"Vitamin M" is a term that has been used to describe money or currency. Some synonyms that can be used instead of "vitamin M" include cash, dough, bread, currency, greenbacks, bucks, moola, loot, scratch, and funds. These words are commonly used in informal or slang settings when referring to money, and they help to add a bit of humor or playfulness to the conversation. They are also useful in helping to avoid repetition or monotony in language and can provide a means of expressing oneself in a more creative way. Overall, using alternative synonyms for "vitamin M" can make language more interesting and fun.