Zinc to prevent stretch marks.

In 1987 when I first started juicing I read an article about stretch marks. I would rather have skinny arms than big muscles with stretch marks. The article was by a BB obstetrician who wondered why no research was done on stretch marks. He found no one cared because "only BB and pregnant women get them". So he started researching and found that zinc could prevent them. He started putting his patients on 30-50mg of zinc (picolinate, I think) a day and NONE of them got stretch marks!
So I started taking 30mg of zinc and as I went from 145lbs to up to 220lbs and I have NO visible stretch marks. I am sure plenty of this is genetics but anything that might help is welcomed.