Yes, bioflavanoids are very effective and have been using them for the majority of my treatment. I get vitamin C with bioflavanoids and there is a lot of good properties about flavanoids. One benefit is that they are anti-allergy, so they actually help heal your allergies. Dr. Mcoombs puts them in his products as well and has talked about their properties on some radio shows.
You can purchase them seperately as well.