If that's in a wet area, nothing will prevent mold from growing in the crevices.

Loctite 2in1 Seal and Bond Tub and Tile sealant. In the red tube. This is the old Polyseamseal sealant that is mold/ mildew resistant. I got around 5 years mildew free out of it in a challenging environment. Supposed to be the best product around, per Terry Love.

Mold 'resistant' is the best you can do. Tub and Tile products have additives to keep mold/ mildew at bay. The additives leach out/ give out over time. Then you have to dig the caulking out and replace. Which I've needed to do in the shower but haven't. (Along the way, I've learned that quaternary disinfectants do a lot better job of keeping mold/ mildew controlled than chlorine bleach does. Treat with the quat/ don't expect instant results.)