Vitamin A deficiency is a very serious problem. Over $100 million has been spent developing golden rice. Golden rice is not ready for the market. The International Rice Research Institute, just a few weeks ago, published a statement to clarify and make sure it's understood that golden rice is at least two years away from any possible approval. The data is not in that the vitamin A is metabolized—
On March 7th, 2013. See this statement in context.