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Age of the dragon is pretty critical when considering this question.
Young dragons grow really fast and need a lot of calcium and d3 to keep up with the growth rate. At times, some of my dragons have grown an inch in a week! Most of the time it's like an inch every 2-3 weeks.
It also depends on lighting and temperature and natural sunlight availability.
A more direct answer to your concern though- I've been breeding dragons since 1994, and I have gone many generations and thousands of offspring with mine in that time. My oldest dragon is around 12 years old possibly a year or two older. I dust all insects with rep-cal with d3 when the lizards are indoors. Outdoors I use calcium without d3. My adults are only fed relatively few insects- I mostly use rep-cal pellets ever since they became available years ago and those have worked great for me for adults. I do feed adults greens as well as the pellets. I rarely feed insects to adults except as treats. So the adults really don't get supplementation- just pellets and a variety of greens. I feed all the insects growing dragons can eat every day, as well as pellets and greens to babies until they are about 15", when I switch them off the insects. This takes several months of growth. During that time they get lots of rep-cal with d3.
If the dragon is young and growing I would strongly advise keeping up with the d3. I've seen a number of problems when there is lack of d3 and no problems from too much d3 over the years. That's not to say it can't happen, only that it is much more rare than the opposite problem of not enough...
edit-- re: veggie dragons. Over the years I've done a lot of messing around with various feeding trials for my dragons. I actually went from egg to adults laying good eggs on a strictly vegetarian diet one time. It can be done. But they grew slowly and never got quite as large and were not as productive (smaller clutches). Also babies had to be reared seperately to avoid cannibalism. But they got along great as adults and the eggs they produced and the hatchlings from those eggs were very healthy.
One study of wild dragons showed they consumed 90% plant matter as adults. Hardly anyone feeds them that way in captivity...