Unfortunately, no, they don't help prevent stretch marks. (momtricks.com)
It is meant to be used by pregnant women, body builders, and gym - goers; anyone who needs help preventing stretch marks as their skin grows. (sweetmomsblog.com)
I applied it liberally to my belly (Shea butter helps prevent stretch marks during pregnancy) and found that it left my skin soft and supple. (thefashionablehousewife.com)