So how much "would" be effective?? I'm afraid the number "150 nanomoles per liter" doesn't really convey the needed info.
The prescription is relatively inexpensive, less than $20 for three months.
My dermatologist said you get enough vitamins from the sun by walking around the block on a sunny day (best later in the day, after 4 or even 6 or so, depending on its intensity).
You don’t need to bathe in the sun to get the vitamins.