Bogus claims:

1. Spend a couple of minutes outside and you will be OK.

2. It is absorbed through the eyes.

3. Deficiencies are rare.

When in fact:

1. Does not apply at any time when your body is covered up mostly. Wear trousers and a T-shirt and you've cut yourself off severely already. Add weather with less sun, sunscreen, and/or more clothes and you've cut yourself off almost entirely unless you are outside for very long periods of time.

2. Fuck no.

3. They are extremely common even in sunny places. In the developed world a majority of people are.