Light therapy and contrarian endocrinology is the future. People don't become short on minerals, their life style makes them loose or retain certain minerals.
This is why light therapy works. It affects the mineral retention. Red Light therapy chelates copper since it increases adrenaline. Red light is used in Eck's system to chelate copper. Some people do good on blue light, Some people do good on green light.
Soon a machine will be created where you can get balanced on a daily basis just sleeping with certain light sequences. I am looking into this also. Just imagine, you can get tested, if you are slow oxidizer, more red light sequences, fast oxidizers more blue light sequences. And you are balanced all the time.