I recently started this game, but I got some followers with high int churning out Stimpaks and RadAways, but they seem to cap at 15. Is there a way I can raise this cap? Upgrading the MedBay or Science Lab doesn't seem to do it.

I'd read http://www.gamesas.com/topic/1521786-enhanced-vault-dwellers-survival-guide/. Now if you can confirm that upgrading does not increase the storage then more then likely the quantity controls it. Meaning that you have to have larger, or more medical bays. Let me know what you discover. I have a double wide Medical Bay and it says http://i.imgur.com/p9Yp7CN.jpg, however my max is 25. I don't know where the 5 comes from.

The storage room tab of the in-app 'Help' guide says 'Building more medbays and Science labs will increase the number of stimpacks and radaways you can store'.

the "5" is probably the baseline maximum, if you had no medbays at all, your limit would be 5.

each square you build a medbay on, increases that limit by 10. so if you built 10 medbay squares, you could hold 105...not sure why you would need that many...