proxychains ng (new generation) - a preloader which hooks calls to sockets in dynamically linked programs and redirects it through one or more socks/http proxies. continuation of the unmaintained proxychains project. the sf.net page is currently not updated, use releases from github release page instead.
use -q command line option. if the proxified program clears environment variables, there's nothing you can do except commenting out the lines printing the output in the proxychains-ng source code.
Sometimes this information can disrupt the output format and affect reading the log.