Doctor's Best L-Carnitine Fumarate with Biosint Carnitines is a plant-based supplement that supports fat metabolism and energy generation for active lifestyles. L-Carnitine fumarate helps shuttle fats into mitochondria for energy, and fumarate boosts energy generation in cellular processes. The brand embodies science-led, transparent supplementation with Biosint Carnitines made at Alfasigma in Italy.

Available Sizes & Variants:

Sixty Veggie Capsules – Everyday use with a regular monthly supply

Benefits & Features:

• Supports fat metabolism,
• Provides 500 mg of elemental L-carnitine per capsule, aligning with clinical ranges to support energy production during exercise and assist recovery after training daily life as well
• Star ingredient L-carnitine fumarate helps shuttle fats into mitochondria to fuel energy during workouts
• Biosint Carnitines are produced through an FDA-approved process in Italy, ensuring high purity and free from common allergens
• Vegan, non-GMO and free from common allergens for clean, worry-free supplementation

Doctor's Best teams up with Biosint Carnitines, with production at Alfasigma S.p.A. in Italy using a pharmaceutical grade process to ensure high purity and freedom from GMOs and common allergens. This science-led approach reflects the brand's long standing commitment to transparent sourcing and rigorous quality. The star ingredient is L-carnitine fumarate, which helps transport fatty acids into mitochondria for energy, while fumarate participates in the Krebs cycle to boost cellular energy. For those seeking a vitamin d supplement alongside their routine, this formula pairs well with broad nutritional support, and athletes may also benefit from creatine as part of a balanced regime.

Other Ingredients - Modified cellulose (vegetarian capsule), magnesium stearate (vegetable source), silicon dioxide.
Free From - Gluten Free, Soy Free

• GTIN: 753950001060
• Manufacturer: Doctor's Best
• Categories: Acetyl-L-Carnitine SupplementsCHECKOUT UPSELLDoctor's BestNew ArrivalsStamina & Endurance 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 each day, with or without meals, or as advised by a knowledgeable healthcare provider.

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

The Active Ingredient Is: L-Carnitine (Fumarate Form)

L-Carnitine is an amino acid-like compound that plays a role in fat metabolism and energy production within cells. This formulation uses fumarate to support cellular energy pathways. The product employs Biosint Carnitines to provide a vegan, high-purity form of L-Carnitine fumarate.

This form is designed to be vegan and non-GMO, with a pharmaceutical-grade production process that emphasises purity and safety.

What Does L-Carnitine Do?

L-Carnitine participates in transporting long-chain fatty acids into mitochondria, where they can be used to generate energy. Fumarate functions as an intermediate in the Krebs cycle, contributing to cellular energy production. Dr. Stephens of the University notes these roles in energy metabolism.

EFSA-aligned understanding recognises energy metabolism and mitochondrial function as central to normal physiology.

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.

Doctor's Best is recognised globally for science-based nutritional supplements, with a reputation built on ingredient transparency and robust third-party validation. This brand collaborates with advanced sourcing partners such as Alfasigma and Biosint to deliver carnitine formulations, reflecting a commitment to quality from the supply chain to the final product. Our evaluation team, including our team of medical experts, compared manufacturing discipline, provenance, and certifications across leading brands, and Doctor's Best stood out for its consistent, evidence-driven approach and long-standing industry standing. The manufacturer’s facility in Italy uses a pharmaceutical-grade, FDA-approved process, ensuring high purity and safety, while affirming vegan, non-GMO, gluten-free and soy-free certifications via independent verification. For ongoing assurance, we rely on our ingredient quality and purity standards as part of our vetting. This alignment makes Doctor's Best a natural fit for this L-Carnitine Fumarate product, delivering synergy between brand strength and product needs.