, supporting focus, mood regulation, and a steadier response to stress day by day.
• Vet-grade controls and hypoallergenic capsules keep this suitable for sensitive users.
• Clinical research supports 500–2000 mg daily ranges for cognitive and stress resilience, and benefits are most evident when taken before demanding tasks in real world settings.
• Made under strict GMP standards to ensure purity and potency.

From Klaire Labs, L-Tyrosine arrives in a vegetarian capsule with free form L-tyrosine, emphasising a clean label and hypoallergenic formulation. The product is manufactured under strict GMP and carries third party quality certifications, underscoring safety and potency you can trust. Sourcing is guided by pharmaceutical grade standards and transparent labelling, with USP grade ingredients and a commitment to purity. For a broader daily routine, some users pair this with a vitamin d supplement, or explore stacks including creatine or n acetylcysteine.

(other) Vegetarian capsule (hydroxypropyl methylcellulose, water), L-leucine, microcrystalline cellulose, and silicon dioxide.

• GTIN: 828054010529
• Manufacturer: Klaire Labs
• Categories: Klaire LabsL-TyrosineNew ArrivalsPopular Supplement Brands
• 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 1 capsule, up to 4 times a day, or follow your healthcare professional's instructions. Take 1 capsule\, 1 to 6 times daily with meals or as directed by a healthcare professional.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: L-Tyrosine (Free Form)

L-Tyrosine is an amino acid that the body uses to make certain neurotransmitters and thyroid hormones, helping support normal brain and metabolic function.

This professional-grade supplement uses USP-grade L-tyrosine in a hypoallergenic vegetarian capsule and comes with a clean label, free from common allergens and artificial additives.

What Does L-Tyrosine Do?

L-Tyrosine is involved in the synthesis of dopamine, norepinephrine and epinephrine, and supports the production of thyroid hormones which help regulate energy and metabolism.

This follows EFSA-style wording for nutrient function and is backed by research on cognitive performance under stress.

Dr. Deijen from the University of Groningen found that tyrosine may help maintain cognitive performance in demanding situations, reflecting its role in brain chemistry and stress response.

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

Why Klaire Labs L-Tyrosine is Welzo Selected

Welzo’s partnership criteria focus on strong brand credibility, manufacturing excellence and transparent quality, and Klaire Labs clearly matches this standard. When comparing brands, Klaire Labs stands out for its professional-grade approach to hypoallergenic supplementation and pharmaceutical-style quality control, supported by third-party quality certifications and GMP-compliant processes. The brand’s reputation for strict ingredient verification and transparent labelling reinforces our confidence in its reliability for this specific supplement.

In terms of brand-specific quality, Klaire Labs employs premium USP-grade L-Tyrosine in a hypoallergenic, clean-label formulation, with clear attention to safety and potency. This aligns with our commitment to rigorous testing and certifications, which you can learn more about through our rigorous testing protocols and by exploring the work of our expert team of doctors, nurses, and nutritionists.

The product fit is particularly strong for L-Tyrosine, a direct precursor to neurotransmitters and thyroid hormones, and Klaire Labs’ professional-grade, transparent approach makes it a natural choice for Welzo. This brand’s established manufacturing standards and commitment to purity distinguish it from competitors, and our expert team evaluated Klaire Labs against our strict brand criteria to confirm its suitability for this supplement.