Long Covid fatigue caused by an Arginine deficiency

Arginine, Coronavirus, Health, Italy, Long Covid, Symptoms, Treatment, Vitamins

The mechanism that leads to chronic fatigue in Long Covid patients has been discovered, according to new Italian research.

“The mechanism of action that leads to the state of fatigue, or disabling exhaustion, linked to Long Covid which affects 1 in 3 people who are victims of the Sars-CoV-2 infection has been discovered: it is triggered by a deficit of arginine, an amino acid naturally produced by the body.

This is demonstrated by a study on long Covid conducted by the Agostino Gemelli IRCCS University Polyclinic Foundation – Catholic University Campus of Rome, according to which the chronic fatigue of the post-Covid syndrome is precisely associated with an alteration in the metabolism of arginine.

The new study highlighted that in patients with long Covid there is an alteration of the metabolism of arginine, which stimulates nitric oxide, a key enzyme for proper immune and vascular function.

The researchers also demonstrated that the administration of 1.6 grams of arginine and 500 mg of liposomal vitamin C for 28 days restores the metabolism of arginine to a normal level and effectively counteracts fatigue.”

Ansa.it: The mechanism that leads to chronic fatigue in Long Covid has been discovered (in Italian)


RESEARCH: Long Covid, a condition characterized by symptom and/or sign persistence following an acute COVID-19 episode, is associated with reduced physical performance and endothelial dysfunction. Supplementation of l-arginine may improve endothelial and muscle function by stimulating nitric oxide synthesis. A single-blind randomized, placebo-controlled trial was conducted in adults aged between 20 and 60 years with persistent fatigue attending a post-acute COVID-19 outpatient clinic.

Effects of l-Arginine Plus Vitamin C Supplementation on Physical Performance, Endothelial Function, and Persistent Fatigue in Adults with Long COVID: A Single-Blind Randomized Controlled Trial


Arginine is classified as a semi-essential or conditionally essential amino acid, depending on the developmental stage and health status of the individual. Preterm infants are unable to synthesize arginine internally, making the amino acid nutritionally essential for them. Most healthy people do not need to supplement with arginine because it is a component of all protein-containing foods and can be synthesized in the body from glutamine via citrulline.

Wikipedia: Arginine



US: Nearly 19 million adults may have long COVID



Image by wendy CORNIQUET from Pixabay



** This post was originally published on January 29, 2023 **