Thorne L-Arginine Plus

Every endurance athlete knows the feeling of oxygen-rich blood reaching working muscles at full capacity — the legs opening up, the lungs finding their rhythm, the effort becoming sustainable...it's smooth.

That experience hinges on nitric oxide, the molecule your blood vessels use to dilate and regulate flow. Your body makes nitric oxide from L-arginine, but the conversion is inefficient without the right cofactors.

Thorne L-Arginine Plus is built for that.

Nitric oxide dilates blood vessels, allowing more oxygen-rich blood to reach working muscles during exercise and supporting faster clearance of metabolic waste products after hard efforts. The downstream effects: improved exercise capacity, shorter recovery, better cardiovascular function.

That's what makes nitric oxide support one of the most well-researched levers in endurance performance nutrition.

Sustained-Release Delivery That Lasts 24 Hours – Most arginine supplements spike and crash within hours — not enough time for meaningful nitric oxide support across a full training day. Thorne's Time-Sorb® sustained-release technology maintains optimal arginine levels continuously when taken twice daily as directed, providing a steady substrate for nitric oxide production around the clock rather than a brief window of elevated levels.

Cofactors That Make the Conversion Actually Work – Arginine alone isn't enough. Nitric oxide synthesis in blood vessels requires specific cofactors, and L-Arginine Plus includes them: vitamin C and methylated folate (5-MTHF) directly support the enzymatic conversion of arginine to nitric oxide, while green tea phytosome, R-lipoic acid, and trans-resveratrol provide antioxidant protection for the vascular endothelium — the lining of your blood vessels where nitric oxide is produced.

Vascular Health Beyond the Workout – L-Arginine Plus supports more than in-session blood flow. By helping maintain healthy vascular elasticity, blood pressure already in the normal range, and the integrity of the vascular endothelium over time, this formula delivers long-term cardiovascular benefits that compound with consistent use — relevant for masters athletes focused on longevity as much as performance.

How to Use Thorne L-Arginine Plus

Daily Dose: Take 3 capsules two times daily, preferably with meals. The twice-daily dosing is what activates the sustained-release delivery — skipping doses breaks the continuous arginine availability the Time-Sorb® system is designed to maintain.

Consistency for Best Results: Like most vascular support supplements, L-Arginine Plus works best with consistent daily use over time. Benefits build as vascular function improves — not a one-session pre-workout product.