Lip filler to RESTORE what you had?

I've always liked my lips in terms of their shape and fullness BUT turning 30 I'm noticing I've lost some volume..I actually noticed it around 26. I'm so tempted to get like .5ml just to restore it but the only thing I'm worried about and wouldn't forgive myself for is if it had a negative impact on the shape.

Has anybody tried lip filler just to restore slight volume, no to literally change from thin to plump?