[seiji]

GNC used to have (still has?) two entirely different wrappers on their store-brand protein shakes. One bottle proclaimed "lose weight! get lean!" (light colors, blue/white) and the other boasted "build muscle! grow bigger!" (dark colors, red/black). The contents of both bottles was exactly the same. They were exactly the same price. One was just marketed to women and the other to men.

[jakobbuis]

And the claims are identical, it's only the wording that differs. Compare it to pink and blue toothbrushes.