I let others make the nutritional claims, so here is a layman's descriptipon of micro herbs and their benefits.
For those looking for more:
"In general, microgreens contain considerably higher concentrations of vitamins and carotenoids than their mature plant counterparts, although large variations* were found among the 25 species tested. Maximum values of vitamin C, viamin K1, and vitamin E were found in red cabbage, garnet amaranth, and green daikon radish microgreens, respectively. In terms of carotenoids, cilantro microgreens showed the highest concentration of lutein/zeaxanthin and violaxanthin and ranked second in β-carotene concentration."
*This largely refers to the two microgreens grown without light.
- Lester, Gene & Xiao, Zhenlei & Luo, Yaguang & Wang, Qin. (2013). Microgreens: Assessment of Nutrient Concentrations. Journal of Agricultural and Food Chemistry.
Here's a more recent paper, that I don't have access to, but seems to say similar things: