there is nothing wrong with repcal plain calcium, it is the same as any other reptile calcium. the problem i have with repcal with D3, is that it is just too strong (400,000 iu/kg). it is just too concentrated to deliver an appropriate dose. i prefer lower dosage products, compared to repashy calcium with med. D3 (50,000 iu/kg) it is 8x stronger, compared with repashy with lo-D3 (20,000 iu/kg) it is 20x stronger, compared to sticky tongue farms miner-all with D3 indoor formula it is almost 91x stronger. so your regimen would be entirely different depending on which one you use. jmo