Microgreens are young edible plants generally harvested after cotyledons expand and around the appearance of the first true leaves. Their species, cultivar, maturity, light, water, medium, handling, and analytical basis affect composition. Some studies report high concentrations of selected vitamins, minerals, pigments, phenolics, or glucosinolates, but microgreens are not nutritionally identical and concentration per 100 grams does not equal the effect of a typical serving.
Human evidence remains much smaller than food-composition evidence. This book therefore separates crop science, laboratory assays, short-term human feasibility, and proven clinical outcomes. It also gives food safety equal status with nutrition. The goal is a safe home-growing and learning system, not a domestic treatment program.