Hi all, help with a question please?

I've been retaining water, and was advised to get potassium suppliment. I bought one today from a pharmacy after searching for a couple of days for one that doesn't contain lactose or fructose or sugar of any kind. It seems its really hard to buy such a creature in Australia. They all seems to have at least lactose.

I bought some in the end from a pharmacy. The chemist told me they had no sugar, but he wasn't sure about lactose. There is no label, so i'm nervous.

Exactly how much damage would taking a vitamin that might contain some no-no's do? I imagine the quantity would have to be pretty small if it is there. Should I take the risk? I did take some this morning and they do seem to be helping with the fluid output

Thanks
Kim