If ingredient X plus Y is patented for a Use, can you patent ingredent X

Heather1

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plus Z for that use and some other s? the other uses were missed, the first set of uses were strictly cosmetic, not life-threatening disease, but the new combination would also work for cosmetic use.
Is this patentable as an improvement
 
it depends on what it is, but it's possible. For pharmaceuticals now, it's how they patent drug combos.
 
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