A brief summary from the CO2 Science website:
http://www.co2science.org/articles/V23/oct/a13.php
Published October 30, 2020
Shimomura, M., Yoshida, H.,
Fujiuchi, N., Ariizumi, T. Ezura, H.
and Fukuda, N.
2020
Continuous blue lighting and
elevated carbon dioxide
concentration rapidly increase
chlorogenic acid content
in young lettuce plants.
Scientia Horticulturae 272:
109550, doi.org/10.1016/j.scienta.2020.109550.
Chlorogenic acid (CGA)
is "a strong antioxidant
that potentially reduces
oxidative damage
in human cells."
"elevated CO2 concentration led to
increased lettuce growth with higher
dry matter weight than the control
treatment" (increases up to 68% ..."
" ... as the air's CO2 concentration
rises ... the chlorogenic acid content
of lettuce will increase, producing
more of this effective antioxidant
for human consumption ... "