Call me an old curmudgeon but I have an inherent suspicion of supplements and their related magical powers. It’s always difficult to separate out a positive effect from a “return to norm” or a placebo or something else (I was interested to read that placebos work even if you know they’re placebos; weird, eh?)
This doesn’t mean that I don’t dabble however. Living in the Frozen North, I’ve been taking Vitamin D supplements this winter, even though medical opinion is very divided between whether they provide a genuine benefit or just produce expensive urine.
I take the view that Vitamin D (and pycnogenol, probably) is pretty cheap and, as long as it doesn’t do any harm, then why not?