NOW Foods L-Carnitine 500 mg Veg Capsules (Carnipure®)

Power your cellular metabolism with NOW Foods L-Carnitine 500 mg, featuring world-renowned Carnipure® L-Carnitine Tartrate. L-Carnitine is an essential, biologically active nutrient that acts as a molecular transport shuttle, carrying long-chain fatty acids straight into your cellular "power plants" (the mitochondria). Once inside, your body oxidizes these fats to generate adenosine triphosphate (ATP)—the fundamental currency of cellular energy.

Whether you are an endurance runner striving to spare glycogen, an athlete fighting exercise-induced muscle soreness, or seeking daily cardiovascular and metabolic support, this pharmaceutical-grade, non-animal formulation delivers clinically verified potency in clean vegetarian capsules.

• ✓500 mg Pure L-Carnitine: Standardized from 746 mg of high-stability L-Carnitine Tartrate (Carnipure®) per single capsule.
• ✓Cellular Fat Burning: Shuttles long-chain fatty acids across mitochondrial membranes to fuel ATP synthesis.
• ✓Enhanced Exercise Recovery: Clinically shown to blunt post-exercise muscle tissue breakdown and accelerate recuperation.
• ✓100% Pure L-Form: Zero synthetic D-Carnitine optical isomers, ensuring zero biological receptor competition.
• ✓Non-GMO & Vegan: Free of animal-derived gelatins, gluten, dairy, wheat, soy, and synthetic preservatives.

How L-Carnitine Works: The Mitochondrial "Carnitine Shuttle"

To appreciate how L-Carnitine fuels physical energy, it helps to look inside your muscle and heart cells. Your body breaks down dietary fats and stored adipose tissue into long-chain fatty acids. However, the inner mitochondrial membrane is strictly impermeable to these fats. Without a dedicated chemical chaperone, fatty acids cannot enter the furnace to be burned for fuel.

This is where the Carnitine Shuttle operates through a four-stage biochemical cascade:

1. Esterification (CPT-1): On the outer mitochondrial boundary, the enzyme Carnitine Palmitoyltransferase-1 (CPT-1) links free L-carnitine to long-chain acyl-CoA, generating acylcarnitine (Longo et al., Am J Med Genet C Semin Med Genet, 2006).
2. Membrane Translocation (CACT): A dedicated transport protein known as Carnitine-Acylcarnitine Translocase (CACT) moves acylcarnitine directly across the inner membrane barrier into the mitochondrial matrix.
3. Regeneration & Beta-Oxidation (CPT-2): The inner enzyme Carnitine Palmitoyltransferase-2 (CPT-2) strips the fatty acid away from the carnitine, transferring it back to coenzyme A. The freed fatty acid undergoes beta-oxidation, producing acetyl-CoA that directly feeds the Krebs Cycle and oxidative phosphorylation to synthesize ATP.
4. Cytoplasmic Recycling: CACT shuttles the free L-carnitine molecule back to the outside cytoplasm, ready to ferry the next fatty acid into the furnace.

Clinical Recovery Evidence: In double-blind, placebo-controlled human clinical trials, supplementary L-Carnitine Tartrate significantly mitigated post-workout muscle micro-damage, reduced plasma creatine kinase (CK) and lactate dehydrogenase (LDH) levels, and decreased perceived muscle soreness in both men and women (Fielding et al., Nutrients, 2018, PMID: 29534031; Stefan et al., Nutrients, 2021, PMID: 34684429).

Complete Supplement Facts & Ingredient Profile

Pure L-carnitine in its free-form base is highly hygroscopic, meaning it aggressively pulls water molecules from ambient air and degrades quickly into a liquid paste. NOW Foods prevents this natural degradation by using Carnipure® L-Carnitine Tartrate—a patented, crystalline complex of pure L-carnitine stabilized with food-grade L-tartaric acid. This maintains full potency, maximum stability, and swift gastrointestinal release.

* Daily Value (DV) not established.

Other Ingredients: Hypromellose (cellulose capsule), Microcrystalline Cellulose, Magnesium Stearate (vegetable source), Silicon Dioxide.

Allergen & Formulation Statement: Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut, or sesame ingredients. Produced in a GMP-certified facility that processes other ingredients containing these allergens. Certified Kosher (Triangle K) and Halal (Crescent H). Suitable for vegetarians and vegans.

NOW Quality Standards: In-House Lab Testing & Contaminant Screening

Not all carnitine supplements on the commercial market are equal. Cheap, low-grade imports often suffer from industrial solvent contamination, sub-potent fills, and dangerous isomeric mixtures. NOW Foods maintains one of the most comprehensive analytical laboratory testing systems in the natural products industry, performing over 31,000 separate quality tests each month across raw materials and finished goods.

NOW’s analytical and microbiological facilities hold independent ISO/IEC 17025:2017 accreditation through A2LA, ensuring analytical precision across critical testing parameters:

• 1. Chiral Chromatography & Optical Purity (Eliminating D-Carnitine): Carnitine has two mirror-image optical isomers: L-carnitine and D-carnitine. Synthetic production methods that cut corners can create racemic mixtures containing D-carnitine. D-carnitine is not only biologically useless, but it actively competes with and blocks your body’s natural OCTN2 carnitine transporters, triggering muscular weakness and myasthenia-like symptoms. Using High-Performance Liquid Chromatography (HPLC) and polarimetry, NOW verifies that every batch contains 100% active, bio-identical L-carnitine with zero detectable D-isomers.
• 2. Heavy Metals Screening via ICP-MS: Raw materials are tested via Inductively Coupled Plasma Mass Spectrometry (ICP-MS) capable of detecting contaminants down to parts-per-billion (ppb). Strict limits are enforced for Lead (<0.5 ppm), Arsenic, Cadmium, and Mercury, easily satisfying both USP standards and California Proposition 65 thresholds.
• 3. Microbiological Pathogen Screening: Every lot is screened via automated qPCR and USP plate methods to guarantee zero presence of Salmonella spp., Escherichia coli, and Staphylococcus aureus, alongside strict caps on yeast and mold counts.
• 4. Residual Solvent Testing: Gas Chromatography (GC-FID/MS) screens raw powders to confirm that zero toxic extraction chemicals, volatile organic compounds, or industrial solvents remain in the final capsule.

Usage Guidelines, Daily Timing & Medical Precautions

Suggested Usage: As a dietary supplement, take 1 veg capsule 1 to 3 times daily.

Optimal Timing Strategies:

• For Athletic Performance & Endurance: Take 1 to 2 capsules 30 to 45 minutes prior to aerobic exercise or weight training to support fatty acid oxidation during exertion.
• For Muscle Recovery: Take 1 capsule with your post-workout meal or shake. Clinical research shows that modest elevations in insulin (stimulated by dietary carbohydrates or protein) enhance muscle carnitine uptake via the sodium-dependent transporter OCTN2.
• For General Metabolic Support: Take 1 capsule in the morning and 1 capsule in the early afternoon between meals with a glass of water.

Important Safety & Contraindication Information:

• Adults Only: For adult use only. Keep out of reach of children.
• Thyroid Hormone Interaction: L-Carnitine acts as a peripheral antagonist to thyroid hormone action by inhibiting both triiodothyronine (T3) and thyroxine (T4) entry into human cell nuclei (Benvenga et al., Ann N Y Acad Sci, 2004, PMID: 15591013). Individuals with hypothyroidism or those taking prescription levothyroxine or thyroid replacement therapy should consult their physician before using carnitine supplements.
• Seizure Disorders: High supplemental doses of carnitine have been reported to increase seizure frequency or lower seizure thresholds in individuals with pre-existing seizure disorders.
• Pregnancy & Nursing: If pregnant, nursing, taking prescription anticoagulants, or under care for a serious medical condition, consult your physician before use.
• Storage Note: Store in a cool, dry place after opening. L-carnitine tartrate capsules should be kept tightly capped to shield the crystalline powder from ambient moisture.

Why Order NOW L-Carnitine From VitaNet?

VitaNet®, LLC is an independent, family-owned discount retailer providing premium vitamins and nutritional supplements online since 1995[cite: 1]. With over 31 years of hands-on industry experience, we understand the critical difference between verified, manufacturer-direct freshness and products stored in unmonitored mass-market fulfillment warehouses[cite: 1].

• ✓100% Unconditional Money-Back Guarantee: We stand behind every bottle we sell. If you are not completely satisfied, we provide a full refund and even pay the return shipping costs—even on opened items[cite: 1].
• ✓Direct Warehouse Storage: Because L-carnitine attracts moisture, our inventory is housed in dedicated climate-controlled facilities in Hartville, Ohio, guaranteeing zero heat degradation or capsule clumping[cite: 1].
• ✓Guaranteed Authentic NOW Foods Inventory: We source directly through verified distribution networks, ensuring you receive genuine, sealed Carnipure® product with verified lot codes and expiration dates.
• ✓Better Business Bureau A+ Accreditation: VitaNet maintains an A+ rating with the Better Business Bureau, reflecting over three decades of trusted customer care, honest pricing, and prompt shipping[cite: 1].

Frequently Asked Questions (FAQ)

What is the difference between L-Carnitine and Acetyl L-Carnitine (ALCAR)?

While both compounds provide carnitine, they serve distinct bodily functions. Standard L-Carnitine (and L-Carnitine Tartrate) primarily concentrates in muscle and cardiac tissues, where it is used to shuttle fatty acids into mitochondria for physical energy and workout recovery. Acetyl L-Carnitine (ALCAR) features an attached acetyl group that enables it to cross the blood-brain barrier efficiently, where it supports brain mitochondrial health, neurotransmitter synthesis (acetylcholine), and cognitive focus.