Haven't used vita lites for soooooo many years! Didn't even know they still made them!
In addition to the extra calcium and exposure to the UVB you need to make sure the temperatures are right so the chameleon can digest the food properly thus absorb he nutrients, feed / gutload the insects properly and use the supplements needed to make up for its captive diet.
You can feed / gutload the insects with a wide assortment of greens such as collards, escarole, endive, dandelion greens, kale, etc and veggies such as carrots, sweet red pepper, squash, zucchini, sweet potato, etc.
The feeder insects we use have a poor ratio of calcium to phosphorous so we recommend that you dust them just before feeding them to the chameleon with a phosphorous - free calcium powder at most feedings to make up for it.
We recommend dusting twice a month with a phosphorous - free calcium / D3 powder to ensure that the chameleon gets some D3 without overdosing it and leaving the chameleon to produce the rest of the D3 from its exposure to the UVB light. D3 from supplements can build up in the system and lead to overdoses but D3 from exposure to UVB won't likely build up as long as the chameleon can move in and out of the UVB when it wants to.
We also recommend that you dust twice a month with a vitamin powder that contains a beta carotene ( prOformed ) source of vitamin A. PrOformed sources of vitamin A cannot build up in the system and lead to overdoses so this leaves it up to you to decide whether the chameleon needs prEformed vitamin A or not.
Good luck with its recovery.