What are the stereochemical consequences of reducing carbonyls?

The stereochemical consequences of reducing carbonyls would be attacking nucleophiles/reducing agents can attack from either the R or SI face due to carbonyls having a sp2 nature.

In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom: C=O. It is common to several classes of organic compounds, as part of many larger functional groups.