As DJ Delorie already pointed out in another post - If you've already
lost and you're keeping it off then it doesn't actually matter.  I'll
add
that carb counts and calorie counts have very poor accuracy but
they work anyways - It's a matter of doing your own feedback and
correction.

Without more details of exactly what tablets you're taking the
original question can't be answered.  There are brands whose
supplements don't use fillers so there's no gross carbs in them.
There are brands that use protein gel capsules so there's no
gross carbs to the holder either.  There are brands that use carb
based fillers that are insoluble fiber that add zero to the net,
brands
that use other fiber to the fillers that add calories but not carbs to
the net, brands that use statch capsules rather than gel capsules.

Only the cheapest brands have sugar coating.  If you are taking
a brand so cheap it does it costs little to move up one step in
the quality ladder.

For a long time I rolled my own assortment of supplements.  I
looked for a generic multi that listed itself as equivalent to
Theragram-M and I used type of filler as a secondary chosing
method.  With a bottle lasting half a year I'd go a year or so at a
time without any carb filler.  I'd also add various specialty items
based on family medical history trying to do prevention.  Few
of the specialty items use carb based filler.

So 1) It doesn't matter, 2) It takes detailed reading of the labels
to tell, 3) Don't be surprised that once you have read the labels
you end up thinking they contribute zero.

What do the nutrition labels tell you, including the list of ingredients
  which are ordered by weight fraction?

Question... are vitamins "burned", and for your low carb interests DO
THEY CONVERT INTO GLUCOOSE ???  If they don't convert into glucose, they
do not have the detrimental action which is alleged to the the basis of
the low carb diet.

On the one hand, your question is good.

On th other hand, perhaps you need to think about it some more. Get down
to the nitty gritty of what carbs do that make them basic to the diet,
and then ask if the supplements, such as minerals (no) and vitamins(no)
act the same way.

Your brands of vitamins may have fillers that are digestable. But
between the nutrition label and the contents label, you could be able to
answer that question yourself -- suing your research skills finely honed
as an engineer.