I have been using RepCal for nearly 16 years, and never had a problem. BTW, my vet (President of the ARAV) says he has never seen a case of hypervitaminosis D3 in a leopard gecko. Just sayin'...
I use RepCal w/D3 for growing babies and laying females. I use w/out D3 in the mealworms bowls, and Herptivite + RepCal w/D3 when I dust crickets and dubia.
I have always used Repcal products as well and never had a problem. I do however use a UVB bulb and only give Repcal wD once a week. Plain calcium 2times a week. Just curious, where did you read that at? Did it specifically state Repcal?