I totally understand the desire to find something natural. I think that's up to each individual person. However, generally speaking I don't think there's any major risk to using regular lotions and shampoos as one continues their nursing relationship. I wouldn't slather it on my nipples, but who does that anyway?

I think it's fine to use regular lotions on your body, including your breasts. I do know you aren't supposed to use acne treatments with salicylic acid in them while pregnant.
I hear what you are saying about wanting to use natural products. It makes total sense. I just wanted to put this out there in case anybody reads this down the line and worries that their regular lotion may not be ok.