One study* suggests that a cream containing vitamin E (amongst other ingredients) was associated with fewer stretch marks during pregnancy. STEAMCREAM contains almond oil that is high in vitamin E. Cocoa butter, is another ingredient in the cream that is a known effective moisturiser linked to reducing stretch marks although there are no clinical tests yet to support this widely regarded claim.
* Mallol, Belda, Costa, Noval, and Sola. (1991). “Prophylaxis of Striaegravidarum with a topical formulation.A double blind trial.” International Journal of Cosmetic Science 13 (13, 51-57): 51.