Like Lovereps, I have been using the Reptivite (the formula without D3) with montanes. So far, I haven't seen any problems using it (dusting feeders once or twice a month, depending on the particular animal). Personally, I wouldn't use Repashy's vitamin A supplement unless I was sure the chameleon was vitamin A deficient. The product itself indicates that it is recommended only in certain situations. I've also used Repashy's Calcium Plus because it has a small amount of preformed A, even though it has vitamin D3. However, since the D3 it contains is a very slight amount, and because it is in the "proper" ratio in relation to the vitamin A, I feel comfortable using it once a month (possibly twice depending on the chameleon's age, lighting, etc.). With pre-gravid and gravid female montanes, I felt like giving the female a single drop of human preformed A via a liquid geltab on a single feeder once a month was partly responsible in producing strong neonates. Since I feel it might be better to provide smaller amounts of preformed A more frequently (via the Reptivite formula without D3) than a larger amount once a month (a drop of the gel tab), I've been testing the Reptivite (no D3) on some of my chameleons by giving it twice a month (depending on the age, sex, etc.)
Perry