Ok and this article is scary as it talks about ALL synthetic vitimins such as benfotiamine and others:

FAKE VITAMIN B

In one experiment, synthetic vitamin B (thiamine) was shown to render 100% of a group of pigs sterile! 100% would be considered a significant finding. (Dr. Barnett Sure, Journ Natr 1939) Perhaps the fact that synthetic vitamin B comes from coal tar, maybe that has something to do with it, you think? Then there’s vitamin B12, which comes from activated sewage sludge. (Frost p 60) Been shooting blanks since you started on those multi’s?

For the licensed dieticians and clinical nutritionists reading this in disbelief because it is too “unscientific,” consider the way Theron Randolph MD delineated between natural and synthetic:

“A synthetically derived substance may cause a reaction in a chemically susceptible person when the same material of natural origin is tolerated, despite the two substances having identical chemical structures. The point is illustrated by the frequency of clinical reactions to synthetic vitamins – especially vitamin B1 and C – when the [same] naturally occurring vitamins are tolerated.”
- See more at: http://www.thedoctorwithin.com/vitam....HjYzfEyR.dpuf

http://www.thedoctorwithin.com/vitam...not-vitamin-c/