*bump*
A Dear Doctor distant French cousin sent from Tangier (1953). It's an oversize card, 180x110 mm:

Plasmarine is a mineral supplement, still being sold.

Comparatively dull view considering the red and black ad
EDIT:
The same basic postcard was used on exactly the same date with the same franking to French addressees, for Amora, a maker of mustard and other food items. Of course, it has a different message signed "Amora", so assume the receiver would recognize the name immediately. This product also still exists.