Read somewhere that the drugs helps and supports the mucous membranes of the lungs and its associated other organs,keeping it somewhat moist and thus making breathing easier
You will find lots of information here:
From the above link
"Vitamin A promotes healthy surface linings of the eyes and the respiratory, urinary, and intestinal tracts . When those linings break down, it becomes easier for bacteria to enter the body and cause infection. Vitamin A also helps the skin and mucous membranes function as a barrier to bacteria and viruses [9-11]."
The U.S. RDA for vitamin A is 1,000 retinol equivalents per day. (The U.S. RDA given is for adults, except pregnant or lactating women, and children over 4 years of age.)
The U.S. RDA for vitamin C is 60 milligrams per day. (The U.S. RDA given is for adults, except pregnant or lactating women, and children over 4 years of age.)
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