Good question, I myself use NO regular supplements!!
IMO calcium powder would be a waste on snakes, duh, they get more calcium than they need hence the large quantities of calcium in the urates.
Bene-bac is a good product for any regurge problems and I really mean to get some - one day 
IMO it's all in using good healthy feeder animals. I raise my own and I know what my feeder colony has been eating and my snake collection has been thriving on my homegrown food without any supplements for many years.
>>I was wondering what you guys use as far as vitamin supplements or regular medications. I have a lot of really nice "investment" snakes now and I just want to make sure that I am taking the very best care of them. Calcium powder and Bene-Bac Bird & Reptile Powder have both been recommended. I was just looking for some opinions of long time reptile owners!! Thanks!
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Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC and still very fiesty)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
26.49 BRB
20.21 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 

