Hi M.,
We recommend Hero Nutritionals, Yummi Bears and Yummi Blasts, over Juice Plus for gummy vitamins. Go to their website and take a look. Rainbow Light has the best chewable multi vitamin for kids, Multi-Stars or Nutra-Stars. Break one in half for your two year old. In addition, Nordic Naturals has the best DHA product for kids, DHA Children's Chewables. It is a really tiny capsule that kids can just slide down or chew (has lemon flavor). A couple a day would be good, along with a multi - if you can get the Vit C in him this would be very helpful since he is in daycare.
There are lots of ways to get some nutritious food into your son. Keep trying. All parents struggle with the changing tastes of toddlers. They do have more taste buds so flavors are more pronounced to them. If you want to know more, order our book, Are Your Kids Running on Empty? - amazon, barnes and noble sites.
Let us know what you find that works for you.
... for the health of families,
E. briggs