What brand of vitamin c doesn't have bioflavonoids?

Why? Likely few/none: Like all vitamins, single molecules found in stuff from nature which humans have long eaten & not maintained every single gene to manufacture out of other molecules (typically missing only 1 of many steps), vitamin C is routinely harvested in association with dominant other molecules, e.g. from fruit waste in industrial processing. Look up issues on http://en.wikipedia.org Flavonoid & Vitamin C.