Taking the Glycine amino acid, as athletes do, can prevent and fight viruses:
That amino acid which was considered as non essential, is now considered as essential. Vitamin C (ascorbic acid) which is also mentioned has antiviral properties as well.
I have been taking 2 grams of Vitamin C as a supplement daily for over 40 years. This article would explain why I haven't caught the flu for all that period. I very seldom catch a cold as well and as a matter of fact, I don't remember when was the last time I was subjected to this viral illness.
Another interesting benefit with this amino acid is that it can help someone who has trouble with his/her sleep. Last week I started taking 1 gram of it daily, 500 mg ½ hour before going to bed. Since then, my intelligent Withings watch has started indicating that my deep sleep percentage now exceeds 50% of all my recent night sleep periods.
In the above mentioned technical article, you will read that this amino acid is also involved in the collagen synthesis. The worsening of the mechanical system due to the deterioration of collagen will affect not only cartilage, bone, tendons, ligaments, etc., but the entire connective system of the extracellular matrix that is found in all tissues.