100g of GR1 rice is needed to feed one kid, So 2000 kg rice need would provide the same amount of beta-carotine/Vitamin A. Just for Vitamin A point-of-view, I fail to see how is it financially reasonable to choose GR1 over lab-quality Vitamin A for $54 per kg.
You mean whether it is biologically available? I guess, the synthesis has been out there since the 1940s, and other procedures has been found in the 1970s: https://community.dur.ac.uk/i.r.baxendale/papers/Tet2016.72.... Because these procedures are still in use, my hunch is that they are in use in vain.
100g of GR1 rice is needed to feed one kid, So 2000 kg rice need would provide the same amount of beta-carotine/Vitamin A. Just for Vitamin A point-of-view, I fail to see how is it financially reasonable to choose GR1 over lab-quality Vitamin A for $54 per kg.