The normal supplement schedule for chameleons is:
Calcium at nearly every feeding
Multivitamin twice a month (every other week)
Calcium with D3 twice a month (every other week)
Adults get fed every other day
This is most applicable to panther and veiled chameleons. Jackson chameleons are more montane species, which means they tend to metabolize things a little differently as a category with similar other species. The people who have kept jacksons a long time recommend a slightly reduced supplementation schedule as montanes, like jacksons, tend to have problems with oversupplementation more easily than veileds and panthers.
My schedule for my jackson:
Calcium nearly every feeding
Multivitamin once a month
Calcium with D3 once a month (or not at all if he gets at least several days of unfiltered sunlight)
Yours looks to be young adult (around a year or so) so he can be fed 3-5 crickets every other day.
You don't want to use D3 so often because it can cause toxicity and damage to the kidneys over time. There are calcium supplements that do not have D3 or phosphorus - that's the one you want for regular use. You may have to order it online as some petstores just don't carry it. Using a multivitamin too much can also lead to buildup of some vitamins, and in this case it's not "the more the better". Too much can cause toxicity issues. Calcium is the only one that can (and should) be given very often as they need large amounts of calcium for good health.
While the petstore guys often have good intentions they have almost no training. And what training they do have is really basic info, usually most applicable to iguanas and bearded dragons. They extrapolate what they know from that to all species, which is very flawed. Chameleons in particular are very unique and have unique care needs that are don't fit with basic reptile knowledge. So it's not that he lied to you, he just didn't know any better.
" if you have any other questions you can PM me.
