Well the first thing I should tell you is that, as a Nationally Certified Pharmacy Technician, I can tell you, it is not a good idea to store medications/vitamins in the bathroom. The bathroom is the one room in the home that sees the most drastic changes in humidity and temp. Those changes can and do, contribute to the accelerated deterioration of the medications/vitamins. This deterioration of the meds/vits can change the medication on a molecular level. Now are you gonna die if you keep your meds in the bathroom?, No, of course not. But if you store them elsewhere, then you can protect the integrity of your meds/vits. After all, they are not cheap these days.
As far as storage solutions go, I tend to favor pretty wicker table top baskets to store my vitamins in. I have large bottles to deal with and I find that using the baskets really works well.

I keep my vitamins in the kitchen, in a bread box on the counter. The bread box corrals all the bottles nicely.

My vitamins are in bins in the pantry. My pain relievers are in a drawer in the guest bathroom (it's more centrally located than the master bath). My prescription is on my nightstand.

Wow, this one stumped me. First of all I think you should not *have to* hide your meds or vitamins, but sometimes (especially if I'm using sleeping pills) I don't want people snooping. Do you have a lower kitchen cabinet? Sometimes there are large trays where you can just load them up and store them in one place under the sink. I don't know any guest who would look there.

I bought one of these from Crate&Barrel and keep a small number of vitamins in it on my microwave shelf.

Mine have half a shelf in my pantry closet, with one of those stair-step organizers.

I keep them in the containers they came in, stored in a drawer at work. I take them with breakfast and coffee in the morning; it's automatic.

As long as I hide the more personal supplements for depression & cholesterol behind the generic "I don't have any actual problems" stuff like vitamin C and calcium, I feel covered!

I can see wanting to hide some of the meds but the vitamins?

I keep most of meds/vitamins in my pantry, it's shoved in the back behind a cookie jar (not hiding, just for space). I organize my pantry so there is room to easily slide front items to the left or right to access stuff behind. I also keep some vitamins/probiotics on my desk at work since I'm there so much. I do tend to cart around one of those containers with compartments for each day of the week in my purse (& no I'm not 70 years old ....) If I was embrassed about something, I'd probably tuck it away in my nightstand drawer.

I have a wine rack that's built into my kitchen cabinets and I store my vitamins there. It's right by the sink so it helps me remember them and they're out of the way enough and surrounded by wine bottles that guests don't notice them. I keep my personal medications in my nightstand by my bed. You could put them in a decorative container or box to keep on the counter. Then, when you know you're having guests over, just put it in a cabinet. If someone is rude enough to open a cabinet in your home and then start going through random boxes I'd reconsider if I wanted that person visiting.

I have a really cute square container that I actually picked up from the dollar store. I take like vitamins from 10 different pill bottles, and what I love about this container, is it's big enough to hold all my vitamins but only takes a small bit of room in the cupboard! Because I so easily get confused as to what I take, I take out the pill bottles one at a time, remove the pill, swallow it and sit it on the counter. I keep doing that until I'm done and then I load them all back into the basket. Easy, convenient, and cute!