As for all the claims of better absorption there is no evidence to back this claim. But there are some safety concerns, especially from the orotic acid. Read this over, especially the part on human studies:
Here is an interesting point as well. Why is it that cow's milk is rich in orotic acid yet cow's milk is a poor source of calcium? In fact milk consumption can lead to bone loss. The US is the biggest milk consumer in the world and has the highest osteoporosis rate. Finland is the second highest milk consumer and has the second highest osteoporosis rate in the world. If orotic acid was so effective in increasing calcium absorption then milk would make a great absorbable source of calcium. Instead the opposite is true.