Hi, I replied previously but accidentally deleted it when I tried to edit. So here goes a second time. Vitamin A with Vitamin C is good for chest infections. Vitamin A helps fight infections and is particularly good for the mucus membranes of the chest. I first saw this information in a book "Give Asthma the Big A" by Marion Shepherd-Slee. Vitamin A (as a fat soluble vitamin) can be toxic so I was loathe to try it until I had a flu which was difficult to get rid of and severely worsened the asthma. I took 2 Vit.A (2x 5000 iu) and 2 Vit. C (2x 500mg) in the afternoon and the same dose again that night. I woke up the next morning with hardly any sign of the flu or the asthma. After another 24 hrs ( 4 doses) there was no sign of it. <strong>Different people react differently to Vitamin A. Some people can get a </strong><span style="text-decoration: underline;">toxic dose</span> at 15 000- 20 000 iu while others can take 50 000- 100 000 iu over a short term with no ill effects. One initial sign of toxicity is a severe headache. Just stop the Vitamin A and it should go away. <span style="text-decoration: underline;">DO NOT TAKE VITAMIN A IF YOU ARE PREGNANT AS IT CAN CAUSE BIRTH DEFECTS.</span> I now use Vitamin A,C and E (only 2 tablets of E a day) to control any chest infections. Unfortunately recently I came down suddenly with a severe viral chest infection and did not maintain my usual dosage. It was the worse congestion I had ever had ( and I have had Pneumonia) with very sticky phelgm. Intravenous Vitamin C had helped me with a case of cellulosis so I decided to give it a try here. I noticed that it helped but seemed to wear off after a 6-15 hours. I then went on to have 30 grams intravenous every day and sometimes every second day. I also upped my Vitamin A and oral Vitamin C. It was the only thing that seemed to help me. Gradually I improved and am almost well. <strong>High doses of intravenous Vitamin C can lower your copper levels which can affect arthitis and certain hormones so you might like to tke a tablet of copper if you are on intravenous C for any length of time.</strong> I had tried antibiotics but they had not helped. In New Zealand a man was in a coma with Swine Flu and recovered after being given intravenous Vitamin C (Google - New Zealand, swine flu and Vitamin C - very interesting). Good Luck with your health!