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Believe it or not something that I used for years for leather holsters is Doc Martin Wonderbalm. Yes the stuff you put on shoes. For example a lot of leather holsters (especially production leather like Galco, DeSantis, Hume,etc) tend to be kinda rough inside and accelerate wear on a gun. I personally noticed this. Applying this stuff softens and smooths the leather. It doesnt take much. Just rub into the leather and you are good to go. It also did not soften up the holster to cause it to lose its rigidness.

Thats what I use and its worked great.

Oh I was in a gun store in Ft. Worth a long while back and a sales guy told be to use Vaseline to smooth and soften a leather holster. Thats bad advice as that will break down leather.