Best Vit C
This is the only Vit C to buy. It's easy on your stomach and readily absorbable. Don't buy chewables. They contain a form of sugar which defeats the purpose of taking Vit C when you are coming down with a cold or flu (I take 1 every 4 hrs then). My old GP said Vit C strengthens your immune system. I tell my friends and family that when you're already sick, take Ester C every 4hrs but take Vit D3 and Zinc too. I take one a day to keep me well. I'm a retired nurse.