Is there a vitamin with omega 3 and vitamin d in it?

Omega 3s are essential fatty acids and are known to benefit health in a number of ways. Heart health experts recommend omega 3 supplements for those with high cholesterol/triglyceride levels. Experts...

Too much such as from some multivitamins or from cod liver oil, possibly can. vitamindcouncil.org/news-archive/2008/proper-vitamin-dvitamin-a-ratio/

There are two basic types of vitamin D: Ergosterol is the basic building block of vitamin D in plants. Cholesterol is the basic building block of vitamin D in humans.

Yes, why else would it be called vitamin D if not?

Vitamin D3 is a type of Vitamin D found in animals (including Humans). Vitamin D2 is the type of Vitamin D found in plants.