These are plants that have already assimilated inorganic minerals from rocks and soils. Through photosynthesis, the plants have converted these minerals into organic colloidals which are easily absorbable. Colloidals are miscroscopic sized electrically charged particles. Colloidals act like a magnet, helping to pull broken down cells into the bloodstream to be eliminated. Meanwhile the body is replenished with nourishing life enriching minerals.
Many minerals also require other minerals to be utilized fully in the body.
Vitamins just don't work if you lack the necessary minerals your body needs. That was over 60 years ago. It's worse now. So, if you're not supplementing with minerals, your body is starved and craving these. It will tell you so sooner or later with various ailments.