Ingredient Science

L-Citrulline and Healthy Blood Flow

By Horsefil Research Team · Reviewed by Dr. Gregory Marsh, M.D. · Updated June 2026

L-Citrulline is one of the most studied amino acids for circulation support — and a key ingredient in Horsefil. Here's why it matters.

What Is L-Citrulline?

L-Citrulline is an amino acid the body converts into nitric oxide, supporting healthy blood flow already within normal levels.

Why Healthy Circulation Matters

Good circulation plays a role in delivering oxygen and nutrients throughout the body, which can contribute to energy levels and physical performance.

Widely Studied in Exercise Science

L-Citrulline has been widely studied in the context of exercise performance and cardiovascular health.

L-Citrulline in Horsefil

Horsefil includes L-Citrulline as a core circulation-support ingredient — see the ingredients page and the current Horsefil discount on the Horsefil official website.

L-Citrulline supports healthy circulation and is not a treatment for any condition. Consult your doctor before use, especially if you take blood pressure medication.

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