In Germany, people talk about getting jobs with the help of ‘Vitamin B’, and it’s believed to be one of the best ways to get a job. Through networking and building personal relationships. And although I’ve heard English speakers in Germany talking about getting a job with the help of ‘vitamin C’, I’ve never heard anyone use this term in England.
However, we do have a saying: “It’s not what you know, it’s who you know”.
Read Deutsche Welle’s very short article about this topic.