das Vitamin
vitamin
An organic compound that the body needs for vital functions but cannot produce itself, or can produce only in insufficient quantities.
Orangen enthalten viel Vitamin C.
Oranges contain a lot of vitamin C.

vitamin
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vitamin
An organic compound that the body needs for vital functions but cannot produce itself, or can produce only in insufficient quantities.
Orangen enthalten viel Vitamin C.
Oranges contain a lot of vitamin C.

The colloquial meaning exists only in the fixed expression 'Vitamin B'. Any other combination with a letter (Vitamin C, D, A) or the word on its own always refers to the biological substance.
Im Winter nehme ich zusätzlich Vitamin D.
In winter I take extra vitamin D.
In the biological sense, 'Vitamin' (vitamin) is often used with verbs such as 'enthalten' (to contain) or 'brauchen' (to need). The combination 'reich an Vitaminen' (rich in vitamins) is also very common.
Dieses Gemüse enthält viele wichtige Vitamine.
This vegetable contains many important vitamins.
The expression 'Vitamin B' is a fixed expression. The 'B' stands for 'Beziehungen' (relationships/connections). It describes the advantage you get through personal contacts.
Ohne Vitamin B ist es schwer, in dieser Branche eine Stelle zu finden.
Without connections, it is hard to find a job in this industry.
The expression 'Vitamin B' belongs to colloquial language. In formal situations or in a job interview, you would not use this expression.
Er hat die Wohnung nur durch Vitamin B bekommen, das ist doch klar.
He only got the apartment through connections, that's obvious.
contact
'der Kontakt' and 'das Vitamin' are connected here only in the fixed expression 'Vitamin B'. 'Kontakt' means a connection to people or also a person who can help. 'Vitamin B' is colloquial and means that someone gains an advantage through relationships, especially at work. The words can be confused because the 'B' here stands for 'Beziehung' (relationship) and not for a real vitamin. In neutral situations, it is better to say 'Kontakt' or 'Kontakte'. 'Vitamin B' sounds more informal and can also be meant critically.

Clara hat die Stelle nicht nur wegen ihrer Noten bekommen, sondern auch durch Vitamin B.
Clara got the position not only because of her grades, but also through connections.
Durch einen alten Kontakt bekam Mehmet ein Gespräch bei der Firma.
Through an old contact, Mehmet got an interview at the company.