I think I read Vitamin C is meant to help too, I forgot to buy that. I do take a multivitamin but I might get a higher dose of Vitamin C too. I wish you could get a vegan version of the soluble Vitamin C. I've never seen one... I'm off to look.
SD does a chewable one that doesn't contain gelatine. I buy their multi vitamin/mineral ones and get 3 for 2.