Arginine

Arginine is a conditionally essential amino acid that serves as a direct precursor to nitric oxide (NO) — a vasodilatory molecule that relaxes blood vessels and improves blood flow to muscles. It is widely used in pre-workout supplements for the promise of increasing muscle pump and nutrient delivery. However, its oral bioavailability is limited, as much of it is degraded before reaching circulation.

• Precursor of nitric oxide — promotes vasodilation
• May improve muscle pump during training
• Cardiovascular health support
• May stimulate growth hormone release at rest
• Involved in endogenous creatine synthesis

• •People interested in cardiovascular health
• •Athletes seeking improved muscle pump
• •Individuals with mild erectile dysfunction (medical use)
• •Those seeking vasodilation and circulation support
• •Specific clinical contexts under medical guidance

3g to 6g per dose, 30 to 60 minutes before training. For cardiovascular purposes, doses of 6g to 9g per day split into 2 to 3 takes.

Arginine has an important limitation: its oral bioavailability is low because much of it is metabolized in the intestine and liver before reaching the blood. For this reason, Citrulline is considered more efficient at raising plasma arginine levels and nitric oxide production — Citrulline is converted to Arginine in the kidneys with much greater efficiency. If the goal is pump and vasodilation, Citrulline Malate is the superior choice. Arginine may be useful in specific clinical contexts, such as cardiovascular health, under medical guidance.

Studies show that oral Arginine has limited bioavailability — much of it is degraded by intestinal and hepatic arginase. Therefore, oral doses of Arginine increase plasma arginine levels less than equivalent doses of Citrulline. The evidence for sports performance improvement with isolated Arginine is weak and inconsistent. The best results appear in cardiovascular clinical contexts and at higher doses. Citrulline is currently considered the most efficient form of raising nitric oxide production via oral supplementation.

May cause gastrointestinal discomfort (nausea, diarrhea) at high doses. Not recommended for people with active herpes — Arginine may stimulate virus replication. Possible interaction with blood pressure and erectile dysfunction medications.