[Retric]

People do still get scurvy simply by mostly eating cooked foods. It's still rare, but not that uncommon among collage students.

The sad thing is while vitamin deficiency is actually fairly common it's often a slow process and the body can cope fairly well so it's less noticeable.

[illuminate]

Vitamin deficiency to the point of ill health effects is not "fairly common".

The persons who claim this are usually trying to push nutraceuticals at the same time.

[Retric]

By common I mean it's something that your average General practitioner doctor will encounter. Pregnant and Nursing mothers are often told to take supplements with good reason. Also of note absorption issues are just as important as diet which is one of the reason B12 shots for example are used to treat deficiency.

With that said, taking a daily multivitamin is often overkill taking it weekly is often just as useful. It's just that they are cheap enough that trying to figure out the ideal dose is generally a waste of time.

[illuminate]

"By common I mean it's something that your average General practitioner doctor will encounter"

Well, sure, but that's during specific cases where the person knows that there's something wrong with them. It's not commonly "accidentally" discovered during the course of your regular physicals.