Don't use a vitamin A supplement in tandem with a calcium plus Repashy product. There is no need to. Repashy calcium plus has preformed Vitamin A in it in small doses so it is perfectly fine to give to your Jackson about 2 times a week though I stay more towards once a week (but my Jackson is severely sensitive to any over supplementation, even for a montane species XD). You should be totally fine with the LoD product and I'd start twice a week. If he gets a small gular edema what you need to do is not give any supplements for a few weeks to a month and give showers a few times a week to help flush his system. When you starting supplementing again afterward you should cut back to once week. However I would try twice a week more, I would worry more about not giving enough and having to deal with the possible fall out of that. The beginnings of gular edema if you catch it earl are fairly easy to deal with.