I decided to give this a try after realising the P on my face was getting really bad. I bought some vitamin d3 in the gel form (oil). 1000iu per capsule.
The ingredients in it are: gelatin (the capsule), glycerin (I guess to hold the d3 better?), and corn oil (for digestion?).
For the past two days, I've been pricking a capsule with a neeedle and apply it to the spots on my face twice a day. Afterwards, I would put some vaseline (petroleum jelly) to cover the oil and make sure my skin absorbs it. Within the first day, I noticed skin was smooth, barely any cracking. Today, I woke up and noticed some spots were breaking up with clear skin in between. It's very small improvement so far, but I'm hoping this really works!