nan 1 is more physiologic than lactogen 1 as it has whey protein which is the same as in uman breast mik.
at the same time lactogen 1 is more sweeter as compared to nan 1.
if your baby accepts feeds well with lactogen 1 then its better to continue with lactogen 1.
is not much severe with it.
only if your baby does not feed well with lactogen 1 then plan to change it back to nan 1.
frequent change in infant formulas is not adviced.