In the current Issue of Reader's Digest, they did a review of Gizmo's sold on TV.
One of these gizmo's was the "Natural Bra" which is supposed to enhance cleavage.
However, they give this gizmo the lowest rating of all and call it a "total bust". In other words its does not fulfill its promises.
The Bad News:
Readers Digest makes no comment about the (lack of) necessity for such a device.
I have always suspected that magazine's advertisers have much to do with magazine's editorial policies.
I recall back in the mid-70s when jogging was the big craze, jogging magazines advise that bras were unnecessary for women joggers. Then companies began making and advertising "sports bras" in the magazine, and suddenly the magazine's advice changed 180° to how important it was to have "proper support" when jogging.