Does vit d have lots of benefits? What?

Yes. Multiple- immynity-prevention of colds, cancers, control of chronique con.-diabetes, asthma, brain/emotional problems, falls, ... I advise cod liver oil capsules for naturally occurring vit a-about 3, 000 iu and vit d-400 iu a day ( from vitamin shops).My experience shows that taking vitamins from natural sources/from your food) is so much better-better effect at much lower doses and no side effects.
Yes. Vit d helps alkalize body, removes aches and pain, primes cells with vit a so thyroid hormones can work, modulates 2000 enzymes for the body, prevents cancer, needs vit k(as k2) to get into body and need gall bladder in working condition to be absorbed.