What I do for my chameleons is stick to this schedule
mondays - calcium w/o D3
tuesdays - calcium w/o D3
wednesdays - no supplements/ no food 2x a month
thursdays - calcium w/o D3
fridays - calcium w/o D3
saturdays - no food
sundays - herptevite every other week/ calcium with D3 once a month
that's just my schedule and it has worked great for my chameleons so far..
I could be doing it all wrong though haha.. but my chams seem fine.
Also a good thing to use to gutload your crickets and other pet feeders are turnip greens, romaine lettuce, yellow squash, carrots, and apples, sometimes oranges as well.