>Dave  , do you have any measured amount and do you have a source you  have found to get a bulk amount 

Ascorbic acid can be bought by the kilogram, old numbers ~$20/kg
Measured amount depends on circumstance. (ie how bad is the ccd AT THIS POINT)
I'd say range is 10-20gm/hive/yr, maybe more if wintering in south (?20-30gm?)
I have not ever fed more than 2.5 gm at one time (usually 1+ gm/hive)
Mostly fed via top bar drench, 10 gm/litre, 6-10 hives/l

>and the bees seem to prefer syrup with it in

My impression is  that bees also seem to prefer VC
I had planned a test, life intervened and it fell by the wayside

dave

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