Yes, as this product has D3 in it, no need for another one. Of course you need to also consider what you are gutloading with and what types of feeder prey you are using, but generally speaking, Plain calcium most days, your repton once a week or so.
Potato is not a great gutloading item BTW.
i'm going to pop to my local wholefoods store and see if i can grab some dry gutload ingredients.
in accordance with this supplement, what fresh food gut-load would you recommend?