Applied Nutrition Leucine is a leucine amino acid supplement that helps maximise muscle protein synthesis and supports recovery after training. L leucine is the star ingredient, and the product is produced in facilities that meet GMP ISO 22000 and Halal standards. Applied Nutrition has a reputation for evidence based formulations and quality assurance that athletes trust.

Available Sizes & Variants:

160 tabs leucine tablets – Daily dose designed for easy training routine

Benefits & Features:

• Maximises muscle protein synthesis after training, and this helps recovery after tough sessions.
• Star ingredient L leucine activates the mTOR pathway to support muscle growth and recovery, making it particularly effective when taken around workouts and during periods of intense training.
• Halal certified for extra peace of mind.
• GMP and ISO 22000 aligned facilities help ensure consistent purity and safety.
• Designed for daily use by athletes, it slots neatly into warmups or post workout routines, helping you stay on track.

Applied Nutrition is a UK based sports nutrition brand known for evidence based formulations and rigorous quality standards. The leucine amino acid supplement is produced in facilities that meet GMP ISO 22000 and BRC standards and is halal certified, offering reassurance for athletes who value safety and traceability. The brand emphasises transparency and batch testing, giving you a reliable product you can trust during intense training cycles within the sports nutrition supplements category.

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.

Leucine is a crucial essential branched-chain amino acid that your body can't make and must be picked up from your diet or supplements. This blend supplies L-leucine, a amino acid used to help with muscle protein synthesis and recovery after workouts. Leucine helps to trigger the mTOR pathway, supporting muscle protein synthesis after training. Dr. Churchward-Venne at Stanford University showed that leucine can stimulate muscle protein synthesis, helping with muscle recovery after training. This mechanism helps keep lean muscle and aids recovery during intense physical activity. *This product isn't meant to diagnose, treat, cure, or prevent any disease.

Applied Nutrition is our pick for Leucine 4K since its evidence‑driven formulation style fits Welzo’s pledge to openness, safety and efficacy. The brand runs out of a recognised UK base and is famous for serving athletes with strict production norms and quality‑tested ingredients, building a solid reputation in global supplement retail. This credibility is underlined by the brand’s constant focus on compliance, openness and safety across its range, which chimes with our patient and athlete communities alike.

Applied Nutrition manufactures in facilities accredited to GMP, ISO 22000, BRC and Halal standards. Every ingredient is carefully selected and monitored through a robust quality management system to ensure purity and safety, a process that Welzo’s team documents and endorses. This is supported by third‑party testing and batch traceability, reflecting the brand’s focus on reliability and consistency. This brand was evaluated by Welzo's healthcare professionals for compliance with the standards we enforce.

For Leucine 4K, the brand delivers 4 g of L‑leucine per serving, aligning with our expectations for a potent single‑ingredient option designed to support muscle protein synthesis and recovery around training. This product fits well with Welzo’s quality criteria and our scientific assessment process, informing a trusted partnership with Applied Nutrition.