Can Vitamin C supplements treat a cold? Out of 23,000 people The Doctors asked, 64% think this is a reality. It’s a myth! Dr. Shapiro says Vitamin C doesn’t treat or prevent colds. “That being said, if you feel Vitamin C is helping you, then take it,” says Dr. Shapiro. Dr. Batra says this is a placebo effect and Vitamin C is the number one supplement sold! “The good news is, it’s water soluble, you’re not going to get in trouble with it, not going to overdose, you’re just wasting your money!” says Dr. Ordon.